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When sampleFDO is enabled, people may expect they can use -fno-profile-sample-use to opt-out using sample profile for a certain file. That could be either for debugging purpose or for performance tuning purpose. However, when thinlto is enabled, if a function in file A compiled with -fno-profile-sample-use is imported to another file B compiled with -fprofile-sample-use, the inlined copy of the function in file B may still get its profile annotated. The inconsistency may even introduce profile unused warning because if the target is not compiled with explicit debug information flag, the function in file A won't have its debug information enabled (debug information will be enabled implicitly only when -fprofile-sample-use is used). After it is imported into file B which is compiled with -fprofile-sample-use, profile annotation for the outline copy of the function will fail because the function has no debug information, and that will trigger profile unused warning. We add a new attribute use-sample-profile to control whether a function will use its sample profile no matter for its outline or inline copies. That will make the behavior of -fno-profile-sample-use consistent. Differential Revision: https://reviews.llvm.org/D79959
51 lines
1.3 KiB
LLVM
51 lines
1.3 KiB
LLVM
; RUN: opt < %s -passes=inline -inline-threshold=100 -S | FileCheck %s
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;; caller1/caller2/callee1/callee2 test functions with incompatible attributes
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;; won't be inlined into each other.
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define i32 @callee1(i32 %x) {
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%x1 = add i32 %x, 1
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%x2 = add i32 %x1, 1
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%x3 = add i32 %x2, 1
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call void @extern()
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ret i32 %x3
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}
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define i32 @callee2(i32 %x) #0 {
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%x1 = add i32 %x, 1
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%x2 = add i32 %x1, 1
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%x3 = add i32 %x2, 1
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call void @extern()
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ret i32 %x3
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}
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define i32 @caller1(i32 %y1) {
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;; caller1 doesn't have use-sample-profile attribute but callee2 has,
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;; so callee2 won't be inlined into caller1.
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;; caller1 and callee1 don't have use-sample-profile attribute, so
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;; callee1 can be inlined into caller1.
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; CHECK-LABEL: @caller1(
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; CHECK: call i32 @callee2
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; CHECK-NOT: call i32 @callee1
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%y2 = call i32 @callee2(i32 %y1)
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%y3 = call i32 @callee1(i32 %y2)
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ret i32 %y3
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}
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define i32 @caller2(i32 %y1) #0 {
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;; caller2 and callee2 both have use-sample-profile attribute, so
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;; callee2 can be inlined into caller2.
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;; caller2 has use-sample-profile attribute but callee1 doesn't have,
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;; so callee1 won't be inlined into caller2.
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; CHECK-LABEL: @caller2(
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; CHECK-NOT: call i32 @callee2
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; CHECK: call i32 @callee1
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%y2 = call i32 @callee2(i32 %y1)
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%y3 = call i32 @callee1(i32 %y2)
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ret i32 %y3
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}
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declare void @extern()
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attributes #0 = { "use-sample-profile" }
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