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From: Michael Olbrich <m.olbrich@pengutronix.de>
Date: Tue, 1 Nov 2011 18:25:07 +0100
Subject: [PATCH] fix arith_adjacentmem LDM splitting code
This is http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39429
This is the patch fromt the gcc bugzilla.
Signed-off-by: Robert Schwebel <r.schwebel@pengutronix.de>
---
gcc/config/arm/arm.md | 15 +++++++++++++++
1 files changed, 15 insertions(+), 0 deletions(-)
diff --git a/gcc/config/arm/arm.md b/gcc/config/arm/arm.md
index cc6d34b..b5d0d05 100644
--- a/gcc/config/arm/arm.md
+++ b/gcc/config/arm/arm.md
@@ -9869,6 +9869,21 @@
else
{
/* Offset is out of range for a single add, so use two ldr. */
+
+ /* Swap the ldrs if the first ldr would clobber the shared base_reg. */
+ if (REGNO (ldm[1]) == REGNO (base_reg))
+ {
+ rtx tmp_reg;
+ HOST_WIDE_INT tmp_val;
+
+ tmp_reg = ldm[1];
+ ldm[1] = ldm[2];
+ ldm[2] = tmp_reg;
+ tmp_val = val1;
+ val1 = val2;
+ val2 = tmp_val;
+ }
+
ops[0] = ldm[1];
ops[1] = base_reg;
ops[2] = GEN_INT (val1);
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