[PATCH] D74017: AMDGPU/EG, CM: Implement fsqrt using recip(rsqrt(x)) instead of x * rsqrt(x)
Jan Vesely via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Tue Feb 4 18:12:53 PST 2020
jvesely created this revision.
jvesely added a reviewer: arsenm.
Herald added subscribers: kerbowa, hiraditya, t-tye, tpr, dstuttard, yaxunl, nhaehnle, wdng, kzhuravl.
Herald added a project: LLVM.
The old version might be faster on EG (RECIP_IEEE is Trans only),
but it'd need extra corner case checks.
This gives correct corner case behaviour and saves a register.
Fixes OCL CTS sqrt test (1-thread, scalar) on Turks.
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D74017
Files:
llvm/lib/Target/AMDGPU/CaymanInstructions.td
llvm/lib/Target/AMDGPU/EvergreenInstructions.td
llvm/lib/Target/AMDGPU/R600Instructions.td
llvm/test/CodeGen/AMDGPU/fsqrt.ll
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