re PR target/42881 (SSE2 intrinsics miscompiled at -O0 -march=k8)

	PR target/42881
	* config/i386/i386.c (ix86_expand_vector_init_duplicate):
	Wrap force_reg into a sequence, emit it before user.

testsuite/
	* gcc.target/i386/pr42881.c: New test.

From-SVN: r156320

gcc/ChangeLog

+2010-01-28  Michael Matz  <matz@suse.de>
+
+	PR target/42881
+	* config/i386/i386.c (ix86_expand_vector_init_duplicate):
+	Wrap force_reg into a sequence, emit it before user.
+
 2010-01-28  Stephen Thomas  <stephen.thomas@arm.com>
 
 	* config/arm/arm.md (bswapsi2): Add support for bswapsi2.

gcc/config/i386/i386.c

@@ -26644,8 +26644,16 @@ ix86_expand_vector_init_duplicate (bool mmx_ok, enum machine_mode mode,
 	insn = emit_insn (gen_rtx_SET (VOIDmode, target, dup));
 	if (recog_memoized (insn) < 0)
 	  {
+	    rtx seq;
 	    /* If that fails, force VAL into a register.  */
+
+	    start_sequence ();
 	    XEXP (dup, 0) = force_reg (GET_MODE_INNER (mode), val);
+	    seq = get_insns ();
+	    end_sequence ();
+	    if (seq)
+	      emit_insn_before (seq, insn);
+
 	    ok = recog_memoized (insn) >= 0;
 	    gcc_assert (ok);
 	  }

gcc/testsuite/ChangeLog

+2010-01-28  Michael Matz  <matz@suse.de>
+
+	* gcc.target/i386/pr42881.c: New test.
+
 2010-01-28  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
 
 	* gcc.misc-tests/linkage.exp: Remove mips-sgi-irix6*o32 support.

gcc/testsuite/gcc.target/i386/pr42881.c

+/* PR target/42881 */
+/* { dg-do run } */
+/* { dg-options "-O0 -msse" } */
+#include "sse-check.h"
+#include <xmmintrin.h>
+static void
+sse_test (void)
+{
+  double a[2];
+  __m128d x = _mm_set1_pd(3);
+  _mm_storeu_pd(a,x);
+  if (a[0] != 3.0 || a[1] != 3.0)
+    __builtin_abort ();
+}