From c2e0ce216797712a6ce774670ff6753428d2f16a Mon Sep 17 00:00:00 2001
From: nemet <nemet@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Tue, 14 Feb 2006 07:10:35 +0000
Subject: [PATCH] * simplify-rtx.c (simplify_unary_operation_1)
<TRUNCATE>: Return new expression in the requested machine mode.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@110959 138bc75d-0d04-0410-961f-82ee72b054a4
---
gcc/ChangeLog | 5 +++++
gcc/simplify-rtx.c | 7 ++++---
2 files changed, 9 insertions(+), 3 deletions(-)
diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 6ffd3321150b..ca77775196a9 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2006-02-13 Adam Nemet <anemet@caviumnetworks.com>
+
+ * simplify-rtx.c (simplify_unary_operation_1) <TRUNCATE>: Return
+ new expression in the requested machine mode.
+
2006-02-13 Roger Sayle <roger@eyesopen.com>
* optabs.c (expand_abs): Don't call do_jump_by_parts_greater_rtx
diff --git a/gcc/simplify-rtx.c b/gcc/simplify-rtx.c
index 4cdbad754edf..c949dea1d160 100644
--- a/gcc/simplify-rtx.c
+++ b/gcc/simplify-rtx.c
@@ -609,12 +609,13 @@ simplify_unary_operation_1 (enum rtx_code code, enum machine_mode mode, rtx op)
return simplify_gen_unary (GET_CODE (op), mode,
XEXP (XEXP (op, 0), 0), mode);
- /* (truncate:SI (subreg:DI (truncate:SI X) 0)) is
- (truncate:SI x). */
+ /* (truncate:A (subreg:B (truncate:C X) 0)) is
+ (truncate:A X). */
if (GET_CODE (op) == SUBREG
&& GET_CODE (SUBREG_REG (op)) == TRUNCATE
&& subreg_lowpart_p (op))
- return SUBREG_REG (op);
+ return simplify_gen_unary (TRUNCATE, mode, XEXP (SUBREG_REG (op), 0),
+ GET_MODE (XEXP (SUBREG_REG (op), 0)));
/* If we know that the value is already truncated, we can
replace the TRUNCATE with a SUBREG if TRULY_NOOP_TRUNCATION
--
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