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This reverts commit 0dc6c249bffac9f23a605ce4e42a84341da3ddbd.
The commit is reported to cause a regression in piglit/bin/glsl-vs-loop for
Mesa.
(cherry picked from commit a80291ce10ba9667352adcc895f9668144f5f616)
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The current implementation of skip insertion (SIInsertSkip) makes it a
mandatory pass required for correctness. Initially, the idea was to
have an optional pass. This patch inserts the s_cbranch_execz upfront
during SILowerControlFlow to skip over the sections of code when no
lanes are active. Later, SIRemoveShortExecBranches removes the skips
for short branches, unless there is a sideeffect and the skip branch is
really necessary.
This new pass will replace the handling of skip insertion in the
existing SIInsertSkip Pass.
Differential revision: https://reviews.llvm.org/D68092
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values according to the divergence.'
Detailed description:
After https://reviews.llvm.org/D59990 submit several issues were discovered.
Changes in common code were preserved but AMDGPU specific part was reverted to keep the backend working correctly.
Discovered issues were addressed in the following commits:
https://reviews.llvm.org/D67662
https://reviews.llvm.org/D67101
https://reviews.llvm.org/D63953
https://reviews.llvm.org/D63731
This change brings back AMDGPU specific changes.
Reviewed by: rampitec, arsenm
Differential Revision: https://reviews.llvm.org/D68635
llvm-svn: 374767
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Summary:
Add test checking that the redundant immediate MOV instruction
(by-product of handling phi nodes) is not found in the generated code.
Reviewers: arsenm, anton-afanasyev, craig.topper, rtereshin, bogner
Reviewed By: arsenm
Subscribers: kzhuravl, yaxunl, dstuttard, tpr, t-tye, wdng, jvesely, nhaehnle, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D63860
llvm-svn: 370634
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