https://bugs.llvm.org/show_bug.cgi?id=47404
Bug ID: 47404
Summary: Failure to detect pblendvb pattern
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: X86
Assignee: unassignedb...@nondot.org
Reporter: gabrav...@gmail.com
CC: craig.top...@gmail.com, llvm-bugs@lists.llvm.org,
llvm-...@redking.me.uk, spatel+l...@rotateright.com
typedef char v16i8 __attribute__((vector_size(16)));
v16i8 blend_epi8(v16i8 x, v16i8 y, v16i8 mask)
{
v16i8 tmp = (mask < 0);
return (v16i8)((~tmp & x) | (tmp & y));
}
This can can be optimized to `return __builtin_ia32_pblendvb128(x, y, mask);`.
This transformation is done by GCC, but not by LLVM.
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