PATCH: PR target/49002: 128-bit AVX load incorrectly becomes 256-bit AVX load

[H.J. Lu]

Hi,

This patch properly handles 256bit load cast.  OK for trunk if there
is no regression?  I will also prepare a patch for 4.6 branch.

Thanks.


H.J.
--
gcc/

2011-05-18  H.J. Lu  <hongjiu...@intel.com>

        PR target/49002
        * config/i386/sse.md 
(avx_<ssemodesuffix><avxsizesuffix>_<ssemodesuffix>):
        Properly handle load cast.

gcc/testsuite/

2011-05-18  H.J. Lu  <hongjiu...@intel.com>

        PR target/49002
        * gcc.target/i386/pr49002-1.c: New test.
        * gcc.target/i386/pr49002-2.c: Likewise.

diff --git a/gcc/config/i386/sse.md b/gcc/config/i386/sse.md
index 291bffb..cf12a6d 100644
--- a/gcc/config/i386/sse.md
+++ b/gcc/config/i386/sse.md
@@ -10294,12 +10294,13 @@
   "&& reload_completed"
   [(const_int 0)]
 {
+  rtx op0 = operands[0];
   rtx op1 = operands[1];
-  if (REG_P (op1))
+  if (REG_P (op0))
+    op0 = gen_rtx_REG (<ssehalfvecmode>mode, REGNO (op0));
+  else 
     op1 = gen_rtx_REG (<MODE>mode, REGNO (op1));
-  else
-    op1 = gen_lowpart (<MODE>mode, op1);
-  emit_move_insn (operands[0], op1);
+  emit_move_insn (op0, op1);
   DONE;
 })
 
diff --git a/gcc/testsuite/gcc.target/i386/pr49002-1.c 
b/gcc/testsuite/gcc.target/i386/pr49002-1.c
new file mode 100644
index 0000000..7553e82
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr49002-1.c
@@ -0,0 +1,16 @@
+/* PR target/49002 */
+/* { dg-do compile } */
+/* { dg-options "-O -mavx" } */
+
+#include <immintrin.h>
+
+void foo(const __m128d *from, __m256d *to, int s)
+{
+  __m256d var = _mm256_castpd128_pd256(from[0]);
+  var = _mm256_insertf128_pd(var, from[s], 1);
+  to[0] = var;
+}
+
+/* Ensure we load into xmm, not ymm.  */
+/* { dg-final { scan-assembler-not "vmovapd\[\t \]*\[^,\]*,\[\t \]*%ymm" } } */
+/* { dg-final { scan-assembler "vmovapd\[\t \]*\[^,\]*,\[\t \]*%xmm" } } */
diff --git a/gcc/testsuite/gcc.target/i386/pr49002-2.c 
b/gcc/testsuite/gcc.target/i386/pr49002-2.c
new file mode 100644
index 0000000..b0e1009
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr49002-2.c
@@ -0,0 +1,14 @@
+/* PR target/49002 */
+/* { dg-do compile } */
+/* { dg-options "-O -mavx" } */
+
+#include <immintrin.h>
+
+void foo(const __m128d from, __m256d *to)
+{
+  *to = _mm256_castpd128_pd256(from);
+}
+
+/* Ensure we store ymm, not xmm.  */
+/* { dg-final { scan-assembler-not "vmovapd\[\t \]*%xmm\[0-9\]\+,\[^,\]*" } } 
*/
+/* { dg-final { scan-assembler "vmovapd\[\t \]*%ymm\[0-9\]\+,\[^,\]*" } } */