Merge lp:~ams-codesourcery/gcc-linaro/widening-multiplies-4.6 into lp:gcc-linaro/4.6

[Andrew Stubbs]

Widening multiplies optimizations.

The first commit is not approved yet, but the rest are reviewed upstream, and read to commit.

http://<email address hidden>/msg08720.html

UPDATE: Now with an extra bug-fix.

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-PASS: gcc.c-torture/execute/961213-1.c compilation, -O3 -fomit-frame-pointer
-PASS: gcc.c-torture/execute/961213-1.c compilation, -O3 -fomit-frame-pointer -funroll-all-loops -finline-functions
-PASS: gcc.c-torture/execute/961213-1.c compilation, -O3 -fomit-frame-pointer -funroll-loops
-PASS: gcc.c-torture/execute/961213-1.c compilation, -O3 -g
+FAIL: gcc.c-torture/execute/961213-1.c compilation, -O3 -fomit-frame-pointer -funroll-all-loops -finline-functions (internal compiler error)
+FAIL: gcc.c-torture/execute/961213-1.c compilation, -O3 -fomit-frame-pointer -funroll-loops (internal compiler error)
+FAIL: gcc.c-torture/execute/961213-1.c compilation, -O3 -fomit-frame-pointer (internal compiler error)
+FAIL: gcc.c-torture/execute/961213-1.c compilation, -O3 -g (internal compiler error)
-PASS: gcc.c-torture/execute/961213-1.c execution, -O3 -fomit-frame-pointer
-PASS: gcc.c-torture/execute/961213-1.c execution, -O3 -fomit-frame-pointer -funroll-all-loops -finline-functions
-PASS: gcc.c-torture/execute/961213-1.c execution, -O3 -fomit-frame-pointer -funroll-loops
-PASS: gcc.c-torture/execute/961213-1.c execution, -O3 -g
+UNRESOLVED: gcc.c-torture/execute/961213-1.c execution, -O3 -fomit-frame-pointer
+UNRESOLVED: gcc.c-torture/execute/961213-1.c execution, -O3 -fomit-frame-pointer -funroll-all-loops -finline-functions
+UNRESOLVED: gcc.c-torture/execute/961213-1.c execution, -O3 -fomit-frame-pointer -funroll-loops
+UNRESOLVED: gcc.c-torture/execute/961213-1.c execution, -O3 -g
-PASS: gcc.dg/pr46499-1.c execution test
-PASS: gcc.dg/pr46499-1.c (test for excess errors)
+UNRESOLVED: gcc.dg/pr46499-1.c compilation failed to produce executable
+FAIL: gcc.dg/pr46499-1.c (test for excess errors)
+PASS: gcc.target/arm/no-wmla-1.c scan-assembler mul
+PASS: gcc.target/arm/no-wmla-1.c (test for excess errors)
+PASS: gcc.target/arm/wmul-10.c scan-assembler umlal
+PASS: gcc.target/arm/wmul-10.c (test for excess errors)
+PASS: gcc.target/arm/wmul-11.c scan-assembler smull
+PASS: gcc.target/arm/wmul-11.c (test for excess errors)
+PASS: gcc.target/arm/wmul-12.c scan-assembler smlal
+PASS: gcc.target/arm/wmul-12.c (test for excess errors)
+PASS: gcc.target/arm/wmul-13.c scan-assembler smlal
+PASS: gcc.target/arm/wmul-13.c (test for excess errors)
+PASS: gcc.target/arm/wmul-5.c scan-assembler umlal
+PASS: gcc.target/arm/wmul-5.c (test for excess errors)
+PASS: gcc.target/arm/wmul-6.c scan-assembler smlal
+PASS: gcc.target/arm/wmul-6.c (test for excess errors)
+PASS: gcc.target/arm/wmul-7.c scan-assembler umlal
+PASS: gcc.target/arm/wmul-7.c (test for excess errors)
+PASS: gcc.target/arm/wmul-8.c scan-assembler smlal
+PASS: gcc.target/arm/wmul-8.c (test for excess errors)
+PASS: gcc.target/arm/wmul-9.c scan-assembler smlalbb
+PASS: gcc.target/arm/wmul-9.c (test for excess errors)
+PASS: gcc.target/arm/wmul-bitfield-1.c scan-assembler smlalbb
+PAS...

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The test suite results were not checked.

cbuild-checked: x86_64-natty-cbuild159-oort3-x86_64r1

review: Needs Fixing

[Michael Hope (michaelh1)]

cbuild had trouble building this on x86_64-natty-cbuild159-oort3-x86_64r1.

See the *failed.txt logs under the build results at:
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The test suite results were not checked.

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=== modified file 'ChangeLog.linaro'
--- ChangeLog.linaro	2011-07-21 11:30:53 +0000
+++ ChangeLog.linaro	2011-08-05 14:18:27 +0000
@@ -1,3 +1,4 @@
+<<<<<<< TREE
 2011-07-21  Richard Sandiford  <[e-mail]>
 
 	gcc/
@@ -137,6 +138,134 @@
 
 	* gcc.c-torture/compile/20110401-1.c: New test.
 
