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| author | Vedant Kumar <vsk@apple.com> | 2018-03-02 22:46:48 +0000 |
|---|---|---|
| committer | Vedant Kumar <vsk@apple.com> | 2018-03-02 22:46:48 +0000 |
| commit | f69baf64ebc546681b296d8f339a11de2c411642 (patch) | |
| tree | e694109b088b601d84f2b81d13e7068dc5dcc27b /llvm/lib/Transforms/Utils/Local.cpp | |
| parent | 235354be57e3b9933f9454e964b8fbe12663dfbb (diff) | |
| download | bcm5719-llvm-f69baf64ebc546681b296d8f339a11de2c411642.tar.gz bcm5719-llvm-f69baf64ebc546681b296d8f339a11de2c411642.zip | |
[Utils] Salvage debug info in block simplification
In stage2 -O3 builds of llc, this results in small but measurable
increases in the number of variables with locations, and in the number
of unique source variables overall.
(According to llvm-dwarfdump --statistics, there are 123 additional
variables with locations, which is just a 0.006% improvement).
The size of the .debug_loc section of the llc dsym increases by 0.004%.
llvm-svn: 326629
Diffstat (limited to 'llvm/lib/Transforms/Utils/Local.cpp')
| -rw-r--r-- | llvm/lib/Transforms/Utils/Local.cpp | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/llvm/lib/Transforms/Utils/Local.cpp b/llvm/lib/Transforms/Utils/Local.cpp index 1fd85a83e0a..1bfa1be50e9 100644 --- a/llvm/lib/Transforms/Utils/Local.cpp +++ b/llvm/lib/Transforms/Utils/Local.cpp @@ -504,6 +504,8 @@ simplifyAndDCEInstruction(Instruction *I, const DataLayout &DL, const TargetLibraryInfo *TLI) { if (isInstructionTriviallyDead(I, TLI)) { + salvageDebugInfo(*I); + // Null out all of the instruction's operands to see if any operand becomes // dead as we go. for (unsigned i = 0, e = I->getNumOperands(); i != e; ++i) { |
