From c0a8a3e6fd651e4c835ca75864390c92efe9b9b7 Mon Sep 17 00:00:00 2001
From: Richard Sandiford <rdsandiford@googlemail.com>
Date: Sun, 3 Feb 2013 11:13:51 +0000
Subject: [PATCH] expmed.c (extract_bit_field_1): Pass the full width of the
structure to get_best_reg_extraction_insn.
gcc/
* expmed.c (extract_bit_field_1): Pass the full width of the
structure to get_best_reg_extraction_insn.
From-SVN: r195692
---
gcc/ChangeLog | 5 +++++
gcc/expmed.c | 6 +++++-
2 files changed, 10 insertions(+), 1 deletion(-)
diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 8af4967c7183..b12b46590c6c 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2013-02-03 Richard Sandiford <rdsandiford@googlemail.com>
+
+ * expmed.c (extract_bit_field_1): Pass the full width of the
+ structure to get_best_reg_extraction_insn.
+
2013-02-01 David Edelsohn <dje.gcc@gmail.com>
PR target/54601
diff --git a/gcc/expmed.c b/gcc/expmed.c
index da37e6b81850..4a6ddb06b110 100644
--- a/gcc/expmed.c
+++ b/gcc/expmed.c
@@ -1569,7 +1569,11 @@ extract_bit_field_1 (rtx str_rtx, unsigned HOST_WIDE_INT bitsize,
enum extraction_pattern pattern = unsignedp ? EP_extzv : EP_extv;
extraction_insn extv;
if (!MEM_P (op0)
- && get_best_reg_extraction_insn (&extv, pattern, bitnum + bitsize,
+ /* ??? We could limit the structure size to the part of OP0 that
+ contains the field, with appropriate checks for endianness
+ and TRULY_NOOP_TRUNCATION. */
+ && get_best_reg_extraction_insn (&extv, pattern,
+ GET_MODE_BITSIZE (GET_MODE (op0)),
tmode))
{
rtx result = extract_bit_field_using_extv (&extv, op0, bitsize, bitnum,
--
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