Existing splitter is not able to split const_vector 0 as
general_operand predicate matches only scalar zeros.
2018-10-10 Uros Bizjak <[email protected]>
PR target/87573
* config/i386/mmx.md (const_vector 0 -> mem splitter): New splitter.
testsuite/ChangeLog:
2018-10-10 Uros Bizjak <[email protected]>
PR target/87573
* gcc.target/i386/pr87573.c: New test.
Bootstrapped and regression tested on x86_64-linux-gnu {,-m32}.
Committed to mainline SVN.
Uros.
Index: config/i386/mmx.md
===================================================================
--- config/i386/mmx.md (revision 265018)
+++ config/i386/mmx.md (working copy)
@@ -217,11 +217,18 @@
(define_split
[(set (match_operand:MMXMODE 0 "nonimmediate_gr_operand")
- (match_operand:MMXMODE 1 "general_gr_operand"))]
+ (match_operand:MMXMODE 1 "nonimmediate_gr_operand"))]
"!TARGET_64BIT && reload_completed"
[(const_int 0)]
"ix86_split_long_move (operands); DONE;")
+(define_split
+ [(set (match_operand:MMXMODE 0 "nonimmediate_gr_operand")
+ (match_operand:MMXMODE 1 "const0_operand"))]
+ "!TARGET_64BIT && reload_completed"
+ [(const_int 0)]
+ "ix86_split_long_move (operands); DONE;")
+
(define_expand "movmisalign<mode>"
[(set (match_operand:MMXMODE 0 "nonimmediate_operand")
(match_operand:MMXMODE 1 "nonimmediate_operand"))]
Index: testsuite/gcc.target/i386/pr87573.c
===================================================================
--- testsuite/gcc.target/i386/pr87573.c (nonexistent)
+++ testsuite/gcc.target/i386/pr87573.c (working copy)
@@ -0,0 +1,12 @@
+/* PR target/87573 */
+/* { dg-do compile { target ia32 } } */
+/* { dg-options "-O1 -mmmx -mno-sse" } */
+
+typedef char __v8qi __attribute__((vector_size(8)));
+
+__v8qi e;
+
+void f (void)
+{
+ e = (__v8qi) {0, 0, 0, 0, 0, 0, 0, 0};
+}
