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| author | Ian Levesque <ianlevesque@fb.com> | 2020-01-17 13:24:16 -0800 |
|---|---|---|
| committer | Shoaib Meenai <smeenai@fb.com> | 2020-01-17 13:32:24 -0800 |
| commit | 1d62be244108547558c6d42ddcf2e4a7f3c6dd03 (patch) | |
| tree | 7a3f11b861fed03556b00191773ce5f37a2929f3 /clang/lib/CodeGen/CodeGenFunction.cpp | |
| parent | 7628e474a5916ed8a43c015248443f4c03077509 (diff) | |
| download | llvm-1d62be244108547558c6d42ddcf2e4a7f3c6dd03.zip llvm-1d62be244108547558c6d42ddcf2e4a7f3c6dd03.tar.gz llvm-1d62be244108547558c6d42ddcf2e4a7f3c6dd03.tar.bz2 | |
[clang][xray] Add -fxray-ignore-loops option
XRay allows tuning by minimum function size, but also always instruments
functions with loops in them. If the minimum function size is set to a
large value the loop instrumention ends up causing most functions to be
instrumented anyway. This adds a new flag, -fxray-ignore-loops, to disable
the loop detection logic.
Differential Revision: https://reviews.llvm.org/D72873
Diffstat (limited to 'clang/lib/CodeGen/CodeGenFunction.cpp')
| -rw-r--r-- | clang/lib/CodeGen/CodeGenFunction.cpp | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/clang/lib/CodeGen/CodeGenFunction.cpp b/clang/lib/CodeGen/CodeGenFunction.cpp index 2bf94f6..75f5c0e 100644 --- a/clang/lib/CodeGen/CodeGenFunction.cpp +++ b/clang/lib/CodeGen/CodeGenFunction.cpp @@ -818,6 +818,9 @@ void CodeGenFunction::StartFunction(GlobalDecl GD, QualType RetTy, Fn->addFnAttr( "xray-instruction-threshold", llvm::itostr(CGM.getCodeGenOpts().XRayInstructionThreshold)); + if (CGM.getCodeGenOpts().XRayIgnoreLoops) { + Fn->addFnAttr("xray-ignore-loops"); + } } if (const auto *Attr = D->getAttr<PatchableFunctionEntryAttr>()) { |