[all-commits] [llvm/llvm-project] 256ad9: AMDGPU: Reuse carry out register during FI elimina...
Austin Kerbow via All-commits
all-commits at lists.llvm.org
Thu Nov 28 10:16:50 PST 2019
Branch: refs/heads/master
Home: https://github.com/llvm/llvm-project
Commit: 256ad954a9e453e55b950207ca433da8da883a33
https://github.com/llvm/llvm-project/commit/256ad954a9e453e55b950207ca433da8da883a33
Author: Austin Kerbow <Austin.Kerbow at amd.com>
Date: 2019-11-28 (Thu, 28 Nov 2019)
Changed paths:
M llvm/lib/Target/AMDGPU/SIInstrInfo.cpp
M llvm/lib/Target/AMDGPU/SIRegisterInfo.cpp
M llvm/test/CodeGen/AMDGPU/pei-scavenge-sgpr-carry-out.mir
Log Message:
-----------
AMDGPU: Reuse carry out register during FI elimination
Summary:
Pre gfx9 we need to scavenge a 64-bit SGPR to use as the carry out for an Add.
If only one SGPR was available this crashed when trying to scavenge another
32bit SGPR to materialize the offset.
Instead, reuse a 32-bit SGPR from the carry out as the offset register.
Also prefer to use vcc for the unused carry out when it is available.
Reviewers: arsenm, rampitec
Subscribers: kzhuravl, jvesely, wdng, nhaehnle, yaxunl, dstuttard, tpr, t-tye, hiraditya, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D70614
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