+=======
[phone]  Andrew Stubbs  <[e-mail]>
+
+	Backport from patches proposed for 4.7:
+
+	2011-07-22  Andrew Stubbs  <[e-mail]>
+
+	gcc/
+	* tree-ssa-math-opts.c (is_widening_mult_rhs_p): Handle constants
+	beyond conversions.
+	(convert_mult_to_widen): Convert constant inputs to the right type.
+	(convert_plusminus_to_widen): Don't automatically reject inputs that
+	are not an SSA_NAME.
+	Convert constant inputs to the right type.
+
+	gcc/testsuite/
+	* gcc.target/arm/wmul-11.c: New file.
+	* gcc.target/arm/wmul-12.c: New file.
+	* gcc.target/arm/wmul-13.c: New file.
+
+	2011-07-21  Andrew Stubbs  <[e-mail]>
+
+	gcc/
+	* tree-ssa-math-opts.c (convert_plusminus_to_widen): Convert add_rhs
+	to the correct type.
+
+	gcc/testsuite/
+	* gcc.target/arm/wmul-10.c: New file.
+
+	2011-06-24  Andrew Stubbs  <[e-mail]>
+
+	gcc/
+	* tree-ssa-math-opts.c (convert_mult_to_widen): Better handle
+	unsigned inputs of different modes.
+	(convert_plusminus_to_widen): Likewise.
+
+	gcc/testsuite/
+	* gcc.target/arm/wmul-9.c: New file.
+	* gcc.target/arm/wmul-bitfield-2.c: New file.
+
+	2011-07-14  Andrew Stubbs  <[e-mail]>
+
+	gcc/
+	* tree-ssa-math-opts.c (is_widening_mult_rhs_p): Add new argument
+	'type'.
+	Use 'type' from caller, not inferred from 'rhs'.
+	Don't reject non-conversion statements. Do return lhs in this case.
+	(is_widening_mult_p): Add new argument 'type'.
+	Use 'type' from caller, not inferred from 'stmt'.
+	Pass type to is_widening_mult_rhs_p.
+	(convert_mult_to_widen): Pass type to is_widening_mult_p.
+	(convert_plusminus_to_widen): Likewise.
+
+	gcc/testsuite/
+	* gcc.target/arm/wmul-8.c: New file.
+
+	2011-07-14  Andrew Stubbs  <[e-mail]>
+
+	gcc/
+	* tree-ssa-math-opts.c (is_widening_mult_p): Remove FIXME.
+	Ensure the the larger type is the first operand.
+
+	gcc/testsuite/
+	* gcc.target/arm/wmul-7.c: New file.
+
+	2011-07-14  Andrew Stubbs  <[e-mail]>
+
+	gcc/
+	* tree-ssa-math-opts.c (convert_mult_to_widen): Convert
+	unsupported unsigned multiplies to signed.
+	(convert_plusminus_to_widen): Likewise.
+
+	gcc/testsuite/
+	* gcc.target/arm/wmul-6.c: New file.
+
+	2011-07-14  Andrew Stubbs  <[e-mail]>
+
+	gcc/
+	* tree-ssa-math-opts.c (convert_plusminus_to_widen): Permit a single
+	conversion statement separating multiply-and-accumulate.
+
+	gcc/testsuite/
+	* gcc.target/arm/wmul-5.c: New file.
+	* gcc.target/arm/no-wmla-1.c: New file.
+
+	2011-07-27  Andrew Stubbs  <[e-mail]>
+
+	gcc/
+	* config/arm/arm.md (maddhidi4): Remove '*' from name.
+	* expr.c (expand_expr_real_2): Use find_widening_optab_handler.
+	* optabs.c (find_widening_optab_handler_and_mode): New function.
+	(expand_widen_pattern_expr): Use find_widening_optab_handler.
+	(expand_binop_directly): Likewise.
+	(expand_binop): Likewise.
+	* optabs.h (find_widening_optab_handler): New macro define.
+	(find_widening_optab_handler_and_mode): New prototype.
+	* tree-cfg.c (verify_gimple_assign_binary): Adjust WIDEN_MULT_EXPR
+	type precision rules.
+	(verify_gimple_assign_ternary): Likewise for WIDEN_MULT_PLUS_EXPR.
+	* tree-ssa-math-opts.c (build_and_insert_cast): New function.
+	(is_widening_mult_rhs_p): Allow widening by more than one mode.
+	Explicitly disallow mis-matched input types.
+	(convert_mult_to_widen): Use find_widening_optab_handler, and cast
+	input types to fit the new handler.
+	(convert_plusminus_to_widen): Likewise.
+
+	gcc/testsuite/
+	* gcc.target/arm/wmul-bitfield-1.c: New file.
+
+	2011-07-27  Andrew Stubbs  <[e-mail]>
+
+	gcc/
+	* expr.c (expand_expr_real_2): Use widening_optab_handler.
+	* genopinit.c (optabs): Use set_widening_optab_handler for $N.
+	(gen_insn): $N now means $a must be wider than $b, not consecutive.
+	* optabs.c (widened_mode): New function.
+	(expand_widen_pattern_expr): Use widening_optab_handler.
+	(expand_binop_directly): Likewise.
+	(expand_binop): Likewise.
+	* optabs.h (widening_optab_handlers): New struct.
+	(optab_d): New member, 'widening'.
+	(widening_optab_handler): New function.
+	(set_widening_optab_handler): New function.
+	* tree-ssa-math-opts.c (convert_mult_to_widen): Use
+	widening_optab_handler.
+	(convert_plusminus_to_widen): Likewise.
+
+>>>>>>> MERGE-SOURCE
 2011-07-13  Richard Sandiford  <[e-mail]>
 
 	Backport from mainline:

=== modified file 'gcc/config/arm/arm.md'
--- gcc/config/arm/arm.md	2011-06-28 12:02:27 +0000
+++ gcc/config/arm/arm.md	2011-08-05 14:18:27 +0000
@@ -1839,7 +1839,7 @@
    (set_attr "predicable" "yes")]
 )
 
-(define_insn "*maddhidi4"
+(define_insn "maddhidi4"
   [(set (match_operand:DI 0 "s_register_operand" "=r")
 	(plus:DI
 	  (mult:DI (sign_extend:DI

=== modified file 'gcc/expr.c'
--- gcc/expr.c	2011-07-14 11:52:32 +0000
+++ gcc/expr.c	2011-08-05 14:18:27 +0000
@@ -7680,18 +7680,16 @@
 	{
 	  enum machine_mode innermode = TYPE_MODE (TREE_TYPE (treeop0));
 	  this_optab = usmul_widen_optab;
-	  if (mode == GET_MODE_2XWIDER_MODE (innermode))
+	  if (find_widening_optab_handler (this_optab, mode, innermode, 0)
+		!= CODE_FOR_nothing)
 	    {
-	      if (optab_handler (this_optab, mode) != CODE_FOR_nothing)
-		{
-		  if (TYPE_UNSIGNED (TREE_TYPE (treeop0)))
-		    expand_operands (treeop0, treeop1, NULL_RTX, &op0, &op1,
-				     EXPAND_NORMAL);
-		  else
-		    expand_operands (treeop0, treeop1, NULL_RTX, &op1, &op0,
-				     EXPAND_NORMAL);
-		  goto binop3;
-		}
+	      if (TYPE_UNSIGNED (TREE_TYPE (treeop0)))
+		expand_operands (treeop0, treeop1, NULL_RTX, &op0, &op1,
+				 EXPAND_NORMAL);
+	      else
+		expand_operands (treeop0, treeop1, NULL_RTX, &op1, &op0,
+				 EXPAND_NORMAL);
+	      goto binop3;
 	    }
 	}
       /* Check for a multiplication with matching signedness.  */
@@ -7706,10 +7704,10 @@
 	  optab other_optab = zextend_p ? smul_widen_optab : umul_widen_optab;
 	  this_optab = zextend_p ? umul_widen_optab : smul_widen_optab;
 
-	  if (mode == GET_MODE_2XWIDER_MODE (innermode)
-	      && TREE_CODE (treeop0) != INTEGER_CST)
+	  if (TREE_CODE (treeop0) != INTEGER_CST)
 	    {
-	      if (optab_handler (this_optab, mode) != CODE_FOR_nothing)
+	      if (find_widening_optab_handler (this_optab, mode, innermode, 0)
+		    != CODE_FOR_nothing)
 		{
 		  expand_operands (treeop0, treeop1, NULL_RTX, &op0, &op1,
 				   EXPAND_NORMAL);
@@ -7717,7 +7715,8 @@
 					       unsignedp, this_optab);
 		  return REDUCE_BIT_FIELD (temp);
 		}
-	      if (optab_handler (other_optab, mode) != CODE_FOR_nothing
+	      if (find_widening_optab_handler (other_optab, mode, innermode, 0)
+		    != CODE_FOR_nothing
 		  && innermode == word_mode)
 		{
 		  rtx htem, hipart;

=== modified file 'gcc/genopinit.c'
--- gcc/genopinit.c	2011-05-05 15:43:06 +0000
+++ gcc/genopinit.c	2011-08-05 14:18:27 +0000
@@ -46,10 +46,12 @@
    used.  $A and $B are replaced with the full name of the mode; $a and $b
    are replaced with the short form of the name, as above.
 
-   If $N is present in the pattern, it means the two modes must be consecutive
-   widths in the same mode class (e.g, QImode and HImode).  $I means that
-   only full integer modes should be considered for the next mode, and $F
-   means that only float modes should be considered.
+   If $N is present in the pattern, it means the two modes must be in
+   the same mode class, and $b must be greater than $a (e.g, QImode
+   and HImode).
+
+   $I means that only full integer modes should be considered for the
+   next mode, and $F means that only float modes should be considered.
    $P means that both full and partial integer modes should be considered.
    $Q means that only fixed-point modes should be considered.
 
