[llvm] r251612 - [PGO] Do not emit runtime hook user function for Linux
Xinliang David Li via llvm-commits
llvm-commits at lists.llvm.org
Wed Oct 28 21:08:31 PDT 2015
Author: davidxl
Date: Wed Oct 28 23:08:31 2015
New Revision: 251612
URL: http://llvm.org/viewvc/llvm-project?rev=251612&view=rev
Log:
[PGO] Do not emit runtime hook user function for Linux
Clang driver now injects -u<hook_var> flag in the linker
command line, in which case user function is not needed
any more.
Differential Revision: http://reviews.llvm.org/D14033
Modified:
llvm/trunk/lib/Transforms/Instrumentation/InstrProfiling.cpp
llvm/trunk/test/Instrumentation/InstrProfiling/linkage.ll
Modified: llvm/trunk/lib/Transforms/Instrumentation/InstrProfiling.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Instrumentation/InstrProfiling.cpp?rev=251612&r1=251611&r2=251612&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/Instrumentation/InstrProfiling.cpp (original)
+++ llvm/trunk/lib/Transforms/Instrumentation/InstrProfiling.cpp Wed Oct 28 23:08:31 2015
@@ -288,6 +288,11 @@ void InstrProfiling::emitRegistration()
void InstrProfiling::emitRuntimeHook() {
+ // We expect the linker to be invoked with -u<hook_var> flag for linux,
+ // for which case there is no need to emit the user function.
+ if (Triple(M->getTargetTriple()).isOSLinux())
+ return;
+
// If the module's provided its own runtime, we don't need to do anything.
if (M->getGlobalVariable(getInstrProfRuntimeHookVarName())) return;
Modified: llvm/trunk/test/Instrumentation/InstrProfiling/linkage.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Instrumentation/InstrProfiling/linkage.ll?rev=251612&r1=251611&r2=251612&view=diff
==============================================================================
--- llvm/trunk/test/Instrumentation/InstrProfiling/linkage.ll (original)
+++ llvm/trunk/test/Instrumentation/InstrProfiling/linkage.ll Wed Oct 28 23:08:31 2015
@@ -1,36 +1,36 @@
;; Check that runtime symbols get appropriate linkage.
-; RUN: opt < %s -mtriple=x86_64-apple-macosx10.10.0 -instrprof -S | FileCheck %s
-; RUN: opt < %s -mtriple=x86_64-unknown-linux -instrprof -S | FileCheck %s
+; RUN: opt < %s -mtriple=x86_64-apple-macosx10.10.0 -instrprof -S | FileCheck %s --check-prefix=OTHER --check-prefix=COMMON
+; RUN: opt < %s -mtriple=x86_64-unknown-linux -instrprof -S | FileCheck %s --check-prefix=LINUX --check-prefix=COMMON
@__llvm_profile_name_foo = hidden constant [3 x i8] c"foo"
@__llvm_profile_name_foo_weak = weak hidden constant [8 x i8] c"foo_weak"
@"__llvm_profile_name_linkage.ll:foo_internal" = internal constant [23 x i8] c"linkage.ll:foo_internal"
@__llvm_profile_name_foo_inline = linkonce_odr hidden constant [10 x i8] c"foo_inline"
-; CHECK: @__llvm_profile_counters_foo = hidden global
-; CHECK: @__llvm_profile_data_foo = hidden constant
+; COMMON: @__llvm_profile_counters_foo = hidden global
+; COMMON: @__llvm_profile_data_foo = hidden constant
define void @foo() {
call void @llvm.instrprof.increment(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @__llvm_profile_name_foo, i32 0, i32 0), i64 0, i32 1, i32 0)
ret void
}
-; CHECK: @__llvm_profile_counters_foo_weak = weak hidden global
-; CHECK: @__llvm_profile_data_foo_weak = weak hidden constant
+; COMMON: @__llvm_profile_counters_foo_weak = weak hidden global
+; COMMON: @__llvm_profile_data_foo_weak = weak hidden constant
define weak void @foo_weak() {
call void @llvm.instrprof.increment(i8* getelementptr inbounds ([8 x i8], [8 x i8]* @__llvm_profile_name_foo_weak, i32 0, i32 0), i64 0, i32 1, i32 0)
ret void
}
-; CHECK: @"__llvm_profile_counters_linkage.ll:foo_internal" = internal global
-; CHECK: @"__llvm_profile_data_linkage.ll:foo_internal" = internal constant
+; COMMON: @"__llvm_profile_counters_linkage.ll:foo_internal" = internal global
+; COMMON: @"__llvm_profile_data_linkage.ll:foo_internal" = internal constant
define internal void @foo_internal() {
call void @llvm.instrprof.increment(i8* getelementptr inbounds ([23 x i8], [23 x i8]* @"__llvm_profile_name_linkage.ll:foo_internal", i32 0, i32 0), i64 0, i32 1, i32 0)
ret void
}
-; CHECK: @__llvm_profile_counters_foo_inline = linkonce_odr hidden global
-; CHECK: @__llvm_profile_data_foo_inline = linkonce_odr hidden constant
+; COMMON: @__llvm_profile_counters_foo_inline = linkonce_odr hidden global
+; COMMON: @__llvm_profile_data_foo_inline = linkonce_odr hidden constant
define linkonce_odr void @foo_inline() {
call void @llvm.instrprof.increment(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @__llvm_profile_name_foo_inline, i32 0, i32 0), i64 0, i32 1, i32 0)
ret void
@@ -38,9 +38,12 @@ define linkonce_odr void @foo_inline() {
declare void @llvm.instrprof.increment(i8*, i64, i32, i32)
-; CHECK: @__llvm_profile_runtime = external global i32
+; OTHER: @__llvm_profile_runtime = external global i32
+; LINUX-NOT: @__llvm_profile_runtime = external global i32
-; CHECK: define linkonce_odr hidden i32 @__llvm_profile_runtime_user() {{.*}} {
-; CHECK: %[[REG:.*]] = load i32, i32* @__llvm_profile_runtime
-; CHECK: ret i32 %[[REG]]
-; CHECK: }
+; OTHER: define linkonce_odr hidden i32 @__llvm_profile_runtime_user() {{.*}} {
+; OTHER: %[[REG:.*]] = load i32, i32* @__llvm_profile_runtime
+; OTHER: ret i32 %[[REG]]
+; OTHER: }
+; LINUX-NOT: define linkonce_odr hidden i32 @__llvm_profile_runtime_user() {{.*}} {
+; LINUX-NOT: %[[REG:.*]] = load i32, i32* @__llvm_profile_runtime
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