From ad4ecfda33b1120e3a632c9d29015496e5b923e2 Mon Sep 17 00:00:00 2001
From: jakub <jakub@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Tue, 21 Feb 2006 08:09:08 +0000
Subject: [PATCH] 	PR middle-end/26379 	* combine.c
 (simplify_shift_const_1): Disable nested shifts 	optimization for
 vector shifts.

	* gcc.target/i386/mmx-7.c: New test.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@111328 138bc75d-0d04-0410-961f-82ee72b054a4
---
 gcc/ChangeLog                         |  6 ++++++
 gcc/combine.c                         |  3 ++-
 gcc/testsuite/ChangeLog               |  5 +++++
 gcc/testsuite/gcc.target/i386/mmx-7.c | 18 ++++++++++++++++++
 4 files changed, 31 insertions(+), 1 deletion(-)
 create mode 100644 gcc/testsuite/gcc.target/i386/mmx-7.c

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 0349d92cb0b..eee818bb408 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2006-02-21  Jakub Jelinek  <jakub@redhat.com>
+
+	PR middle-end/26379
+	* combine.c (simplify_shift_const_1): Disable nested shifts
+	optimization for vector shifts.
+
 2006-02-20  Roger Sayle  <roger@eyesopen.com>
 
 	PR tree-optimization/26361
diff --git a/gcc/combine.c b/gcc/combine.c
index 96ebd208a82..9240b32568a 100644
--- a/gcc/combine.c
+++ b/gcc/combine.c
@@ -8737,7 +8737,8 @@ simplify_shift_const_1 (enum rtx_code code, enum machine_mode result_mode,
 	      && INTVAL (XEXP (varop, 1)) >= 0
 	      && INTVAL (XEXP (varop, 1)) < GET_MODE_BITSIZE (GET_MODE (varop))
 	      && GET_MODE_BITSIZE (result_mode) <= HOST_BITS_PER_WIDE_INT
-	      && GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_WIDE_INT)
+	      && GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_WIDE_INT
+	      && !VECTOR_MODE_P (result_mode))
 	    {
 	      enum rtx_code first_code = GET_CODE (varop);
 	      unsigned int first_count = INTVAL (XEXP (varop, 1));
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index cf2d999a326..266489f9450 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2006-02-21  Jakub Jelinek  <jakub@redhat.com>
+
+	PR middle-end/26379
+	* gcc.target/i386/mmx-7.c: New test.
+
 2006-02-20  Roger Sayle  <roger@eyesopen.com>
 
 	PR tree-optimization/26361
diff --git a/gcc/testsuite/gcc.target/i386/mmx-7.c b/gcc/testsuite/gcc.target/i386/mmx-7.c
new file mode 100644
index 00000000000..683ca102d8a
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/mmx-7.c
@@ -0,0 +1,18 @@
+/* PR middle-end/26379 */
+/* { dg-do compile } */
+/* { dg-options "-O2 -mmmx" } */
+
+#include <mmintrin.h>
+
+void
+foo (__m64 *p)
+{
+  __m64 m;
+
+  m = p[0];
+  m = _mm_srli_pi16(m, 2);
+  m = _mm_slli_pi16(m, 8);
+
+  p[0] = m;
+  _mm_empty();
+}
-- 
2.11.4.GIT