@@ -99,17 +101,17 @@
   "set_optab_handler (smulv_optab, $A, CODE_FOR_$(mulv$I$a3$))",
   "set_optab_handler (umul_highpart_optab, $A, CODE_FOR_$(umul$a3_highpart$))",
   "set_optab_handler (smul_highpart_optab, $A, CODE_FOR_$(smul$a3_highpart$))",
-  "set_optab_handler (smul_widen_optab, $B, CODE_FOR_$(mul$a$b3$)$N)",
-  "set_optab_handler (umul_widen_optab, $B, CODE_FOR_$(umul$a$b3$)$N)",
-  "set_optab_handler (usmul_widen_optab, $B, CODE_FOR_$(usmul$a$b3$)$N)",
-  "set_optab_handler (smadd_widen_optab, $B, CODE_FOR_$(madd$a$b4$)$N)",
-  "set_optab_handler (umadd_widen_optab, $B, CODE_FOR_$(umadd$a$b4$)$N)",
-  "set_optab_handler (ssmadd_widen_optab, $B, CODE_FOR_$(ssmadd$a$b4$)$N)",
-  "set_optab_handler (usmadd_widen_optab, $B, CODE_FOR_$(usmadd$a$b4$)$N)",
-  "set_optab_handler (smsub_widen_optab, $B, CODE_FOR_$(msub$a$b4$)$N)",
-  "set_optab_handler (umsub_widen_optab, $B, CODE_FOR_$(umsub$a$b4$)$N)",
-  "set_optab_handler (ssmsub_widen_optab, $B, CODE_FOR_$(ssmsub$a$b4$)$N)",
-  "set_optab_handler (usmsub_widen_optab, $B, CODE_FOR_$(usmsub$a$b4$)$N)",
+  "set_widening_optab_handler (smul_widen_optab, $B, $A, CODE_FOR_$(mul$a$b3$)$N)",
+  "set_widening_optab_handler (umul_widen_optab, $B, $A, CODE_FOR_$(umul$a$b3$)$N)",
+  "set_widening_optab_handler (usmul_widen_optab, $B, $A, CODE_FOR_$(usmul$a$b3$)$N)",
+  "set_widening_optab_handler (smadd_widen_optab, $B, $A, CODE_FOR_$(madd$a$b4$)$N)",
+  "set_widening_optab_handler (umadd_widen_optab, $B, $A, CODE_FOR_$(umadd$a$b4$)$N)",
+  "set_widening_optab_handler (ssmadd_widen_optab, $B, $A, CODE_FOR_$(ssmadd$a$b4$)$N)",
+  "set_widening_optab_handler (usmadd_widen_optab, $B, $A, CODE_FOR_$(usmadd$a$b4$)$N)",
+  "set_widening_optab_handler (smsub_widen_optab, $B, $A, CODE_FOR_$(msub$a$b4$)$N)",
+  "set_widening_optab_handler (umsub_widen_optab, $B, $A, CODE_FOR_$(umsub$a$b4$)$N)",
+  "set_widening_optab_handler (ssmsub_widen_optab, $B, $A, CODE_FOR_$(ssmsub$a$b4$)$N)",
+  "set_widening_optab_handler (usmsub_widen_optab, $B, $A, CODE_FOR_$(usmsub$a$b4$)$N)",
   "set_optab_handler (sdiv_optab, $A, CODE_FOR_$(div$a3$))",
   "set_optab_handler (ssdiv_optab, $A, CODE_FOR_$(ssdiv$Q$a3$))",
   "set_optab_handler (sdivv_optab, $A, CODE_FOR_$(div$V$I$a3$))",
@@ -304,7 +306,7 @@
     {
       int force_float = 0, force_int = 0, force_partial_int = 0;
       int force_fixed = 0;
-      int force_consec = 0;
+      int force_wider = 0;
       int matches = 1;
 
       for (pp = optabs[pindex]; pp[0] != '$' || pp[1] != '('; pp++)
@@ -322,7 +324,7 @@
 	    switch (*++pp)
 	      {
 	      case 'N':
-		force_consec = 1;
+		force_wider = 1;
 		break;
 	      case 'I':
 		force_int = 1;
@@ -391,7 +393,10 @@
 			    || mode_class[i] == MODE_VECTOR_FRACT
 			    || mode_class[i] == MODE_VECTOR_UFRACT
 			    || mode_class[i] == MODE_VECTOR_ACCUM
-			    || mode_class[i] == MODE_VECTOR_UACCUM))
+			    || mode_class[i] == MODE_VECTOR_UACCUM)
+			&& (! force_wider
+			    || *pp == 'a'
+			    || m1 < i))
 		      break;
 		  }
 
@@ -411,8 +416,7 @@
 	}
 
       if (matches && pp[0] == '$' && pp[1] == ')'
-	  && *np == 0
-	  && (! force_consec || (int) GET_MODE_WIDER_MODE(m1) == m2))
+	  && *np == 0)
 	break;
     }
 

=== modified file 'gcc/optabs.c'
--- gcc/optabs.c	2011-07-04 14:03:49 +0000
+++ gcc/optabs.c	2011-08-05 14:18:27 +0000
@@ -225,6 +225,54 @@
   return 1;
 }
 

+/* Given two input operands, OP0 and OP1, determine what the correct from_mode
+   for a widening operation would be.  In most cases this would be OP0, but if
+   that's a constant it'll be VOIDmode, which isn't useful.  */
+
+static enum machine_mode
+widened_mode (enum machine_mode to_mode, rtx op0, rtx op1)
+{
+  enum machine_mode m0 = GET_MODE (op0);
+  enum machine_mode m1 = GET_MODE (op1);
+  if (m0 == VOIDmode && m1 == VOIDmode)
+    return to_mode;
+  else if (GET_MODE_SIZE (m0) < GET_MODE_SIZE (m1))
+    return m1;
+  else
+    return m0;
+}
+

+/* Find a widening optab even if it doesn't widen as much as we want.
+   E.g. if from_mode is HImode, and to_mode is DImode, and there is no
+   direct HI->SI insn, then return SI->DI, if that exists.
+   If PERMIT_NON_WIDENING is non-zero then this can be used with
+   non-widening optabs also.  */
+
+enum insn_code
+find_widening_optab_handler_and_mode (optab op, enum machine_mode to_mode,
+				      enum machine_mode from_mode,
+				      int permit_non_widening,
+				      enum machine_mode *found_mode)
+{
+  for (; (permit_non_widening || from_mode != to_mode)
+	 && GET_MODE_SIZE (from_mode) <= GET_MODE_SIZE (to_mode)
+	 && from_mode != VOIDmode;
+       from_mode = GET_MODE_WIDER_MODE (from_mode))
+    {
+      enum insn_code handler = widening_optab_handler (op, to_mode,
+						       from_mode);
+
+      if (handler != CODE_FOR_nothing)
+	{
+	  if (found_mode)
+	    *found_mode = from_mode;
+	  return handler;
+	}
+    }
+
+  return CODE_FOR_nothing;
+}
+

