Merge lp:~ams-codesourcery/gcc-linaro/lp663939 into lp:gcc-linaro/4.6

[Andrew Stubbs]

These patches improve support for Thumb replicated constants, add support for ADDW and SUBW, and ensure that the most efficient sense is used (inverted, negated, or normal).

This addresses the problems identified in LP:663939.

It has now been approved upstream in this new form.

Update: The testing found a bug. I think I fixed this now, and I've overwritten this branch with the fixed patch.

(Resubmitted with updated patches 2011-08-25)

[Loïc Minier (lool)]

Looks like we should ping upstream again here

[Loïc Minier (lool)]

11:57 < lool> ams_cs: Is
https://code.launchpad.net/~ams-codesourcery/gcc-linaro/lp663939/+merge/45750
              still work in progress? It seems really old now
[...]
11:58 < ams_cs> lool: last activity 12th april
11:58 < ams_cs> lool: I have to do some reworking
11:58 < ams_cs> lool: I've also discussed this patch with Ramana quite a bit

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+PASS: gcc.target/arm/thumb2-replicated-constant1.c (test for excess errors)
+PASS: gcc.target/arm/thumb2-replicated-constant1.c scan-assembler add.*#-16843010
+PASS: gcc.target/arm/thumb2-replicated-constant1.c scan-assembler and.*#13435085
+PASS: gcc.target/arm/thumb2-replicated-constant1.c scan-assembler sub.*#-1426019584
+PASS: gcc.target/arm/thumb2-replicated-constant2.c (test for excess errors)
+PASS: gcc.target/arm/thumb2-replicated-constant2.c scan-assembler add.*#-2004318072
+PASS: gcc.target/arm/thumb2-replicated-constant2.c scan-assembler add.*#-33489408
+PASS: gcc.target/arm/thumb2-replicated-constant2.c scan-assembler add.*#-572662307
+PASS: gcc.target/arm/thumb2-replicated-constant2.c scan-assembler add.*#-587145984
+PASS: gcc.target/arm/thumb2-replicated-constant2.c scan-assembler add.*#1
+PASS: gcc.target/arm/thumb2-replicated-constant2.c scan-assembler add.*#13056
+PASS: gcc.target/arm/thumb2-replicated-constant2.c scan-assembler add.*#17
+PASS: gcc.target/arm/thumb2-replicated-constant2.c scan-assembler add.*#1717986918
+PASS: gcc.target/arm/thumb2-replicated-constant2.c scan-assembler add.*#1996488704
+PASS: gcc.target/arm/thumb2-replicated-constant2.c scan-assembler add.*#2228258
+PASS: gcc.target/arm/thumb2-replicated-constant2.c scan-assembler add.*#285212672
+PASS: gcc.target/arm/thumb2-replicated-constant2.c scan-assembler add.*#285217024
+PASS: gcc.target/arm/thumb2-replicated-constant2.c scan-assembler add.*#3342387
+PASS: gcc.target/arm/thumb2-replicated-constant2.c scan-assembler add.*#4456516
+PASS: gcc.target/arm/thumb2-replicated-constant2.c scan-assembler add.*#65536
+PASS: gcc.target/arm/thumb2-replicated-constant2.c scan-assembler addw.*#546
+PASS: gcc.target/arm/thumb2-replicated-constant3.c (test for excess errors)
+PASS: gcc.target/arm/thumb2-replicated-constant3.c scan-assembler and.*#-1431655766
+PASS: gcc.target/arm/thumb2-replicated-constant3.c scan-assembler bic.*#1114129
+PASS: gcc.target/arm/thumb2-replicated-constant3.c scan-assembler bic.*#170
+PASS: gcc.target/arm/thumb2-replicated-constant3.c scan-assembler orn.*#255
+PASS: gcc.target/arm/thumb2-replicated-constant4.c (test for excess errors)
+PASS: gcc.target/arm/thumb2-replicated-constant4.c scan-assembler add.*#252706816
+PASS: gcc.target/arm/thumb2-replicated-constant4.c scan-assembler add.*#32505856
+PASS: gcc.target/arm/thumb2-replicated-constant4.c scan-assembler add.*#3600
+PASS: gcc.target/arm/thumb2-replicated-constant4.c scan-assembler add.*#480

The full testsuite results are at:
 http://ex.seabright.co.nz/build/gcc-linaro-4.6+bzr106800~ams-codesourcery~lp663939/logs/armv7l-natty-cbuild172-ursa1-cortexa9r1/gcc-testsuite.txt

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The testsuite results are the same as the branch point lp:gcc-linaro/4.6+bzr106796

