File pr36438.diff of Package gcc43

2008-06-06 Uros Bizjak <ubizjak@gmail.com>

	PR rtl-optimization/36438
	* cse.c (fold_rtx) [ASHIFT, LSHIFTRT, ASHIFTRT]: Break out early
	for vector shifts with constant scalar shift operands.
 
Index: gcc/testsuite/gcc.target/i386/pr36438.c
===================================================================
--- gcc/testsuite/gcc.target/i386/pr36438.c	(revision 0)
+++ gcc/testsuite/gcc.target/i386/pr36438.c	(revision 136486)
@@ -0,0 +1,19 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -mmmx" } */
+
+#include <mmintrin.h>
+
+extern __m64 SetS16 (unsigned short, unsigned short,
+		     unsigned short, unsigned short);
+
+void foo(__m64* dest)
+{
+  __m64 mask = SetS16 (0x00FF, 0xFF00, 0x0000, 0x00FF);
+
+  mask = _mm_slli_si64(mask, 8);
+  mask = _mm_slli_si64(mask, 8);
+
+  *dest = mask;
+
+  _mm_empty ();
+}
Index: gcc/cse.c
===================================================================
--- gcc/cse.c	(revision 136485)
+++ gcc/cse.c	(revision 136486)
@@ -3489,6 +3489,11 @@ fold_rtx (rtx x, rtx insn)
 			  && exact_log2 (- INTVAL (const_arg1)) >= 0)))
 		break;
 
+	      /* ??? Vector mode shifts by scalar
+		 shift operand are not supported yet.  */
+	      if (is_shift && VECTOR_MODE_P (mode))
+                break;
+
 	      if (is_shift
 		  && (INTVAL (inner_const) >= GET_MODE_BITSIZE (mode)
 		      || INTVAL (inner_const) < 0))