Hi!
No matter whether LRA (if it is a bug in there) is fixed or not,
*vec_concatv2df could handle for !avx sse3 x <- x, 1 alternative the same
as it handles x <- m, 1 alternative (using movddup).
Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?
2013-01-08 Jakub Jelinek <ja...@redhat.com>
PR rtl-optimization/55829
* config/i386/sse.md (*vec_concatv2df): Add x <- x, 1 alternative
for sse3 but not avx.
* gcc.target/i386/pr55829.c: New test.
--- gcc/config/i386/sse.md.jj 2012-11-26 10:14:26.000000000 +0100
+++ gcc/config/i386/sse.md 2013-01-08 10:28:42.496819712 +0100
@@ -5183,10 +5183,10 @@ (define_insn "vec_dupv2df"
(set_attr "mode" "V2DF")])
(define_insn "*vec_concatv2df"
- [(set (match_operand:V2DF 0 "register_operand" "=x,x,x,x,x,x,x,x")
+ [(set (match_operand:V2DF 0 "register_operand" "=x,x,x, x,x,x,x,x")
(vec_concat:V2DF
- (match_operand:DF 1 "nonimmediate_operand" " 0,x,m,0,x,m,0,0")
- (match_operand:DF 2 "vector_move_operand" " x,x,1,m,m,C,x,m")))]
+ (match_operand:DF 1 "nonimmediate_operand" " 0,x,xm,0,x,m,0,0")
+ (match_operand:DF 2 "vector_move_operand" " x,x,1, m,m,C,x,m")))]
"TARGET_SSE"
"@
unpcklpd\t{%2, %0|%0, %2}
--- gcc/testsuite/gcc.target/i386/pr55829.c.jj 2013-01-08 10:34:41.490778873
+0100
+++ gcc/testsuite/gcc.target/i386/pr55829.c 2013-01-08 10:35:24.591532010
+0100
@@ -0,0 +1,23 @@
+/* PR rtl-optimization/55829 */
+/* { dg-do compile } */
+/* { dg-options "-O2 -msse3 -fno-expensive-optimizations" } */
+
+typedef double V __attribute__ ((__vector_size__ (16)));
+extern double v[], w[];
+int foo (void);
+
+int
+bar (void)
+{
+ int i, f = 0;
+ V t1 = (V) { *v, 0 };
+ V t2 = __builtin_ia32_shufpd (t1, t1, 0);
+ double p10 = v[0];
+ for (i = 0; i < 80; i++)
+ {
+ w[0] = p10;
+ __builtin_ia32_storeupd (v, t2);
+ f += foo ();
+ }
+ return f;
+}
Jakub