The full testsuite results are at:
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The build results are available at:
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+PASS: gcc.target/arm/thumb2-replicated-constant1.c (test for excess errors)
+PASS: gcc.target/arm/thumb2-replicated-constant1.c scan-assembler add.*#-16843010
+PASS: gcc.target/arm/thumb2-replicated-constant1.c scan-assembler and.*#13435085
+PASS: gcc.target/arm/thumb2-replicated-constant1.c scan-assembler sub.*#-1426019584
+PASS: gcc.target/arm/thumb2-replicated-constant2.c (test for excess errors)
+PASS: gcc.target/arm/thumb2-replicated-constant2.c scan-assembler add.*#-2004318072
+PASS: gcc.target/arm/thumb2-replicated-constant2.c scan-assembler add.*#-33489408
+PASS: gcc.target/arm/thumb2-replicated-constant2.c scan-assembler add.*#-572662307
+PASS: gcc.target/arm/thumb2-replicated-constant2.c scan-assembler add.*#-587145984
+PASS: gcc.target/arm/thumb2-replicated-constant2.c scan-assembler add.*#1
+PASS: gcc.target/arm/thumb2-replicated-constant2.c scan-assembler add.*#13056
+PASS: gcc.target/arm/thumb2-replicated-constant2.c scan-assembler add.*#17
+PASS: gcc.target/arm/thumb2-replicated-constant2.c scan-assembler add.*#1717986918
+PASS: gcc.target/arm/thumb2-replicated-constant2.c scan-assembler add.*#1996488704
+PASS: gcc.target/arm/thumb2-replicated-constant2.c scan-assembler add.*#2228258
+PASS: gcc.target/arm/thumb2-replicated-constant2.c scan-assembler add.*#285212672
+PASS: gcc.target/arm/thumb2-replicated-constant2.c scan-assembler add.*#285217024
+PASS: gcc.target/arm/thumb2-replicated-constant2.c scan-assembler add.*#3342387
+PASS: gcc.target/arm/thumb2-replicated-constant2.c scan-assembler add.*#4456516
+PASS: gcc.target/arm/thumb2-replicated-constant2.c scan-assembler add.*#65536
+PASS: gcc.target/arm/thumb2-replicated-constant2.c scan-assembler addw.*#546
+PASS: gcc.target/arm/thumb2-replicated-constant3.c (test for excess errors)
+PASS: gcc.target/arm/thumb2-replicated-constant3.c scan-assembler and.*#-1431655766
+PASS: gcc.target/arm/thumb2-replicated-constant3.c scan-assembler bic.*#1114129
+PASS: gcc.target/arm/thumb2-replicated-constant3.c scan-assembler bic.*#170
+PASS: gcc.target/arm/thumb2-replicated-constant3.c scan-assembler orn.*#255
+PASS: gcc.target/arm/thumb2-replicated-constant4.c (test for excess errors)
+PASS: gcc.target/arm/thumb2-replicated-constant4.c scan-assembler add.*#252706816
+PASS: gcc.target/arm/thumb2-replicated-constant4.c scan-assembler add.*#32505856
+PASS: gcc.target/arm/thumb2-replicated-constant4.c scan-assembler add.*#3600
+PASS: gcc.target/arm/thumb2-replicated-constant4.c scan-assembler add.*#480

The full testsuite results are at:
 http://ex.seabright.co.nz/build/gcc-linaro-4.6+bzr106800~ams-codesourcery~lp663939/logs/armv7l-natty-cbuild172-ursa1-cortexa9r1/gcc-testsuite.txt

cbuild-checked: armv7l-natty-cbuild172-ursa1-cortexa9r1

[Richard Sandiford (rsandifo)]

OK

review: Approve

=== modified file 'ChangeLog.linaro'
--- ChangeLog.linaro	2011-08-25 11:42:09 +0000
+++ ChangeLog.linaro	2011-08-25 13:44:32 +0000
@@ -2,6 +2,21 @@
 
 	Backport from FSF mainline:
 
+	2011-04-20  Andrew Stubbs  <[e-mail]>
+
+	gcc/
+	* config/arm/arm.c (arm_gen_constant): Move movw support ....
+	(const_ok_for_op): ... to here.
+
+	2011-04-20  Andrew Stubbs  <[e-mail]>
+
+	gcc/
+	* config/arm/arm.c (arm_gen_constant): Remove redundant can_invert.
+
[phone]  Andrew Stubbs  <[e-mail]>
+
+	Backport from FSF mainline:
+
 	2011-08-19  Andrew Stubbs  <[e-mail]>
 
 	gcc/

=== modified file 'gcc/config/arm/arm-protos.h'
--- gcc/config/arm/arm-protos.h	2011-07-04 14:03:49 +0000
+++ gcc/config/arm/arm-protos.h	2011-08-25 13:44:32 +0000
@@ -46,6 +46,7 @@
 extern bool arm_small_register_classes_for_mode_p (enum machine_mode);
 extern int arm_hard_regno_mode_ok (unsigned int, enum machine_mode);
 extern int const_ok_for_arm (HOST_WIDE_INT);
+extern int const_ok_for_op (HOST_WIDE_INT, enum rtx_code);
 extern int arm_split_constant (RTX_CODE, enum machine_mode, rtx,
 			       HOST_WIDE_INT, rtx, rtx, int);
 extern RTX_CODE arm_canonicalize_comparison (RTX_CODE, rtx *, rtx *);

=== modified file 'gcc/config/arm/arm.c'
--- gcc/config/arm/arm.c	2011-08-24 17:35:16 +0000
+++ gcc/config/arm/arm.c	2011-08-25 13:44:32 +0000
@@ -63,6 +63,11 @@
 
 void (*arm_lang_output_object_attributes_hook)(void);
 
