https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96912
Bug ID: 96912
Summary: Failure to optimize pattern
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: gabravier at gmail dot com
Target Milestone: ---
typedef char v16i8 __attribute__((vector_size(16)));
typedef int64_t v2i64 __attribute__((vector_size(16)));
v2i64 blend_epi8(v2i64 x, v2i64 y, v16i8 mask)
{
v2i64 tmp = (mask < 0);
return (~tmp & x) | (tmp & y);
}
This can be optimized to `return (v2i64)__builtin_ia32_pblendvb128((v16i8)x,
(v16i8)y, mask);`. This transformation is done by LLVM, but not by GCC.