 /* Widen OP to MODE and return the rtx for the widened operand.  UNSIGNEDP
    says whether OP is signed or unsigned.  NO_EXTEND is nonzero if we need
    not actually do a sign-extend or zero-extend, but can leave the
@@ -517,8 +565,9 @@
     optab_for_tree_code (ops->code, TREE_TYPE (oprnd0), optab_default);
   if (ops->code == WIDEN_MULT_PLUS_EXPR
       || ops->code == WIDEN_MULT_MINUS_EXPR)
-    icode = (int) optab_handler (widen_pattern_optab,
-				 TYPE_MODE (TREE_TYPE (ops->op2)));
+    icode = (int) find_widening_optab_handler (widen_pattern_optab,
+					       TYPE_MODE (TREE_TYPE (ops->op2)),
+					       tmode0, 0);
   else
     icode = (int) optab_handler (widen_pattern_optab, tmode0);
   gcc_assert (icode != CODE_FOR_nothing);
@@ -1389,7 +1438,9 @@
 		       rtx target, int unsignedp, enum optab_methods methods,
 		       rtx last)
 {
-  int icode = (int) optab_handler (binoptab, mode);
+  enum machine_mode from_mode = widened_mode (mode, op0, op1);
+  int icode = (int) find_widening_optab_handler (binoptab, mode,
+						 from_mode, 1);
   enum machine_mode mode0 = insn_data[icode].operand[1].mode;
   enum machine_mode mode1 = insn_data[icode].operand[2].mode;
   enum machine_mode tmp_mode;
@@ -1546,7 +1597,9 @@
   /* If we can do it with a three-operand insn, do so.  */
 
   if (methods != OPTAB_MUST_WIDEN
-      && optab_handler (binoptab, mode) != CODE_FOR_nothing)
+      && find_widening_optab_handler (binoptab, mode,
+				      widened_mode (mode, op0, op1), 1)
+	    != CODE_FOR_nothing)
     {
       temp = expand_binop_directly (mode, binoptab, op0, op1, target,
 				    unsignedp, methods, last);
@@ -1586,8 +1639,9 @@
 
   if (binoptab == smul_optab
       && GET_MODE_WIDER_MODE (mode) != VOIDmode
-      && (optab_handler ((unsignedp ? umul_widen_optab : smul_widen_optab),
-			 GET_MODE_WIDER_MODE (mode))
+      && (widening_optab_handler ((unsignedp ? umul_widen_optab
+					     : smul_widen_optab),
+				  GET_MODE_WIDER_MODE (mode), mode)
 	  != CODE_FOR_nothing))
     {
       temp = expand_binop (GET_MODE_WIDER_MODE (mode),
@@ -1618,9 +1672,11 @@
 	if (optab_handler (binoptab, wider_mode) != CODE_FOR_nothing
 	    || (binoptab == smul_optab
 		&& GET_MODE_WIDER_MODE (wider_mode) != VOIDmode
-		&& (optab_handler ((unsignedp ? umul_widen_optab
-				    : smul_widen_optab),
-				   GET_MODE_WIDER_MODE (wider_mode))
+		&& (find_widening_optab_handler ((unsignedp
+						  ? umul_widen_optab
+						  : smul_widen_optab),
+						 GET_MODE_WIDER_MODE (wider_mode),
+						 mode, 0)
 		    != CODE_FOR_nothing)))
 	  {
 	    rtx xop0 = op0, xop1 = op1;
@@ -2043,8 +2099,8 @@
       && optab_handler (add_optab, word_mode) != CODE_FOR_nothing)
     {
       rtx product = NULL_RTX;
-
-      if (optab_handler (umul_widen_optab, mode) != CODE_FOR_nothing)
+      if (widening_optab_handler (umul_widen_optab, mode, word_mode)
+	    != CODE_FOR_nothing)
 	{
 	  product = expand_doubleword_mult (mode, op0, op1, target,
 					    true, methods);
@@ -2053,7 +2109,8 @@
 	}
 
       if (product == NULL_RTX
-	  && optab_handler (smul_widen_optab, mode) != CODE_FOR_nothing)
+	  && widening_optab_handler (smul_widen_optab, mode, word_mode)
+		!= CODE_FOR_nothing)
 	{
 	  product = expand_doubleword_mult (mode, op0, op1, target,
 					    false, methods);
@@ -2144,7 +2201,8 @@
 	   wider_mode != VOIDmode;
 	   wider_mode = GET_MODE_WIDER_MODE (wider_mode))
 	{
-	  if (optab_handler (binoptab, wider_mode) != CODE_FOR_nothing
+	  if (find_widening_optab_handler (binoptab, wider_mode, mode, 1)
+		  != CODE_FOR_nothing
 	      || (methods == OPTAB_LIB
 		  && optab_libfunc (binoptab, wider_mode)))
 	    {

=== modified file 'gcc/optabs.h'
--- gcc/optabs.h	2011-05-05 15:43:06 +0000
+++ gcc/optabs.h	2011-08-05 14:18:27 +0000
@@ -42,6 +42,11 @@
   int insn_code;
 };
 
+struct widening_optab_handlers
+{
+  struct optab_handlers handlers[NUM_MACHINE_MODES][NUM_MACHINE_MODES];
+};
+
 struct optab_d
 {
   enum rtx_code code;
@@ -50,6 +55,7 @@
   void (*libcall_gen)(struct optab_d *, const char *name, char suffix,
 		      enum machine_mode);
   struct optab_handlers handlers[NUM_MACHINE_MODES];
+  struct widening_optab_handlers *widening;
 };
 typedef struct optab_d * optab;
 
@@ -799,6 +805,15 @@
 extern void emit_unop_insn (int, rtx, rtx, enum rtx_code);
 extern bool maybe_emit_unop_insn (int, rtx, rtx, enum rtx_code);
 
+/* Find a widening optab even if it doesn't widen as much as we want.  */
+#define find_widening_optab_handler(A,B,C,D) \
+  find_widening_optab_handler_and_mode (A, B, C, D, NULL)
+extern enum insn_code find_widening_optab_handler_and_mode (optab,
+							    enum machine_mode,
+							    enum machine_mode,
+							    int,
+							    enum machine_mode *);
+
 /* An extra flag to control optab_for_tree_code's behavior.  This is needed to
    distinguish between machines with a vector shift that takes a scalar for the
    shift amount vs. machines that take a vector for the shift amount.  */
@@ -874,6 +889,23 @@
 			   + (int) CODE_FOR_nothing);
 }
 
+/* Like optab_handler, but for widening_operations that have a TO_MODE and
+  a FROM_MODE.  */
+
+static inline enum insn_code
+widening_optab_handler (optab op, enum machine_mode to_mode,
+			enum machine_mode from_mode)
+{
+  if (to_mode == from_mode || from_mode == VOIDmode)
+    return optab_handler (op, to_mode);
+
+  if (op->widening)
+    return (enum insn_code) (op->widening->handlers[(int) to_mode][(int) from_mode].insn_code
+			     + (int) CODE_FOR_nothing);
+
+  return CODE_FOR_nothing;
+}
+
 /* Record that insn CODE should be used to implement mode MODE of OP.  */
 
 static inline void
@@ -882,6 +914,26 @@
   op->handlers[(int) mode].insn_code = (int) code - (int) CODE_FOR_nothing;
 }
 
+/* Like set_optab_handler, but for widening operations that have a TO_MODE
+   and a FROM_MODE.  */
+
+static inline void
+set_widening_optab_handler (optab op, enum machine_mode to_mode,
+			    enum machine_mode from_mode, enum insn_code code)
+{
+  if (to_mode == from_mode)
+    set_optab_handler (op, to_mode, code);
+  else
+    {
+      if (op->widening == NULL)
+	op->widening = (struct widening_optab_handlers *)
+	      xcalloc (1, sizeof (struct widening_optab_handlers));
+
+      op->widening->handlers[(int) to_mode][(int) from_mode].insn_code
+	  = (int) code - (int) CODE_FOR_nothing;
+    }
+}
+
 /* Return the insn used to perform conversion OP from mode FROM_MODE
    to mode TO_MODE; return CODE_FOR_nothing if the target does not have
    such an insn.  */

=== added file 'gcc/testsuite/gcc.target/arm/no-wmla-1.c'
--- gcc/testsuite/gcc.target/arm/no-wmla-1.c	1970-01-01 00:00:00 +0000
+++ gcc/testsuite/gcc.target/arm/no-wmla-1.c	2011-08-05 14:18:27 +0000
@@ -0,0 +1,11 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -march=armv7-a" } */
+
+int
+foo (int a, short b, short c)
+{
+     int bc = b * c;
+        return a + (short)bc;
+}
+
+/* { dg-final { scan-assembler "mul" } } */