+struct four_ints
+{
+  int i[4];
+};
+
 /* Forward function declarations.  */
 static bool arm_needs_doubleword_align (enum machine_mode, const_tree);
 static int arm_compute_static_chain_stack_bytes (void);
@@ -81,7 +86,6 @@
 static bool arm_legitimate_address_p (enum machine_mode, rtx, bool);
 static int thumb_far_jump_used_p (void);
 static bool thumb_force_lr_save (void);
-static int const_ok_for_op (HOST_WIDE_INT, enum rtx_code);
 static rtx emit_sfm (int, int);
 static unsigned arm_size_return_regs (void);
 static bool arm_assemble_integer (rtx, unsigned int, int);
@@ -129,7 +133,13 @@
 static int arm_comp_type_attributes (const_tree, const_tree);
 static void arm_set_default_type_attributes (tree);
 static int arm_adjust_cost (rtx, rtx, rtx, int);
-static int count_insns_for_constant (HOST_WIDE_INT, int);
+static int optimal_immediate_sequence (enum rtx_code code,
+				       unsigned HOST_WIDE_INT val,
+				       struct four_ints *return_sequence);
+static int optimal_immediate_sequence_1 (enum rtx_code code,
+					 unsigned HOST_WIDE_INT val,
+					 struct four_ints *return_sequence,
+					 int i);
 static int arm_get_strip_length (int);
 static bool arm_function_ok_for_sibcall (tree, tree);
 static enum machine_mode arm_promote_function_mode (const_tree,
@@ -2525,7 +2535,7 @@
 }
 
 /* Return true if I is a valid constant for the operation CODE.  */
-static int
+int
 const_ok_for_op (HOST_WIDE_INT i, enum rtx_code code)
 {
   if (const_ok_for_arm (i))
@@ -2533,7 +2543,21 @@
 
   switch (code)
     {
+    case SET:
+      /* See if we can use movw.  */
+      if (arm_arch_thumb2 && (i & 0xffff0000) == 0)
+	return 1;
+      else
+	return 0;
+
     case PLUS:
+      /* See if we can use addw or subw.  */
+      if (TARGET_THUMB2
+	  && ((i & 0xfffff000) == 0
+	      || ((-i) & 0xfffff000) == 0))
+	return 1;
+      /* else fall through.  */
+
     case COMPARE:
     case EQ:
     case NE:
@@ -2649,68 +2673,41 @@
 			   1);
 }
 
-/* Return the number of instructions required to synthesize the given
-   constant, if we start emitting them from bit-position I.  */
-static int
-count_insns_for_constant (HOST_WIDE_INT remainder, int i)
-{
-  HOST_WIDE_INT temp1;
-  int step_size = TARGET_ARM ? 2 : 1;
-  int num_insns = 0;
-
-  gcc_assert (TARGET_ARM || i == 0);
-
-  do
-    {
-      int end;
-
-      if (i <= 0)
-	i += 32;
-      if (remainder & (((1 << step_size) - 1) << (i - step_size)))
-	{
-	  end = i - 8;
-	  if (end < 0)
-	    end += 32;
-	  temp1 = remainder & ((0x0ff << end)
-				    | ((i < end) ? (0xff >> (32 - end)) : 0));
-	  remainder &= ~temp1;
-	  num_insns++;
-	  i -= 8 - step_size;
-	}
-      i -= step_size;
-    } while (remainder);
-  return num_insns;
-}
-
-static int
-find_best_start (unsigned HOST_WIDE_INT remainder)
+/* Return a sequence of integers, in RETURN_SEQUENCE that fit into
+   ARM/THUMB2 immediates, and add up to VAL.
+   Thr function return value gives the number of insns required.  */
+static int
+optimal_immediate_sequence (enum rtx_code code, unsigned HOST_WIDE_INT val,
+			    struct four_ints *return_sequence)
 {
   int best_consecutive_zeros = 0;
   int i;
   int best_start = 0;
+  int insns1, insns2;
+  struct four_ints tmp_sequence;
 
   /* If we aren't targetting ARM, the best place to start is always at
-     the bottom.  */
-  if (! TARGET_ARM)
-    return 0;
-
-  for (i = 0; i < 32; i += 2)
+     the bottom, otherwise look more closely.  */
+  if (TARGET_ARM)
     {
-      int consecutive_zeros = 0;
-
-      if (!(remainder & (3 << i)))
+      for (i = 0; i < 32; i += 2)
 	{
-	  while ((i < 32) && !(remainder & (3 << i)))
-	    {
-	      consecutive_zeros += 2;
-	      i += 2;
-	    }
-	  if (consecutive_zeros > best_consecutive_zeros)
-	    {
-	      best_consecutive_zeros = consecutive_zeros;
-	      best_start = i - consecutive_zeros;
-	    }
-	  i -= 2;
+	  int consecutive_zeros = 0;
+
+	  if (!(val & (3 << i)))
+	    {
+	      while ((i < 32) && !(val & (3 << i)))
+		{
+		  consecutive_zeros += 2;
+		  i += 2;
+		}
+	      if (consecutive_zeros > best_consecutive_zeros)
+		{
+		  best_consecutive_zeros = consecutive_zeros;
+		  best_start = i - consecutive_zeros;
+		}
+	      i -= 2;
+	    }
 	}
     }
 
