From 2d523c23175b8e8772c2e223d92513f836cde8a6 Mon Sep 17 00:00:00 2001
From: Eric Andersen <andersen@codepoet.org>
Date: Sat, 9 Oct 2004 01:06:03 +0000
Subject: Major buildroot facelift, step one.  -Erik

---
 .../gcc/3.4.2/600-gcc34-arm-ldm-peephole.patch     | 79 ++++++++++++++++++++++
 1 file changed, 79 insertions(+)
 create mode 100644 toolchain/gcc/3.4.2/600-gcc34-arm-ldm-peephole.patch

(limited to 'toolchain/gcc/3.4.2/600-gcc34-arm-ldm-peephole.patch')

diff --git a/toolchain/gcc/3.4.2/600-gcc34-arm-ldm-peephole.patch b/toolchain/gcc/3.4.2/600-gcc34-arm-ldm-peephole.patch
new file mode 100644
index 000000000..fb317e153
--- /dev/null
+++ b/toolchain/gcc/3.4.2/600-gcc34-arm-ldm-peephole.patch
@@ -0,0 +1,79 @@
+--- gcc-3.4.0/gcc/config/arm/arm.md.arm-ldm-peephole	2004-01-13 08:24:37.000000000 -0500
++++ gcc-3.4.0/gcc/config/arm/arm.md	2004-04-24 18:18:04.000000000 -0400
+@@ -8810,13 +8810,16 @@
+    (set_attr "length" "4,8,8")]
+ )
+ 
++; Try to convert LDR+LDR+arith into [add+]LDM+arith
++; On XScale, LDM is always slower than two LDRs, so only do this if
++; optimising for size.
+ (define_insn "*arith_adjacentmem"
+   [(set (match_operand:SI 0 "s_register_operand" "=r")
+ 	(match_operator:SI 1 "shiftable_operator"
+ 	 [(match_operand:SI 2 "memory_operand" "m")
+ 	  (match_operand:SI 3 "memory_operand" "m")]))
+    (clobber (match_scratch:SI 4 "=r"))]
+-  "TARGET_ARM && adjacent_mem_locations (operands[2], operands[3])"
++  "TARGET_ARM && (!arm_tune_xscale || optimize_size) && adjacent_mem_locations (operands[2], operands[3])"
+   "*
+   {
+     rtx ldm[3];
+@@ -8851,6 +8854,8 @@
+       }
+    if (val1 && val2)
+       {
++	/* This would be a loss on a Harvard core, but adjacent_mem_locations()
++	   will prevent it from happening.  */
+ 	rtx ops[3];
+ 	ldm[0] = ops[0] = operands[4];
+ 	ops[1] = XEXP (XEXP (operands[2], 0), 0);
+--- gcc-3.4.0/gcc/config/arm/arm.c.arm-ldm-peephole	2004-04-24 18:16:25.000000000 -0400
++++ gcc-3.4.0/gcc/config/arm/arm.c	2004-04-24 18:18:04.000000000 -0400
+@@ -4593,8 +4593,11 @@
+ 	 arith_adjacentmem pattern to output an overlong sequence.  */
+       if (!const_ok_for_op (PLUS, val0) || !const_ok_for_op (PLUS, val1))
+ 	return 0;
+-      
+-      return (reg0 == reg1) && ((val1 - val0) == 4 || (val0 - val1) == 4);
++
++      /* For Harvard cores, only accept pairs where one offset is zero.
++         See comment in load_multiple_sequence.  */
++      return (reg0 == reg1) && ((val1 - val0) == 4 || (val0 - val1) == 4)
++	&& (!arm_ld_sched || val0 == 0 || val1 == 0);
+     }
+   return 0;
+ }
+@@ -4838,6 +4841,11 @@
+       *load_offset = unsorted_offsets[order[0]];
+     }
+ 
++  /* For XScale a two-word LDM is a performance loss, so only do this if
++     size is more important.  See comments in arm_gen_load_multiple.  */
++  if (nops == 2 && arm_tune_xscale && !optimize_size)
++    return 0;
++
+   if (unsorted_offsets[order[0]] == 0)
+     return 1; /* ldmia */
+ 
+@@ -5064,6 +5072,11 @@
+       *load_offset = unsorted_offsets[order[0]];
+     }
+ 
++  /* For XScale a two-word LDM is a performance loss, so only do this if
++     size is more important.  See comments in arm_gen_load_multiple.  */
++  if (nops == 2 && arm_tune_xscale && !optimize_size)
++    return 0;
++
+   if (unsorted_offsets[order[0]] == 0)
+     return 1; /* stmia */
+ 
+--- gcc-3.4.0/gcc/genpeep.c.arm-ldm-peephole	2003-07-05 01:27:22.000000000 -0400
++++ gcc-3.4.0/gcc/genpeep.c	2004-04-24 18:18:04.000000000 -0400
+@@ -381,6 +381,7 @@
+   printf ("#include \"recog.h\"\n");
+   printf ("#include \"except.h\"\n\n");
+   printf ("#include \"function.h\"\n\n");
++  printf ("#include \"flags.h\"\n\n");
+ 
+   printf ("#ifdef HAVE_peephole\n");
+   printf ("extern rtx peep_operand[];\n\n");
-- 
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