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

	* 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

gcc/ChangeLog

+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

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

gcc/testsuite/ChangeLog

+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

gcc/testsuite/gcc.target/i386/sse-4.c

+/* 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));
+}