@@ -2737,13 +2734,161 @@
      the constant starting from `best_start', and also starting from
      zero (i.e. with bit 31 first to be output).  If `best_start' doesn't
      yield a shorter sequence, we may as well use zero.  */
+  insns1 = optimal_immediate_sequence_1 (code, val, return_sequence, best_start);
   if (best_start != 0
-      && ((((unsigned HOST_WIDE_INT) 1) << best_start) < remainder)
-      && (count_insns_for_constant (remainder, 0) <=
-	  count_insns_for_constant (remainder, best_start)))
-    best_start = 0;
-
-  return best_start;
+      && ((((unsigned HOST_WIDE_INT) 1) << best_start) < val))
+    {
+      insns2 = optimal_immediate_sequence_1 (code, val, &tmp_sequence, 0);
+      if (insns2 <= insns1)
+	{
+	  *return_sequence = tmp_sequence;
+	  insns1 = insns2;
+	}
+    }
+
+  return insns1;
+}
+
+/* As for optimal_immediate_sequence, but starting at bit-position I.  */
+static int
+optimal_immediate_sequence_1 (enum rtx_code code, unsigned HOST_WIDE_INT val,
+			     struct four_ints *return_sequence, int i)
+{
+  int remainder = val & 0xffffffff;
+  int insns = 0;
+
+  /* Try and find a way of doing the job in either two or three
+     instructions.
+     
+     In ARM mode we can use 8-bit constants, rotated to any 2-bit aligned
+     location.  We start at position I.  This may be the MSB, or
+     optimial_immediate_sequence may have positioned it at the largest block 
+     of zeros that are aligned on a 2-bit boundary. We then fill up the temps,
+     wrapping around to the top of the word when we drop off the bottom.
+     In the worst case this code should produce no more than four insns.
+
+     In Thumb2 mode, we can use 32/16-bit replicated constants, and 8-bit
+     constants, shifted to any arbitrary location.  We should always start
+     at the MSB.  */
+  do
+    {
+      int end;
+      int b1, b2, b3, b4;
+      unsigned HOST_WIDE_INT result;
+      int loc;
+
+      gcc_assert (insns < 4);
+
+      if (i <= 0)
+	i += 32;
+
+      /* First, find the next normal 12/8-bit shifted/rotated immediate.  */
+      if (remainder & ((TARGET_ARM ? (3 << (i - 2)) : (1 << (i - 1)))))
+	{
+	  loc = i;
+	  if (i <= 12 && TARGET_THUMB2 && code == PLUS)
+	    /* We can use addw/subw for the last 12 bits.  */
+	    result = remainder;
+	  else
+	    {
+	      /* Use an 8-bit shifted/rotated immediate.  */
+	      end = i - 8;
+	      if (end < 0)
+		end += 32;
+	      result = remainder & ((0x0ff << end)
+				   | ((i < end) ? (0xff >> (32 - end))
+						: 0));
+	      i -= 8;
+	    }
+	}
+      else
+	{
+	  /* Arm allows rotates by a multiple of two. Thumb-2 allows
+	     arbitrary shifts.  */
+	  i -= TARGET_ARM ? 2 : 1;
+	  continue;
+	}
+
+      /* Next, see if we can do a better job with a thumb2 replicated
+	 constant.
+       
+         We do it this way around to catch the cases like 0x01F001E0 where
+	 two 8-bit immediates would work, but a replicated constant would
+	 make it worse.
+       
+         TODO: 16-bit constants that don't clear all the bits, but still win.
+         TODO: Arithmetic splitting for set/add/sub, rather than bitwise.  */
+      if (TARGET_THUMB2)
+	{
+	  b1 = (remainder & 0xff000000) >> 24;
+	  b2 = (remainder & 0x00ff0000) >> 16;
+	  b3 = (remainder & 0x0000ff00) >> 8;
+	  b4 = remainder & 0xff;
+
+	  if (loc > 24)
+	    {
+	      /* The 8-bit immediate already found clears b1 (and maybe b2),
+		 but must leave b3 and b4 alone.  */
+
+	      /* First try to find a 32-bit replicated constant that clears
+		 almost everything.  We can assume that we can't do it in one,
+		 or else we wouldn't be here.  */
+	      unsigned int tmp = b1 & b2 & b3 & b4;
+	      unsigned int tmp2 = tmp + (tmp << 8) + (tmp << 16)
+				  + (tmp << 24);
+	      unsigned int matching_bytes = (tmp == b1) + (tmp == b2)
+					    + (tmp == b3) + (tmp == b4);
+	      if (tmp
+		  && (matching_bytes >= 3
+		      || (matching_bytes == 2
+			  && const_ok_for_op (remainder & ~tmp2, code))))
+		{
+		  /* At least 3 of the bytes match, and the fourth has at 
+		     least as many bits set, or two of the bytes match
+		     and it will only require one more insn to finish.  */
+		  result = tmp2;
+		  i = tmp != b1 ? 32
+		      : tmp != b2 ? 24
+		      : tmp != b3 ? 16
+		      : 8;
+		}
+
+	      /* Second, try to find a 16-bit replicated constant that can
+		 leave three of the bytes clear.  If b2 or b4 is already
+		 zero, then we can.  If the 8-bit from above would not
+		 clear b2 anyway, then we still win.  */
+	      else if (b1 == b3 && (!b2 || !b4
+			       || (remainder & 0x00ff0000 & ~result)))
+		{
+		  result = remainder & 0xff00ff00;
+		  i = 24;
+		}
+	    }
+	  else if (loc > 16)
+	    {
+	      /* The 8-bit immediate already found clears b2 (and maybe b3)
+		 and we don't get here unless b1 is alredy clear, but it will
+		 leave b4 unchanged.  */
+
+	      /* If we can clear b2 and b4 at once, then we win, since the
+		 8-bits couldn't possibly reach that far.  */
+	      if (b2 == b4)
+		{
+		  result = remainder & 0x00ff00ff;
+		  i = 16;
+		}
+	    }
+	}
+
+      return_sequence->i[insns++] = result;
+      remainder &= ~result;
+
+      if (code == SET || code == MINUS)
+	code = PLUS;
+    }
+  while (remainder);
+
+  return insns;
 }
 
