[PATCH] D52358: [X86][Sched] Add zero idiom sched data to the SNB model.

[Clement Courbet via Phabricator via llvm-commits]

courbet created this revision.
courbet added reviewers: RKSimon, andreadb.
Herald added a subscriber: gbedwell.

On SNB, renamer-based zeroing does not work for:

- 16 and 8-bit GPRs[1].
- MMX [2].
- ANDN variants [3]

[1] echo 'sub %ax, %ax' | /tmp/llvm-exegesis -mode=uops -snippets-file=-
[2] echo 'pxor %mm0, %mm0' | /tmp/llvm-exegesis -mode=uops -snippets-file=-
[3] echo 'andnps %xmm0, %xmm0' | /tmp/llvm-exegesis -mode=uops -snippets-file=-


Repository:
  rL LLVM

https://reviews.llvm.org/D52358

Files:
  lib/Target/X86/X86SchedSandyBridge.td
  test/CodeGen/X86/avx-schedule.ll
  test/CodeGen/X86/avx512-schedule.ll
  test/CodeGen/X86/sse-schedule.ll
  test/tools/llvm-mca/X86/SandyBridge/zero-idioms.s

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