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| author | Betul Buyukkurt <betulb@codeaurora.org> | 2016-04-13 18:52:19 +0000 |
|---|---|---|
| committer | Betul Buyukkurt <betulb@codeaurora.org> | 2016-04-13 18:52:19 +0000 |
| commit | bf8554c27976709a056005f10cb8ce4568ccd060 (patch) | |
| tree | f4cadaae3f2b18acd90e499565d219e726b4db8b /llvm/test/Transforms/ADCE | |
| parent | 87bcae366daf2cd690b2fc2711a7908be40b2bcf (diff) | |
| download | bcm5719-llvm-bf8554c27976709a056005f10cb8ce4568ccd060.tar.gz bcm5719-llvm-bf8554c27976709a056005f10cb8ce4568ccd060.zip | |
[PGO] Remove redundant VP instrumentation
LLVM optimization passes may reduce a profiled target expression
to a constant. Removing runtime calls at such instrumentation points
would help speedup the runtime of the instrumented program.
llvm-svn: 266229
Diffstat (limited to 'llvm/test/Transforms/ADCE')
| -rw-r--r-- | llvm/test/Transforms/ADCE/delete-profiling-calls-to-constant.ll | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/llvm/test/Transforms/ADCE/delete-profiling-calls-to-constant.ll b/llvm/test/Transforms/ADCE/delete-profiling-calls-to-constant.ll new file mode 100644 index 00000000000..a61e8f8cacc --- /dev/null +++ b/llvm/test/Transforms/ADCE/delete-profiling-calls-to-constant.ll @@ -0,0 +1,19 @@ +; RUN: opt < %s -adce | FileCheck %s +; RUN: opt < %s -passes=adce | FileCheck %s + +; Verify that a call to instrument a constant is deleted. + +@__profc_foo = private global [1 x i64] zeroinitializer, section "__llvm_prf_cnts", align 8 +@__profd_foo = private global { i64, i64, i64*, i8*, i8*, i32, [1 x i16] } { i64 6699318081062747564, i64 0, i64* getelementptr inbounds ([1 x i64], [1 x i64]* @__profc_foo, i32 0, i32 0), i8* bitcast (i32 ()* @foo to i8*), i8* null, i32 1, [1 x i16] [i16 1] }, section "__llvm_prf_data", align 8 + +define i32 @foo() { +; CHECK-NOT: __llvm_profile_instrument_target +entry: + tail call void @__llvm_profile_instrument_target(i64 ptrtoint (i32 (i32)* @bar to i64), i8* bitcast ({ i64, i64, i64*, i8*, i8*, i32, [1 x i16] }* @__profd_foo to i8*), i32 0) + %call = tail call i32 @bar(i32 21) + ret i32 %call +} + +declare i32 @bar(i32) + +declare void @__llvm_profile_instrument_target(i64, i8*, i32) |
