Compiler error when converting from vector of 2x32 to 2x64-bit int on POWER7

[llvmbot]

Bugzilla Link	50893
Resolution	FIXED
Resolved on	Jul 16, 2021 05:50
Version	trunk
OS	Windows NT
Reporter	LLVM Bugzilla Contributor
CC	@nemanjai
Fixed by commit(s)	6a06dba

Extended Description

Reduced test case (on Compiler Explorer: https://godbolt.org/z/z84YY6G35):

#include <stdint.h>

typedef int32_t i32x2 attribute((vector_size(8)));
typedef int64_t i64x2 attribute((vector_size(16)));

i64x2 cvt(i32x2 a) {
return __builtin_convertvector(a, i64x2);
}

Looks like it started with clang 11.0; 10 works.

[llvmbot]

Sorry, I forgot to mention in the comment: make sure -mcpu=power7 is in the compiler flags. -mcpu=power6 and -mcpu=power8 both work.

[nemanjai]

Fixed in 6a06dba.