 /* Emit an instruction with the indicated PATTERN.  If COND is
@@ -2760,7 +2905,6 @@
 
 /* As above, but extra parameter GENERATE which, if clear, suppresses
    RTL generation.  */
-/* ??? This needs more work for thumb2.  */
 
 static int
 arm_gen_constant (enum rtx_code code, enum machine_mode mode, rtx cond,
@@ -2772,15 +2916,15 @@
   int final_invert = 0;
   int can_negate_initial = 0;
   int i;
-  int num_bits_set = 0;
   int set_sign_bit_copies = 0;
   int clear_sign_bit_copies = 0;
   int clear_zero_bit_copies = 0;
   int set_zero_bit_copies = 0;
-  int insns = 0;
+  int insns = 0, neg_insns, inv_insns;
   unsigned HOST_WIDE_INT temp1, temp2;
   unsigned HOST_WIDE_INT remainder = val & 0xffffffff;
-  int step_size = TARGET_ARM ? 2 : 1;
+  struct four_ints *immediates;
+  struct four_ints pos_immediates, neg_immediates, inv_immediates;
 
   /* Find out which operations are safe for a given CODE.  Also do a quick
      check for degenerate cases; these can occur when DImode operations
@@ -2789,7 +2933,6 @@
     {
     case SET:
       can_invert = 1;
-      can_negate = 1;
       break;
 
     case PLUS:
@@ -2817,9 +2960,6 @@
 				gen_rtx_SET (VOIDmode, target, source));
 	  return 1;
 	}
-
-      if (TARGET_THUMB2)
-	can_invert = 1;
       break;
 
     case AND:
@@ -2861,6 +3001,7 @@
 					     gen_rtx_NOT (mode, source)));
 	  return 1;
 	}
+      final_invert = 1;
       break;
 
     case MINUS:
@@ -2883,7 +3024,6 @@
 							    source)));
 	  return 1;
 	}
-      can_negate = 1;
 
       break;
 
@@ -2892,9 +3032,7 @@
     }
 
   /* If we can do it in one insn get out quickly.  */
-  if (const_ok_for_arm (val)
-      || (can_negate_initial && const_ok_for_arm (-val))
-      || (can_invert && const_ok_for_arm (~val)))
+  if (const_ok_for_op (val, code))
     {
       if (generate)
 	emit_constant_insn (cond,
@@ -2947,15 +3085,6 @@
   switch (code)
     {
     case SET:
-      /* See if we can use movw.  */
-      if (arm_arch_thumb2 && (remainder & 0xffff0000) == 0)
-	{
-	  if (generate)
-	    emit_constant_insn (cond, gen_rtx_SET (VOIDmode, target,
-						   GEN_INT (val)));
-	  return 1;
-	}
-
       /* See if we can do this by sign_extending a constant that is known
 	 to be negative.  This is a good, way of doing it, since the shift
 	 may well merge into a subsequent insn.  */
@@ -3306,121 +3435,97 @@
       break;
     }
 
