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| author | Matt Davis <Matthew.Davis@sony.com> | 2018-03-19 16:06:40 +0000 |
|---|---|---|
| committer | Matt Davis <Matthew.Davis@sony.com> | 2018-03-19 16:06:40 +0000 |
| commit | 4b54e5fc386e5aa62725efe893d8ac9b9ee1dd01 (patch) | |
| tree | ab404b6142c29a0976fee270af56a6d88632e1f8 /llvm/lib/DebugInfo/CodeView/DebugStringTableSubsection.cpp | |
| parent | 5cca20f825e66eea684d5fb8c8303ee2b32456b4 (diff) | |
| download | llvm-4b54e5fc386e5aa62725efe893d8ac9b9ee1dd01.zip llvm-4b54e5fc386e5aa62725efe893d8ac9b9ee1dd01.tar.gz llvm-4b54e5fc386e5aa62725efe893d8ac9b9ee1dd01.tar.bz2 | |
[CodeGen] Avoid handling DBG_VALUE in the LivePhysRegs (addUses,removeDefs,stepForward)
Summary:
This patch prevents DBG_VALUE instructions from influencing
LivePhysRegs::stepBackwards and stepForwards. In at least one case,
specifically branch folding, the stepBackwards logic was having an
influence on code generation. The result was that certain code
compiled with '-g -O2' would differ from that compiled with '-O2'
alone. It seems that the original logic, accounting for DBG_VALUE,
was influencing the placement of an IMPLICIT_DEF which had a later
impact on how blocks were processed in branch folding.
Reviewers: kparzysz, MatzeB
Reviewed By: kparzysz
Subscribers: bjope, llvm-commits
Tags: #debug-info
Differential Revision: https://reviews.llvm.org/D43850
llvm-svn: 327862
Diffstat (limited to 'llvm/lib/DebugInfo/CodeView/DebugStringTableSubsection.cpp')
0 files changed, 0 insertions, 0 deletions