=== added file 'gcc/testsuite/gcc.target/arm/wmul-10.c'
--- gcc/testsuite/gcc.target/arm/wmul-10.c	1970-01-01 00:00:00 +0000
+++ gcc/testsuite/gcc.target/arm/wmul-10.c	2011-08-05 14:18:27 +0000
@@ -0,0 +1,10 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -march=armv7-a" } */
+
+unsigned long long
+foo (unsigned short a, unsigned short *b, unsigned short *c)
+{
+  return (unsigned)a + (unsigned long long)*b * (unsigned long long)*c;
+}
+
+/* { dg-final { scan-assembler "umlal" } } */

=== added file 'gcc/testsuite/gcc.target/arm/wmul-11.c'
--- gcc/testsuite/gcc.target/arm/wmul-11.c	1970-01-01 00:00:00 +0000
+++ gcc/testsuite/gcc.target/arm/wmul-11.c	2011-08-05 14:18:27 +0000
@@ -0,0 +1,10 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -march=armv7-a" } */
+
+long long
+foo (int *b)
+{
+  return 10 * (long long)*b;
+}
+
+/* { dg-final { scan-assembler "smull" } } */

=== added file 'gcc/testsuite/gcc.target/arm/wmul-12.c'
--- gcc/testsuite/gcc.target/arm/wmul-12.c	1970-01-01 00:00:00 +0000
+++ gcc/testsuite/gcc.target/arm/wmul-12.c	2011-08-05 14:18:27 +0000
@@ -0,0 +1,11 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -march=armv7-a" } */
+
+long long
+foo (int *b, int *c)
+{
+  int tmp = *b * *c;
+  return 10 + (long long)tmp;
+}
+
+/* { dg-final { scan-assembler "smlal" } } */

=== added file 'gcc/testsuite/gcc.target/arm/wmul-13.c'
--- gcc/testsuite/gcc.target/arm/wmul-13.c	1970-01-01 00:00:00 +0000
+++ gcc/testsuite/gcc.target/arm/wmul-13.c	2011-08-05 14:18:27 +0000
@@ -0,0 +1,10 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -march=armv7-a" } */
+
+long long
+foo (int *a, int *b)
+{
+  return *a + (long long)*b * 10;
+}
+
+/* { dg-final { scan-assembler "smlal" } } */

=== added file 'gcc/testsuite/gcc.target/arm/wmul-5.c'
--- gcc/testsuite/gcc.target/arm/wmul-5.c	1970-01-01 00:00:00 +0000
+++ gcc/testsuite/gcc.target/arm/wmul-5.c	2011-08-05 14:18:27 +0000
@@ -0,0 +1,10 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -march=armv7-a" } */
+
+long long
+foo (long long a, char *b, char *c)
+{
+  return a + *b * *c;
+}
+
+/* { dg-final { scan-assembler "umlal" } } */

=== added file 'gcc/testsuite/gcc.target/arm/wmul-6.c'
--- gcc/testsuite/gcc.target/arm/wmul-6.c	1970-01-01 00:00:00 +0000
+++ gcc/testsuite/gcc.target/arm/wmul-6.c	2011-08-05 14:18:27 +0000
@@ -0,0 +1,10 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -march=armv7-a" } */
+
+long long
+foo (long long a, unsigned char *b, signed char *c)
+{
+  return a + (long long)*b * (long long)*c;
+}
+
+/* { dg-final { scan-assembler "smlal" } } */

=== added file 'gcc/testsuite/gcc.target/arm/wmul-7.c'
--- gcc/testsuite/gcc.target/arm/wmul-7.c	1970-01-01 00:00:00 +0000
+++ gcc/testsuite/gcc.target/arm/wmul-7.c	2011-08-05 14:18:27 +0000
@@ -0,0 +1,10 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -march=armv7-a" } */
+
+unsigned long long
+foo (unsigned long long a, unsigned char *b, unsigned short *c)
+{
+  return a + *b * *c;
+}
+
+/* { dg-final { scan-assembler "umlal" } } */

=== added file 'gcc/testsuite/gcc.target/arm/wmul-8.c'
--- gcc/testsuite/gcc.target/arm/wmul-8.c	1970-01-01 00:00:00 +0000
+++ gcc/testsuite/gcc.target/arm/wmul-8.c	2011-08-05 14:18:27 +0000
@@ -0,0 +1,10 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -march=armv7-a" } */
+
+long long
+foo (long long a, int *b, int *c)
+{
+  return a + *b * *c;
+}
+
+/* { dg-final { scan-assembler "smlal" } } */

=== added file 'gcc/testsuite/gcc.target/arm/wmul-9.c'
--- gcc/testsuite/gcc.target/arm/wmul-9.c	1970-01-01 00:00:00 +0000
+++ gcc/testsuite/gcc.target/arm/wmul-9.c	2011-08-05 14:18:27 +0000
@@ -0,0 +1,10 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -march=armv7-a" } */
+
+long long
+foo (long long a, short *b, char *c)
+{
+  return a + *b * *c;
+}
+
+/* { dg-final { scan-assembler "smlalbb" } } */

=== added file 'gcc/testsuite/gcc.target/arm/wmul-bitfield-1.c'
--- gcc/testsuite/gcc.target/arm/wmul-bitfield-1.c	1970-01-01 00:00:00 +0000
+++ gcc/testsuite/gcc.target/arm/wmul-bitfield-1.c	2011-08-05 14:18:27 +0000
@@ -0,0 +1,17 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -march=armv7-a" } */
+
+struct bf
+{
+  int a : 3;
+  int b : 15;
+  int c : 3;
+};
+
+long long
+foo (long long a, struct bf b, struct bf c)
+{
+  return a + b.b * c.b;
+}
+
+/* { dg-final { scan-assembler "smlalbb" } } */

=== added file 'gcc/testsuite/gcc.target/arm/wmul-bitfield-2.c'
--- gcc/testsuite/gcc.target/arm/wmul-bitfield-2.c	1970-01-01 00:00:00 +0000
+++ gcc/testsuite/gcc.target/arm/wmul-bitfield-2.c	2011-08-05 14:18:27 +0000
@@ -0,0 +1,17 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -march=armv7-a" } */
+
+struct bf
+{
+  int a : 3;
+  unsigned int b : 15;
+  int c : 3;
+};
+
+long long
+foo (long long a, struct bf b, struct bf c)
+{
+  return a + b.b * c.c;
+}
+
+/* { dg-final { scan-assembler "smlalbb" } } */

=== modified file 'gcc/tree-cfg.c'
--- gcc/tree-cfg.c	2011-07-01 09:19:21 +0000
+++ gcc/tree-cfg.c	2011-08-05 14:18:27 +0000
@@ -3574,7 +3574,7 @@
     case WIDEN_MULT_EXPR:
       if (TREE_CODE (lhs_type) != INTEGER_TYPE)
 	return true;
-      return ((2 * TYPE_PRECISION (rhs1_type) != TYPE_PRECISION (lhs_type))
+      return ((2 * TYPE_PRECISION (rhs1_type) > TYPE_PRECISION (lhs_type))
 	      || (TYPE_PRECISION (rhs1_type) != TYPE_PRECISION (rhs2_type)));
 
     case WIDEN_SUM_EXPR:
@@ -3667,7 +3667,7 @@
 	   && !FIXED_POINT_TYPE_P (rhs1_type))
 	  || !useless_type_conversion_p (rhs1_type, rhs2_type)
 	  || !useless_type_conversion_p (lhs_type, rhs3_type)
-	  || 2 * TYPE_PRECISION (rhs1_type) != TYPE_PRECISION (lhs_type)
+	  || 2 * TYPE_PRECISION (rhs1_type) > TYPE_PRECISION (lhs_type)
 	  || TYPE_PRECISION (rhs1_type) != TYPE_PRECISION (rhs2_type))
 	{
 	  error ("type mismatch in widening multiply-accumulate expression");

