From 32f2ce029997a7d1d4be975ddafd7dcf6574d49c Mon Sep 17 00:00:00 2001
From: Hans-Peter Nilsson <hp@bitrange.com>
Date: Fri, 31 Dec 2004 16:24:48 +0000
Subject: [PATCH] re PR target/18701 (mmix-knuth-mmixware gcc.c-torture/execute
failures: 20010224-1.c, 20020216-1.c, 20040218-1.c, 20040709-2.c)
PR target/18701
* combine.c (gen_lowpart_for_combine): When stripping SUBREG of
MEM, adjust imode and isize.
From-SVN: r92760
---
gcc/ChangeLog | 6 ++++++
gcc/combine.c | 10 +++++++++-
2 files changed, 15 insertions(+), 1 deletion(-)
diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index f6d95d3d98a4..81d0b997c414 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2004-12-31 Hans-Peter Nilsson <hp@bitrange.com>
+
+ PR target/18701
+ * combine.c (gen_lowpart_for_combine): When stripping SUBREG of
+ MEM, adjust imode and isize.
+
2004-12-30 Richard Henderson <rth@redhat.com>
* config/ia64/ia64.c (hfa_element_mode): Return false for
diff --git a/gcc/combine.c b/gcc/combine.c
index 800e65ea1006..61b93dd30489 100644
--- a/gcc/combine.c
+++ b/gcc/combine.c
@@ -9355,8 +9355,16 @@ gen_lowpart_for_combine (enum machine_mode omode, rtx x)
if (GET_CODE (x) == SUBREG && MEM_P (SUBREG_REG (x)))
{
x = SUBREG_REG (x);
- if (GET_MODE (x) == omode)
+
+ /* For use in case we fall down into the address adjustments
+ further below, we need to adjust the known mode and size of
+ x; imode and isize, since we just adjusted x. */
+ imode = GET_MODE (x);
+
+ if (imode == omode)
return x;
+
+ isize = GET_MODE_SIZE (imode);
}
result = gen_lowpart_common (omode, x);
--
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