rs6000: Fix up __m64 typedef in mmintrin.h [PR97301]

The x86 __m64 type is defined as: /* The Intel API is flexible enough that we must allow aliasing with other vector types, and their scalar components. */ typedef int __m64 __attribute__ ((__vector_size__ (8), __may_alias__)); and so matches the comment above it in that reads and stores through pointers to __m64 can alias anything. But in the rs6000 headers that is the case only for __m128, but not __m64. The following patch adds that attribute, which fixes the FAIL: gcc.target/powerpc/sse-movhps-1.c execution test FAIL: gcc.target/powerpc/sse-movlps-1.c execution test regressions that appeared when Honza improved ipa-modref. 2021-01-23 Jakub Jelinek <[email protected]> PR testsuite/97301 * config/rs6000/mmintrin.h (__m64): Add __may_alias__ attribute.
Geod24 · Jan 23, 2021 · c63f091 · c63f091
1 parent a8cef3c
commit c63f091
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/gcc/config/rs6000/mmintrin.h b/gcc/config/rs6000/mmintrin.h
@@ -58,7 +58,8 @@
 #include <altivec.h>
 /* The Intel API is flexible enough that we must allow aliasing with other
    vector types, and their scalar components.  */
-typedef __attribute__ ((__aligned__ (8))) unsigned long long __m64;
+typedef __attribute__ ((__aligned__ (8),
+			__may_alias__)) unsigned long long __m64;
 
 typedef __attribute__ ((__aligned__ (8)))
 union