=== modified file 'gcc/tree-ssa-math-opts.c'
--- gcc/tree-ssa-math-opts.c	2011-03-11 16:36:16 +0000
+++ gcc/tree-ssa-math-opts.c	2011-08-05 14:18:27 +0000
@@ -1266,42 +1266,75 @@
  }
 };
 
-/* Return true if RHS is a suitable operand for a widening multiplication.
+/* Build a gimple assignment to cast VAL to TARGET.  Insert the statement
+   prior to GSI's current position, and return the fresh SSA name.  */
+
+static tree
+build_and_insert_cast (gimple_stmt_iterator *gsi, location_t loc,
+		       tree target, tree val)
+{
+  tree result = make_ssa_name (target, NULL);
+  gimple stmt = gimple_build_assign_with_ops (CONVERT_EXPR, result, val, NULL);
+  gimple_set_location (stmt, loc);
+  gsi_insert_before (gsi, stmt, GSI_SAME_STMT);
+  return result;
+}
+
+/* Return true if RHS is a suitable operand for a widening multiplication,
+   assuming a target type of TYPE.
    There are two cases:
 
-     - RHS makes some value twice as wide.  Store that value in *NEW_RHS_OUT
-       if so, and store its type in *TYPE_OUT.
+     - RHS makes some value at least twice as wide.  Store that value
+       in *NEW_RHS_OUT if so, and store its type in *TYPE_OUT.
 
      - RHS is an integer constant.  Store that value in *NEW_RHS_OUT if so,
        but leave *TYPE_OUT untouched.  */
 
 static bool
-is_widening_mult_rhs_p (tree rhs, tree *type_out, tree *new_rhs_out)
+is_widening_mult_rhs_p (tree type, tree rhs, tree *type_out,
+			tree *new_rhs_out)
 {
   gimple stmt;
-  tree type, type1, rhs1;
+  tree type1, rhs1;
   enum tree_code rhs_code;
 
   if (TREE_CODE (rhs) == SSA_NAME)
     {
-      type = TREE_TYPE (rhs);
       stmt = SSA_NAME_DEF_STMT (rhs);
       if (!is_gimple_assign (stmt))
-	return false;
-
-      rhs_code = gimple_assign_rhs_code (stmt);
-      if (TREE_CODE (type) == INTEGER_TYPE
-	  ? !CONVERT_EXPR_CODE_P (rhs_code)
-	  : rhs_code != FIXED_CONVERT_EXPR)
-	return false;
-
-      rhs1 = gimple_assign_rhs1 (stmt);
-      type1 = TREE_TYPE (rhs1);
+	{
+	  rhs1 = NULL;
+	  type1 = TREE_TYPE (rhs);
+	}
+      else
+	{
+	  rhs1 = gimple_assign_rhs1 (stmt);
+	  type1 = TREE_TYPE (rhs1);
+	}
+
+      if (rhs1 && TREE_CODE (rhs1) == INTEGER_CST)
+	{
+	  *new_rhs_out = rhs1;
+	  *type_out = NULL;
+	  return true;
+	}
+
       if (TREE_CODE (type1) != TREE_CODE (type)
-	  || TYPE_PRECISION (type1) * 2 != TYPE_PRECISION (type))
+	  || TYPE_PRECISION (type1) * 2 > TYPE_PRECISION (type))
 	return false;
 
-      *new_rhs_out = rhs1;
+      if (rhs1)
+	{
+	  rhs_code = gimple_assign_rhs_code (stmt);
+	  if (TREE_CODE (type) == INTEGER_TYPE
+	      ? !CONVERT_EXPR_CODE_P (rhs_code)
+	      : rhs_code != FIXED_CONVERT_EXPR)
+	    *new_rhs_out = rhs;
+	  else
+	    *new_rhs_out = rhs1;
+	}
+      else
+	*new_rhs_out = rhs;
       *type_out = type1;
       return true;
     }
@@ -1316,28 +1349,27 @@
   return false;
 }
 
-/* Return true if STMT performs a widening multiplication.  If so,
-   store the unwidened types of the operands in *TYPE1_OUT and *TYPE2_OUT
-   respectively.  Also fill *RHS1_OUT and *RHS2_OUT such that converting
-   those operands to types *TYPE1_OUT and *TYPE2_OUT would give the
-   operands of the multiplication.  */
+/* Return true if STMT performs a widening multiplication, assuming the
+   output type is TYPE.  If so, store the unwidened types of the operands
+   in *TYPE1_OUT and *TYPE2_OUT respectively.  Also fill *RHS1_OUT and
+   *RHS2_OUT such that converting those operands to types *TYPE1_OUT
+   and *TYPE2_OUT would give the operands of the multiplication.  */
 
 static bool
-is_widening_mult_p (gimple stmt,
+is_widening_mult_p (tree type, gimple stmt,
 		    tree *type1_out, tree *rhs1_out,
 		    tree *type2_out, tree *rhs2_out)
 {
-  tree type;
-
-  type = TREE_TYPE (gimple_assign_lhs (stmt));
   if (TREE_CODE (type) != INTEGER_TYPE
       && TREE_CODE (type) != FIXED_POINT_TYPE)
     return false;
 
-  if (!is_widening_mult_rhs_p (gimple_assign_rhs1 (stmt), type1_out, rhs1_out))
+  if (!is_widening_mult_rhs_p (type, gimple_assign_rhs1 (stmt), type1_out,
+			       rhs1_out))
     return false;
 
-  if (!is_widening_mult_rhs_p (gimple_assign_rhs2 (stmt), type2_out, rhs2_out))
+  if (!is_widening_mult_rhs_p (type, gimple_assign_rhs2 (stmt), type2_out,
+			       rhs2_out))
     return false;
 
   if (*type1_out == NULL)
@@ -1354,6 +1386,18 @@
       *type2_out = *type1_out;
     }
 
+  /* Ensure that the larger of the two operands comes first. */
+  if (TYPE_PRECISION (*type1_out) < TYPE_PRECISION (*type2_out))
+    {
+      tree tmp;
+      tmp = *type1_out;
+      *type1_out = *type2_out;
+      *type2_out = tmp;
+      tmp = *rhs1_out;
+      *rhs1_out = *rhs2_out;
+      *rhs2_out = tmp;
+    }
+
   return true;
 }
 
@@ -1362,31 +1406,100 @@
    value is true iff we converted the statement.  */
 
 static bool
-convert_mult_to_widen (gimple stmt)
+convert_mult_to_widen (gimple stmt, gimple_stmt_iterator *gsi)
 {
-  tree lhs, rhs1, rhs2, type, type1, type2;
+  tree lhs, rhs1, rhs2, type, type1, type2, tmp = NULL;
   enum insn_code handler;
+  enum machine_mode to_mode, from_mode, actual_mode;
+  optab op;
+  int actual_precision;
+  location_t loc = gimple_location (stmt);
+  bool from_unsigned1, from_unsigned2;
 
   lhs = gimple_assign_lhs (stmt);
   type = TREE_TYPE (lhs);
   if (TREE_CODE (type) != INTEGER_TYPE)
     return false;
 