-  for (i = 0; i < 32; i++)
-    if (remainder & (1 << i))
-      num_bits_set++;
-
-  if ((code == AND)
-      || (code != IOR && can_invert && num_bits_set > 16))
-    remainder ^= 0xffffffff;
-  else if (code == PLUS && num_bits_set > 16)
-    remainder = (-remainder) & 0xffffffff;
-
-  /* For XOR, if more than half the bits are set and there's a sequence
-     of more than 8 consecutive ones in the pattern then we can XOR by the
-     inverted constant and then invert the final result; this may save an
-     instruction and might also lead to the final mvn being merged with
-     some other operation.  */
-  else if (code == XOR && num_bits_set > 16
-	   && (count_insns_for_constant (remainder ^ 0xffffffff,
-					 find_best_start
-					 (remainder ^ 0xffffffff))
-	       < count_insns_for_constant (remainder,
-					   find_best_start (remainder))))
-    {
-      remainder ^= 0xffffffff;
-      final_invert = 1;
+  /* Calculate what the instruction sequences would be if we generated it
+     normally, negated, or inverted.  */
+  if (code == AND)
+    /* AND cannot be split into multiple insns, so invert and use BIC.  */
+    insns = 99;
+  else
+    insns = optimal_immediate_sequence (code, remainder, &pos_immediates);
+
+  if (can_negate)
+    neg_insns = optimal_immediate_sequence (code, (-remainder) & 0xffffffff,
+					    &neg_immediates);
+  else
+    neg_insns = 99;
+
+  if (can_invert || final_invert)
+    inv_insns = optimal_immediate_sequence (code, remainder ^ 0xffffffff,
+					    &inv_immediates);
+  else
+    inv_insns = 99;
+
+  immediates = &pos_immediates;
+
+  /* Is the negated immediate sequence more efficient?  */
+  if (neg_insns < insns && neg_insns <= inv_insns)
+    {
+      insns = neg_insns;
+      immediates = &neg_immediates;
+    }
+  else
+    can_negate = 0;
+
+  /* Is the inverted immediate sequence more efficient?
+     We must allow for an extra NOT instruction for XOR operations, although
+     there is some chance that the final 'mvn' will get optimized later.  */
+  if ((inv_insns + 1) < insns || (!final_invert && inv_insns < insns))
+    {
+      insns = inv_insns;
+      immediates = &inv_immediates;
     }
   else
     {
       can_invert = 0;
-      can_negate = 0;
+      final_invert = 0;
     }
 
-  /* Now try and find a way of doing the job in either two or three
-     instructions.
-     We start by looking for the largest block of zeros that are aligned on
-     a 2-bit boundary, we then fill up the temps, wrapping around to the
-     top of the word when we drop off the bottom.
-     In the worst case this code should produce no more than four insns.
-     Thumb-2 constants are shifted, not rotated, so the MSB is always the
-     best place to start.  */
-
-  /* ??? Use thumb2 replicated constants when the high and low halfwords are
-     the same.  */
-  {
-    /* Now start emitting the insns.  */
-    i = find_best_start (remainder);
-    do
-      {
-	int end;
-
-	if (i <= 0)
-	  i += 32;
-	if (remainder & (3 << (i - 2)))
-	  {
-	    end = i - 8;
-	    if (end < 0)
-	      end += 32;
-	    temp1 = remainder & ((0x0ff << end)
-				 | ((i < end) ? (0xff >> (32 - end)) : 0));
-	    remainder &= ~temp1;
-
-	    if (generate)
-	      {
-		rtx new_src, temp1_rtx;
-
-		if (code == SET || code == MINUS)
-		  {
-		    new_src = (subtargets ? gen_reg_rtx (mode) : target);
-		    if (can_invert && code != MINUS)
-		      temp1 = ~temp1;
-		  }
-		else
-		  {
-		    if ((final_invert || remainder) && subtargets)
-		      new_src = gen_reg_rtx (mode);
-		    else
-		      new_src = target;
-		    if (can_invert)
-		      temp1 = ~temp1;
-		    else if (can_negate)
-		      temp1 = -temp1;
-		  }
-
-		temp1 = trunc_int_for_mode (temp1, mode);
-		temp1_rtx = GEN_INT (temp1);
-
-		if (code == SET)
-		  ;
-		else if (code == MINUS)
-		  temp1_rtx = gen_rtx_MINUS (mode, temp1_rtx, source);
-		else
-		  temp1_rtx = gen_rtx_fmt_ee (code, mode, source, temp1_rtx);
-
-		emit_constant_insn (cond,
-				    gen_rtx_SET (VOIDmode, new_src,
-						 temp1_rtx));
-		source = new_src;
-	      }
-
-	    if (code == SET)
-	      {
-		can_invert = 0;
-		code = PLUS;
-	      }
-	    else if (code == MINUS)
+  /* Now output the chosen sequence as instructions.  */
+  if (generate)
+    {
+      for (i = 0; i < insns; i++)
+	{
+	  rtx new_src, temp1_rtx;
+
+	  temp1 = immediates->i[i];
+
+	  if (code == SET || code == MINUS)
+	    new_src = (subtargets ? gen_reg_rtx (mode) : target);
+	  else if ((final_invert || i < (insns - 1)) && subtargets)
+	    new_src = gen_reg_rtx (mode);
+	  else
+	    new_src = target;
+
+	  if (can_invert)
+	    temp1 = ~temp1;
+	  else if (can_negate)
+	    temp1 = -temp1;
+
+	  temp1 = trunc_int_for_mode (temp1, mode);
+	  temp1_rtx = GEN_INT (temp1);
+
+	  if (code == SET)
+	    ;
+	  else if (code == MINUS)
+	    temp1_rtx = gen_rtx_MINUS (mode, temp1_rtx, source);
+	  else
+	    temp1_rtx = gen_rtx_fmt_ee (code, mode, source, temp1_rtx);
+
+	  emit_constant_insn (cond,
+			      gen_rtx_SET (VOIDmode, new_src,
+					   temp1_rtx));
+	  source = new_src;
+
+	  if (code == SET)
+	    {
+	      can_invert = 0;
+	      can_negate = 1;
 	      code = PLUS;
-
-	    insns++;
-	    i -= 8 - step_size;
-	  }
-	/* Arm allows rotates by a multiple of two. Thumb-2 allows arbitrary
-	   shifts.  */
-	i -= step_size;
-      }
-    while (remainder);
-  }
+	    }
+	  else if (code == MINUS)
+	    code = PLUS;
+	}
+    }
 
