simplify-rtx.c (simplify_immed_subreg): Only clear up to elem_bitsize bits, not max_b...

	* simplify-rtx.c (simplify_immed_subreg) <case CONST_DOUBLE>: Only clear
	up to elem_bitsize bits, not max_bitsize.

	* gcc.target/i386/sse-4.c: New test.

From-SVN: r103318

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 1329cf2f5819fdd2b889b5ff1a928e4f8682d6cc..90e30ae6d7b38c5ba73eb88b544cb43aaca902d5 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2005-08-21  Jakub Jelinek  <jakub@redhat.com>
+
+       * simplify-rtx.c (simplify_immed_subreg) <case CONST_DOUBLE>: Only clear
+       up to elem_bitsize bits, not max_bitsize.
+
 2005-08-21  Sebastian Pop  <pop@cri.ensmp.fr>
 
        PR tree-optimization/23433

diff --git a/gcc/simplify-rtx.c b/gcc/simplify-rtx.c
index ca9d9dab4a56fc5357c5b7390fa61fa46ace1fef..8a2faae30a6ee6907443b159d12696356cbd624f 100644 (file)
--- a/gcc/simplify-rtx.c
+++ b/gcc/simplify-rtx.c
@@ -3605,7 +3605,7 @@ simplify_immed_subreg (enum machine_mode outermode, rtx op,
                }
              /* It shouldn't matter what's done here, so fill it with
                 zero.  */
-             for (; i < max_bitsize; i += value_bit)
+             for (; i < elem_bitsize; i += value_bit)
                *vp++ = 0;
            }
          else

diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index f24894038554a1ef0efb6746a866d07e8b2b0ee5..310c782ba6f49cea5a5d65a56fa51c713f486a77 100644 (file)
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,7 @@
+2005-08-21  Jakub Jelinek  <jakub@redhat.com>
+
+       * gcc.target/i386/sse-4.c: New test.
+
 2005-08-20  John David Anglin  <dave.anglin@nrc-cnrc.gc.ca>
 
        PR testsuite/23239

diff --git a/gcc/testsuite/gcc.target/i386/sse-4.c b/gcc/testsuite/gcc.target/i386/sse-4.c
new file mode 100644 (file)
index 0000000..394ad9d
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/sse-4.c
@@ -0,0 +1,10 @@
+/* This testcase caused a buffer overflow in simplify_immed_subreg.  */
+/* { dg-do compile } */
+/* { dg-options "-O2 -msse2" } */
+
+#include <emmintrin.h>
+
+__m128i foo (__m128i x)
+{
+  return _mm_min_epu8 (x, _mm_set1_epi8 (10));
+}