From 90db942b2752c1fea3a3b6f4a623710e1b88abd7 Mon Sep 17 00:00:00 2001
From: Richard Sandiford <rsandifo@redhat.com>
Date: Wed, 19 Nov 2003 08:23:43 +0000
Subject: [PATCH] emit-rtl.c (gen_lowpart): Don't force MEMs into a register
unless the register lowpart is a...
* emit-rtl.c (gen_lowpart): Don't force MEMs into a register unless
the register lowpart is a TRULY_NOOP_TRUNCATION.
From-SVN: r73731
---
gcc/ChangeLog | 5 +++++
gcc/emit-rtl.c | 2 ++
2 files changed, 7 insertions(+)
diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 931f74c2aeb8..9c1b245aee8c 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2003-11-19 Richard SAndiford <rsandifo@redhat.com>
+
+ * emit-rtl.c (gen_lowpart): Don't force MEMs into a register unless
+ the register lowpart is a TRULY_NOOP_TRUNCATION.
+
2003-11-19 Richard Henderson <rth@redhat.com>
* config/i386/i386.c (print_reg): Handle QI and HI modes for
diff --git a/gcc/emit-rtl.c b/gcc/emit-rtl.c
index 9c50e2371fd6..a528641a6f98 100644
--- a/gcc/emit-rtl.c
+++ b/gcc/emit-rtl.c
@@ -1356,6 +1356,8 @@ gen_lowpart (enum machine_mode mode, rtx x)
/* The following exposes the use of "x" to CSE. */
if (GET_MODE_SIZE (GET_MODE (x)) <= UNITS_PER_WORD
&& SCALAR_INT_MODE_P (GET_MODE (x))
+ && TRULY_NOOP_TRUNCATION (GET_MODE_BITSIZE (mode),
+ GET_MODE_BITSIZE (GET_MODE (x)))
&& ! no_new_pseudos)
return gen_lowpart (mode, force_reg (GET_MODE (x), x));
--
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