[llvm-bugs] [Bug 47404] New: Failure to detect pblendvb pattern

[via llvm-bugs]

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: unassignedbugs at nondot.org
          Reporter: gabravier at gmail.com
                CC: craig.topper at gmail.com, llvm-bugs at lists.llvm.org,
                    llvm-dev at redking.me.uk, spatel+llvm at 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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