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5 Commits

Author SHA1 Message Date
Alexander Timofeev 6524a7a2b9 [AMDGPU]: PHI Elimination hooks added for custom COPY insertion. Fixed 
Defferential Revision: https://reviews.llvm.org/D67101

Reviewers: rampitec, vpykhtin
llvm-svn: 372086
 2019-09-17 09:08:58 +00:00
Alexander Timofeev 9ff70132bf Revert for: [AMDGPU]: PHI Elimination hooks added for custom COPY insertion. 
llvm-svn: 371873
 2019-09-13 17:37:30 +00:00
Michael Liao 7957d4c015 [AMDGPU] Fix crash in phi-elimination hook. 
Summary: - Pre-check in case there's just a single PHI insn.

Reviewers: alex-t, rampitec, arsenm

Subscribers: kzhuravl, jvesely, wdng, nhaehnle, dstuttard, tpr, t-tye, hiraditya, llvm-commits, yaxunl

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D67451

llvm-svn: 371649
 2019-09-11 19:55:20 +00:00
Alexander Timofeev c2d292f839 [AMDGPU]: PHI Elimination hooks added for custom COPY insertion. 
Reviewers: rampitec, vpykhtin

  Differential Revision: https://reviews.llvm.org/D67101

llvm-svn: 371508
 2019-09-10 10:58:57 +00:00
Bjorn Pettersson c2fc53ac90 [PHIElimination] Lower a PHI node with only undef uses as IMPLICIT_DEF 
Summary:
The lowering of PHI nodes used to detect if all inputs originated
from IMPLICIT_DEF's. If so the PHI node was replaced by an
IMPLICIT_DEF. Now we also consider undef uses when checking the
inputs. So if all inputs are implicitly defined or undef we
lower the PHI to an IMPLICIT_DEF. This makes
PHIElimination::LowerPHINode more consistent as it checks
both implicit and undef properties at later stages.

Reviewers: MatzeB, tstellar

Reviewed By: MatzeB

Subscribers: jvesely, nhaehnle, llvm-commits

Differential Revision: https://reviews.llvm.org/D52558

llvm-svn: 343417
 2018-09-30 17:26:58 +00:00