   if (final_invert)
     {

=== modified file 'gcc/config/arm/arm.md'
--- gcc/config/arm/arm.md	2011-08-25 11:42:09 +0000
+++ gcc/config/arm/arm.md	2011-08-25 13:44:32 +0000
@@ -701,21 +701,24 @@
 ;;  (plus (reg rN) (reg sp)) into (reg rN).  In this case reload will
 ;; put the duplicated register first, and not try the commutative version.
 (define_insn_and_split "*arm_addsi3"
-  [(set (match_operand:SI          0 "s_register_operand" "=r, k,r,r, k,r")
-	(plus:SI (match_operand:SI 1 "s_register_operand" "%rk,k,r,rk,k,rk")
-		 (match_operand:SI 2 "reg_or_int_operand" "rI,rI,k,L, L,?n")))]
+  [(set (match_operand:SI          0 "s_register_operand" "=r, k,r,r, k, r, k,r, k, r")
+	(plus:SI (match_operand:SI 1 "s_register_operand" "%rk,k,r,rk,k, rk,k,rk,k, rk")
+		 (match_operand:SI 2 "reg_or_int_operand" "rI,rI,k,Pj,Pj,L, L,PJ,PJ,?n")))]
   "TARGET_32BIT"
   "@
    add%?\\t%0, %1, %2
    add%?\\t%0, %1, %2
    add%?\\t%0, %2, %1
-   sub%?\\t%0, %1, #%n2
-   sub%?\\t%0, %1, #%n2
+   addw%?\\t%0, %1, %2
+   addw%?\\t%0, %1, %2
+   sub%?\\t%0, %1, #%n2
+   sub%?\\t%0, %1, #%n2
+   subw%?\\t%0, %1, #%n2
+   subw%?\\t%0, %1, #%n2
    #"
   "TARGET_32BIT
    && GET_CODE (operands[2]) == CONST_INT
-   && !(const_ok_for_arm (INTVAL (operands[2]))
-        || const_ok_for_arm (-INTVAL (operands[2])))
+   && !const_ok_for_op (INTVAL (operands[2]), PLUS)
    && (reload_completed || !arm_eliminable_register (operands[1]))"
   [(clobber (const_int 0))]
   "
@@ -724,8 +727,9 @@
 		      operands[1], 0);
   DONE;
   "
-  [(set_attr "length" "4,4,4,4,4,16")
-   (set_attr "predicable" "yes")]
+  [(set_attr "length" "4,4,4,4,4,4,4,4,4,16")
+   (set_attr "predicable" "yes")
+   (set_attr "arch" "*,*,*,t2,t2,*,*,t2,t2,*")]
 )
 
 (define_insn_and_split "*thumb1_addsi3"

=== modified file 'gcc/config/arm/constraints.md'
--- gcc/config/arm/constraints.md	2011-01-03 20:52:22 +0000
+++ gcc/config/arm/constraints.md	2011-08-25 13:44:32 +0000
@@ -31,7 +31,7 @@
 ;; The following multi-letter normal constraints have been used:
 ;; in ARM/Thumb-2 state: Da, Db, Dc, Dn, Dl, DL, Dv, Dy, Di, Dz
 ;; in Thumb-1 state: Pa, Pb, Pc, Pd
-;; in Thumb-2 state: Ps, Pt, Pu, Pv, Pw, Px
+;; in Thumb-2 state: Pj, PJ, Ps, Pt, Pu, Pv, Pw, Px
 
 ;; The following memory constraints have been used:
 ;; in ARM/Thumb-2 state: Q, Ut, Uv, Uy, Un, Um, Us
@@ -74,6 +74,18 @@
 	   (and (match_code "const_int")
                 (match_test "(ival & 0xffff0000) == 0")))))
 
+(define_constraint "Pj"
+ "@internal A 12-bit constant suitable for an ADDW or SUBW instruction. (Thumb-2)"
+ (and (match_code "const_int")
+      (and (match_test "TARGET_THUMB2")
+	   (match_test "(ival & 0xfffff000) == 0"))))
+
+(define_constraint "PJ"
+ "@internal A constant that satisfies the Pj constrant if negated."
+ (and (match_code "const_int")
+      (and (match_test "TARGET_THUMB2")
+	   (match_test "((-ival) & 0xfffff000) == 0"))))
+
 (define_register_constraint "k" "STACK_REG"
  "@internal The stack register.")
 