-  if (!is_widening_mult_p (stmt, &type1, &rhs1, &type2, &rhs2))
+  if (!is_widening_mult_p (type, stmt, &type1, &rhs1, &type2, &rhs2))
     return false;
 
-  if (TYPE_UNSIGNED (type1) && TYPE_UNSIGNED (type2))
-    handler = optab_handler (umul_widen_optab, TYPE_MODE (type));
-  else if (!TYPE_UNSIGNED (type1) && !TYPE_UNSIGNED (type2))
-    handler = optab_handler (smul_widen_optab, TYPE_MODE (type));
+  to_mode = TYPE_MODE (type);
+  from_mode = TYPE_MODE (type1);
+  from_unsigned1 = TYPE_UNSIGNED (type1);
+  from_unsigned2 = TYPE_UNSIGNED (type2);
+
+  if (from_unsigned1 && from_unsigned2)
+    op = umul_widen_optab;
+  else if (!from_unsigned1 && !from_unsigned2)
+    op = smul_widen_optab;
   else
-    handler = optab_handler (usmul_widen_optab, TYPE_MODE (type));
+    op = usmul_widen_optab;
+
+  handler = find_widening_optab_handler_and_mode (op, to_mode, from_mode,
+						  0, &actual_mode);
 
   if (handler == CODE_FOR_nothing)
-    return false;
-
-  gimple_assign_set_rhs1 (stmt, fold_convert (type1, rhs1));
-  gimple_assign_set_rhs2 (stmt, fold_convert (type2, rhs2));
+    {
+      if (op != smul_widen_optab)
+	{
+	  /* We can use a signed multiply with unsigned types as long as
+	     there is a wider mode to use, or it is the smaller of the two
+	     types that is unsigned.  Note that type1 >= type2, always.  */
+	  if ((TYPE_UNSIGNED (type1)
+	       && TYPE_PRECISION (type1) == GET_MODE_PRECISION (from_mode))
+	      || (TYPE_UNSIGNED (type2)
+		  && TYPE_PRECISION (type2) == GET_MODE_PRECISION (from_mode)))
+	    {
+	      from_mode = GET_MODE_WIDER_MODE (from_mode);
+	      if (GET_MODE_SIZE (to_mode) <= GET_MODE_SIZE (from_mode))
+		return false;
+	    }
+
+	  op = smul_widen_optab;
+	  handler = find_widening_optab_handler_and_mode (op, to_mode,
+							  from_mode, 0,
+							  &actual_mode);
+
+	  if (handler == CODE_FOR_nothing)
+	    return false;
+
+	  from_unsigned1 = from_unsigned2 = false;
+	}
+      else
+	return false;
+    }
+
+  /* Ensure that the inputs to the handler are in the correct precison
+     for the opcode.  This will be the full mode size.  */
+  actual_precision = GET_MODE_PRECISION (actual_mode);
+  if (actual_precision != TYPE_PRECISION (type1)
+      || from_unsigned1 != TYPE_UNSIGNED (type1))
+    {
+      tmp = create_tmp_var (build_nonstandard_integer_type
+				(actual_precision, from_unsigned1),
+			    NULL);
+      rhs1 = build_and_insert_cast (gsi, loc, tmp, rhs1);
+    }
+  if (actual_precision != TYPE_PRECISION (type2)
+      || from_unsigned2 != TYPE_UNSIGNED (type2))
+    {
+      /* Reuse the same type info, if possible.  */
+      if (!tmp || from_unsigned1 != from_unsigned2)
+	tmp = create_tmp_var (build_nonstandard_integer_type
+				(actual_precision, from_unsigned2),
+			      NULL);
+      rhs2 = build_and_insert_cast (gsi, loc, tmp, rhs2);
+    }
+
+  /* Handle constants.  */
+  if (TREE_CODE (rhs1) == INTEGER_CST)
+    rhs1 = fold_convert (type1, rhs1);
+  if (TREE_CODE (rhs2) == INTEGER_CST)
+    rhs2 = fold_convert (type2, rhs2);
+
+  gimple_assign_set_rhs1 (stmt, rhs1);
+  gimple_assign_set_rhs2 (stmt, rhs2);
   gimple_assign_set_rhs_code (stmt, WIDEN_MULT_EXPR);
   update_stmt (stmt);
   return true;
@@ -1403,11 +1516,17 @@
 			    enum tree_code code)
 {
   gimple rhs1_stmt = NULL, rhs2_stmt = NULL;
-  tree type, type1, type2;
+  gimple conv1_stmt = NULL, conv2_stmt = NULL, conv_stmt;
+  tree type, type1, type2, optype, tmp = NULL;
   tree lhs, rhs1, rhs2, mult_rhs1, mult_rhs2, add_rhs;
   enum tree_code rhs1_code = ERROR_MARK, rhs2_code = ERROR_MARK;
   optab this_optab;
   enum tree_code wmult_code;
+  enum insn_code handler;
+  enum machine_mode to_mode, from_mode, actual_mode;
+  location_t loc = gimple_location (stmt);
+  int actual_precision;
+  bool from_unsigned1, from_unsigned2;
 
   lhs = gimple_assign_lhs (stmt);
   type = TREE_TYPE (lhs);
@@ -1429,8 +1548,6 @@
       if (is_gimple_assign (rhs1_stmt))
 	rhs1_code = gimple_assign_rhs_code (rhs1_stmt);
     }
-  else
-    return false;
 
