[LLVMbugs] [Bug 17172] [SLP vectorization] missed opportunity to use absolute value vector instruction (vpabsd)

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=17172

Sanjay Patel <spatel+llvm at rotateright.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |spatel+llvm at rotateright.com
         Resolution|---                         |FIXED

--- Comment #7 from Sanjay Patel <spatel+llvm at rotateright.com> ---
This got fixed in the SLP vectorizer / cost-model sometime in the last year:

$ ./clang -v
clang version 3.6.0 (221222)
Target: x86_64-apple-darwin13.4.0
Thread model: posix


$ ./clang -O3 -fomit-frame-pointer -march=corei7-avx vpsad.c -S -o -
    .section    __TEXT,__text,regular,pure_instructions
    .macosx_version_min 10, 9
    .globl    _foo
    .align    4, 0x90
_foo:                                   ## @foo
    .cfi_startproc
## BB#0:                                ## %entry
    vpabsd    (%rdi), %xmm0
    vmovdqu    %xmm0, (%rdi)
    retq

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