=== added file 'gcc/testsuite/gcc.target/arm/thumb2-replicated-constant1.c'
--- gcc/testsuite/gcc.target/arm/thumb2-replicated-constant1.c	1970-01-01 00:00:00 +0000
+++ gcc/testsuite/gcc.target/arm/thumb2-replicated-constant1.c	2011-08-25 13:44:32 +0000
@@ -0,0 +1,27 @@
+/* Ensure simple replicated constant immediates work.  */
+/* { dg-options "-mthumb -O2" } */
+/* { dg-require-effective-target arm_thumb2_ok } */
+
+int
+foo1 (int a)
+{
+  return a + 0xfefefefe;
+}
+
+/* { dg-final { scan-assembler "add.*#-16843010" } } */
+
+int
+foo2 (int a)
+{
+  return a - 0xab00ab00;
+}
+
+/* { dg-final { scan-assembler "sub.*#-1426019584" } } */
+
+int
+foo3 (int a)
+{
+  return a & 0x00cd00cd;
+}
+
+/* { dg-final { scan-assembler "and.*#13435085" } } */

=== added file 'gcc/testsuite/gcc.target/arm/thumb2-replicated-constant2.c'
--- gcc/testsuite/gcc.target/arm/thumb2-replicated-constant2.c	1970-01-01 00:00:00 +0000
+++ gcc/testsuite/gcc.target/arm/thumb2-replicated-constant2.c	2011-08-25 13:44:32 +0000
@@ -0,0 +1,75 @@
+/* Ensure split constants can use replicated patterns.  */
+/* { dg-options "-mthumb -O2" } */
+/* { dg-require-effective-target arm_thumb2_ok } */
+
+int
+foo1 (int a)
+{
+  return a + 0xfe00fe01;
+}
+
+/* { dg-final { scan-assembler "add.*#-33489408" } } */
+/* { dg-final { scan-assembler "add.*#1" } } */
+
+int
+foo2 (int a)
+{
+  return a + 0xdd01dd00;
+}
+
+/* { dg-final { scan-assembler "add.*#-587145984" } } */
+/* { dg-final { scan-assembler "add.*#65536" } } */
+
+int
+foo3 (int a)
+{
+  return a + 0x00443344;
+}
+
+/* { dg-final { scan-assembler "add.*#4456516" } } */
+/* { dg-final { scan-assembler "add.*#13056" } } */
+
+int
+foo4 (int a)
+{
+  return a + 0x77330033;
+}
+
+/* { dg-final { scan-assembler "add.*#1996488704" } } */
+/* { dg-final { scan-assembler "add.*#3342387" } } */
+
+int
+foo5 (int a)
+{
+  return a + 0x11221122;
+}
+
+/* { dg-final { scan-assembler "add.*#285217024" } } */
+/* { dg-final { scan-assembler "add.*#2228258" } } */
+
+int
+foo6 (int a)
+{
+  return a + 0x66666677;
+}
+
+/* { dg-final { scan-assembler "add.*#1717986918" } } */
+/* { dg-final { scan-assembler "add.*#17" } } */
+
+int
+foo7 (int a)
+{
+  return a + 0x99888888;
+}
+
+/* { dg-final { scan-assembler "add.*#-2004318072" } } */
+/* { dg-final { scan-assembler "add.*#285212672" } } */
+
+int
+foo8 (int a)
+{
+  return a + 0xdddddfff;
+}
+
+/* { dg-final { scan-assembler "add.*#-572662307" } } */
+/* { dg-final { scan-assembler "addw.*#546" } } */

=== added file 'gcc/testsuite/gcc.target/arm/thumb2-replicated-constant3.c'
--- gcc/testsuite/gcc.target/arm/thumb2-replicated-constant3.c	1970-01-01 00:00:00 +0000
+++ gcc/testsuite/gcc.target/arm/thumb2-replicated-constant3.c	2011-08-25 13:44:32 +0000
@@ -0,0 +1,28 @@
+/* Ensure negated/inverted replicated constant immediates work.  */
+/* { dg-options "-mthumb -O2" } */
+/* { dg-require-effective-target arm_thumb2_ok } */
+
+int
+foo1 (int a)
+{
+  return a | 0xffffff00;
+}
+
+/* { dg-final { scan-assembler "orn.*#255" } } */
+
+int
+foo2 (int a)
+{
+  return a & 0xffeeffee;
+}
+
+/* { dg-final { scan-assembler "bic.*#1114129" } } */
+
+int
+foo3 (int a)
+{
+  return a & 0xaaaaaa00;
+}
+
+/* { dg-final { scan-assembler "and.*#-1431655766" } } */
+/* { dg-final { scan-assembler "bic.*#170" } } */

=== added file 'gcc/testsuite/gcc.target/arm/thumb2-replicated-constant4.c'
--- gcc/testsuite/gcc.target/arm/thumb2-replicated-constant4.c	1970-01-01 00:00:00 +0000
+++ gcc/testsuite/gcc.target/arm/thumb2-replicated-constant4.c	2011-08-25 13:44:32 +0000
@@ -0,0 +1,22 @@
+/* Ensure replicated constants don't make things worse.  */
+/* { dg-options "-mthumb -O2" } */
+/* { dg-require-effective-target arm_thumb2_ok } */
+
+int
+foo1 (int a)
+{
+  /* It might be tempting to use 0x01000100, but it wouldn't help. */
+  return a + 0x01f001e0;
+}
+
+/* { dg-final { scan-assembler "add.*#32505856" } } */
+/* { dg-final { scan-assembler "add.*#480" } } */
+
+int
+foo2 (int a)
+{
+  return a + 0x0f100e10;
+}
+
+/* { dg-final { scan-assembler "add.*#252706816" } } */
+/* { dg-final { scan-assembler "add.*#3600" } } */