   if (TREE_CODE (rhs2) == SSA_NAME)
     {
@@ -1438,57 +1555,160 @@
       if (is_gimple_assign (rhs2_stmt))
 	rhs2_code = gimple_assign_rhs_code (rhs2_stmt);
     }
-  else
-    return false;
-
-  if (code == PLUS_EXPR && rhs1_code == MULT_EXPR)
-    {
-      if (!is_widening_mult_p (rhs1_stmt, &type1, &mult_rhs1,
-			       &type2, &mult_rhs2))
-	return false;
-      add_rhs = rhs2;
-    }
-  else if (rhs2_code == MULT_EXPR)
-    {
-      if (!is_widening_mult_p (rhs2_stmt, &type1, &mult_rhs1,
-			       &type2, &mult_rhs2))
-	return false;
-      add_rhs = rhs1;
-    }
-  else if (code == PLUS_EXPR && rhs1_code == WIDEN_MULT_EXPR)
-    {
-      mult_rhs1 = gimple_assign_rhs1 (rhs1_stmt);
-      mult_rhs2 = gimple_assign_rhs2 (rhs1_stmt);
-      type1 = TREE_TYPE (mult_rhs1);
-      type2 = TREE_TYPE (mult_rhs2);
-      add_rhs = rhs2;
-    }
-  else if (rhs2_code == WIDEN_MULT_EXPR)
-    {
-      mult_rhs1 = gimple_assign_rhs1 (rhs2_stmt);
-      mult_rhs2 = gimple_assign_rhs2 (rhs2_stmt);
-      type1 = TREE_TYPE (mult_rhs1);
-      type2 = TREE_TYPE (mult_rhs2);
-      add_rhs = rhs1;
-    }
-  else
-    return false;
-
-  if (TYPE_UNSIGNED (type1) != TYPE_UNSIGNED (type2))
-    return false;
+
+  /* Allow for one conversion statement between the multiply
+     and addition/subtraction statement.  If there are more than
+     one conversions then we assume they would invalidate this
+     transformation.  If that's not the case then they should have
+     been folded before now.  */
+  if (CONVERT_EXPR_CODE_P (rhs1_code))
+    {
+      conv1_stmt = rhs1_stmt;
+      rhs1 = gimple_assign_rhs1 (rhs1_stmt);
+      if (TREE_CODE (rhs1) == SSA_NAME)
+	{
+	  rhs1_stmt = SSA_NAME_DEF_STMT (rhs1);
+	  if (is_gimple_assign (rhs1_stmt))
+	    rhs1_code = gimple_assign_rhs_code (rhs1_stmt);
+	}
+      else
+	return false;
+    }
+  if (CONVERT_EXPR_CODE_P (rhs2_code))
+    {
+      conv2_stmt = rhs2_stmt;
+      rhs2 = gimple_assign_rhs1 (rhs2_stmt);
+      if (TREE_CODE (rhs2) == SSA_NAME)
+	{
+	  rhs2_stmt = SSA_NAME_DEF_STMT (rhs2);
+	  if (is_gimple_assign (rhs2_stmt))
+	    rhs2_code = gimple_assign_rhs_code (rhs2_stmt);
+	}
+      else
+	return false;
+    }
+
+  /* If code is WIDEN_MULT_EXPR then it would seem unnecessary to call
+     is_widening_mult_p, but we still need the rhs returns.
+
+     It might also appear that it would be sufficient to use the existing
+     operands of the widening multiply, but that would limit the choice of
+     multiply-and-accumulate instructions.  */
+  if (code == PLUS_EXPR
+      && (rhs1_code == MULT_EXPR || rhs1_code == WIDEN_MULT_EXPR))
+    {
+      if (!is_widening_mult_p (type, rhs1_stmt, &type1, &mult_rhs1,
+			       &type2, &mult_rhs2))
+	return false;
+      add_rhs = rhs2;
+      conv_stmt = conv1_stmt;
+    }
+  else if (rhs2_code == MULT_EXPR || rhs2_code == WIDEN_MULT_EXPR)
+    {
+      if (!is_widening_mult_p (type, rhs2_stmt, &type1, &mult_rhs1,
+			       &type2, &mult_rhs2))
+	return false;
+      add_rhs = rhs1;
+      conv_stmt = conv2_stmt;
+    }
+  else
+    return false;
+
+  to_mode = TYPE_MODE (type);
+  from_mode = TYPE_MODE (type1);
+  from_unsigned1 = TYPE_UNSIGNED (type1);
+  from_unsigned2 = TYPE_UNSIGNED (type2);
+
+  /* There's no such thing as a mixed sign madd yet, so use a wider mode.  */
+  if (from_unsigned1 != from_unsigned2)
+    {
+      /* We can use a signed multiply with unsigned types as long as
+	 there is a wider mode to use, or it is the smaller of the two
+	 types that is unsigned.  Note that type1 >= type2, always.  */
+      if ((from_unsigned1
+	   && TYPE_PRECISION (type1) == GET_MODE_PRECISION (from_mode))
+	  || (from_unsigned2
+	      && TYPE_PRECISION (type2) == GET_MODE_PRECISION (from_mode)))
+	{
+	  from_mode = GET_MODE_WIDER_MODE (from_mode);
+	  if (GET_MODE_SIZE (from_mode) >= GET_MODE_SIZE (to_mode))
+	    return false;
+	}
+
+      from_unsigned1 = from_unsigned2 = false;
+    }
+
+  /* If there was a conversion between the multiply and addition
+     then we need to make sure it fits a multiply-and-accumulate.
+     The should be a single mode change which does not change the
+     value.  */
+  if (conv_stmt)
+    {
+      /* We use the original, unmodified data types for this.  */
+      tree from_type = TREE_TYPE (gimple_assign_rhs1 (conv_stmt));
+      tree to_type = TREE_TYPE (gimple_assign_lhs (conv_stmt));
+      int data_size = TYPE_PRECISION (type1) + TYPE_PRECISION (type2);
+      bool is_unsigned = TYPE_UNSIGNED (type1) && TYPE_UNSIGNED (type2);
+
+      if (TYPE_PRECISION (from_type) > TYPE_PRECISION (to_type))
+	{
+	  /* Conversion is a truncate.  */
+	  if (TYPE_PRECISION (to_type) < data_size)
+	    return false;
+	}
+      else if (TYPE_PRECISION (from_type) < TYPE_PRECISION (to_type))
+	{
+	  /* Conversion is an extend.  Check it's the right sort.  */
+	  if (TYPE_UNSIGNED (from_type) != is_unsigned
+	      && !(is_unsigned && TYPE_PRECISION (from_type) > data_size))
+	    return false;
+	}
+      /* else convert is a no-op for our purposes.  */
+    }
 
   /* Verify that the machine can perform a widening multiply
      accumulate in this mode/signedness combination, otherwise
      this transformation is likely to pessimize code.  */
-  this_optab = optab_for_tree_code (wmult_code, type1, optab_default);
-  if (optab_handler (this_optab, TYPE_MODE (type)) == CODE_FOR_nothing)
+  optype = build_nonstandard_integer_type (from_mode, from_unsigned1);
+  this_optab = optab_for_tree_code (wmult_code, optype, optab_default);
+  handler = find_widening_optab_handler_and_mode (this_optab, to_mode,
+						  from_mode, 0, &actual_mode);
+
+  if (handler == CODE_FOR_nothing)
     return false;
 
-  /* ??? May need some type verification here?  */
-
-  gimple_assign_set_rhs_with_ops_1 (gsi, wmult_code,
-				    fold_convert (type1, mult_rhs1),
-				    fold_convert (type2, mult_rhs2),
+  /* Ensure that the inputs to the handler are in the correct precison
+     for the opcode.  This will be the full mode size.  */
+  actual_precision = GET_MODE_PRECISION (actual_mode);
+  if (actual_precision != TYPE_PRECISION (type1)
+      || from_unsigned1 != TYPE_UNSIGNED (type1))
+    {
+      tmp = create_tmp_var (build_nonstandard_integer_type
+				(actual_precision, from_unsigned1),
+			    NULL);
+      mult_rhs1 = build_and_insert_cast (gsi, loc, tmp, mult_rhs1);
+    }
+  if (actual_precision != TYPE_PRECISION (type2)
+      || from_unsigned2 != TYPE_UNSIGNED (type2))
+    {
+      if (!tmp || from_unsigned1 != from_unsigned2)
+	tmp = create_tmp_var (build_nonstandard_integer_type
+				(actual_precision, from_unsigned2),
+			      NULL);
+      mult_rhs2 = build_and_insert_cast (gsi, loc, tmp, mult_rhs2);
+    }
+
+  if (!useless_type_conversion_p (type, TREE_TYPE (add_rhs)))
+    add_rhs = build_and_insert_cast (gsi, loc, create_tmp_var (type, NULL),
+				     add_rhs);
+
+  /* Handle constants.  */
+  if (TREE_CODE (mult_rhs1) == INTEGER_CST)
+    rhs1 = fold_convert (type1, mult_rhs1);
+  if (TREE_CODE (mult_rhs2) == INTEGER_CST)
+    rhs2 = fold_convert (type2, mult_rhs2);
+
+  gimple_assign_set_rhs_with_ops_1 (gsi, wmult_code, mult_rhs1, mult_rhs2,
 				    add_rhs);
   update_stmt (gsi_stmt (*gsi));
   return true;
@@ -1696,7 +1916,7 @@
 	      switch (code)
 		{
 		case MULT_EXPR:
-		  if (!convert_mult_to_widen (stmt)
+		  if (!convert_mult_to_widen (stmt, &gsi)
 		      && convert_mult_to_fma (stmt,
 					      gimple_assign_rhs1 (stmt),
 					      gimple_assign_rhs2 (stmt)))