From: Uros Bizjak <ubizjak@gmail.com>
Date: Sat, 18 Jul 2015 11:36:32 +0000 (+0200)
Subject: re PR target/66922 (wrong code for bit-field struct at -O1 and above on x86_64-linux... 
X-Git-Tag: releases/gcc-4.9.4~692
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1504c6a206b6f31174da607c047058965ef39a2e;p=thirdparty%2Fgcc.git

re PR target/66922 (wrong code for bit-field struct at -O1 and above on x86_64-linux-gnu)

	PR target/66922
	* config/i386/i386.c (ix86_expand_pinsr): Reject insertions
	to misaligned positions.

testsuite/ChangeLog:

	PR target/66922
	* gcc.target/i386/pr66922.c: New test.

From-SVN: r225982
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index e895ed07a851..cc3a787968ff 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2015-07-18  Uros Bizjak  <ubizjak@gmail.com>
+
+	PR target/66922
+	* config/i386/i386.c (ix86_expand_pinsr): Reject insertions
+	to misaligned positions.
+
 2015-07-17  Uros Bizjak  <ubizjak@gmail.com>
 
 	PR target/66866
diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index 7fc19e6b95d6..704e98639620 100644
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -45381,6 +45381,10 @@ ix86_expand_pinsr (rtx *operands)
 	    return false;
 	  }
 
+	/* Reject insertions to misaligned positions.  */
+	if (pos & (size-1))
+	  return false;
+
 	rtx d = dst;
 	if (GET_MODE (dst) != dstmode)
 	  d = gen_reg_rtx (dstmode);
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 72bb72703bd9..3f601cbc81e0 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2015-07-18  Uros Bizjak  <ubizjak@gmail.com>
+
+	PR target/66922
+	* gcc.target/i386/pr66922.c: New test.
+
 2015-07-17  Uros Bizjak  <ubizjak@gmail.com>
 
 	PR target/66866
diff --git a/gcc/testsuite/gcc.target/i386/pr66922.c b/gcc/testsuite/gcc.target/i386/pr66922.c
new file mode 100644
index 000000000000..46274b22ce87
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr66922.c
@@ -0,0 +1,23 @@
+/* { dg-do run } */
+/* { dg-options "-O1 -msse2" } */
+/* { dg-require-effective-target sse2 } */
+
+#include "sse2-check.h"
+
+struct S 
+{
+  int:31;
+  int:2;
+  int f0:16;
+  int f1;
+  int f2;
+};
+
+static void 
+sse2_test (void)
+{
+  struct S a = { 1, 0, 0 };
+
+  if (a.f0 != 1)
+    __builtin_abort(); 
+}