b95689933f
GCC's leaf attribute is lowered to LLVM IR nocallback attribute. Clang conservatively treats this function attribute as a hint on the module level, and removes it while linking modules. More context can be found in: https://reviews.llvm.org/D131628. Differential Revision: https://reviews.llvm.org/D137360
45 lines
2.1 KiB
LLVM
45 lines
2.1 KiB
LLVM
; RUN: llvm-link %s %p/Inputs/drop-attribute.ll -S -o - | FileCheck %s
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; Test case that checks that nocallback attribute is dropped during linking.
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; CHECK: define i32 @main()
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; CHECK-NEXT: entry:
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; CHECK-NEXT: call void @test_nocallback_definition()
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; Test that checks that nocallback attribute on a call-site is dropped.
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; CHECK-NEXT: call void @test_nocallback_call_site(){{$}}
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; CHECK-NEXT: %0 = call float @llvm.sqrt.f32(float undef)
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; CHECK-NEXT: call void @test_nocallback_declaration_definition_not_linked_in()
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; CHECK-NEXT: call void @test_nocallback_declaration_definition_linked_in()
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define i32 @main() {
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entry:
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call void @test_nocallback_definition()
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call void @test_nocallback_call_site() nocallback
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call float @llvm.sqrt.f32(float undef)
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call void @test_nocallback_declaration_definition_not_linked_in()
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call void @test_nocallback_declaration_definition_linked_in()
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ret i32 0
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}
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; Test that checks that nocallback attribute on a definition is dropped.
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; CHECK: define void @test_nocallback_definition()
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define void @test_nocallback_definition() nocallback {
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ret void
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}
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; Test that checks that nocallback attribute on a declaration when a definition is linked in is dropped.
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; CHECK: declare void @test_nocallback_call_site(){{$}}
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declare void @test_nocallback_call_site()
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; Test that checks that nocallback attribute on an intrinsic is NOT dropped.
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; CHECK: ; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn
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; CHECK-NEXT: declare float @llvm.sqrt.f32(float) #0
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declare float @llvm.sqrt.f32(float) nocallback
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; Test that checks that nocallback attribute on a declaration when a definition is not linked in is dropped.
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; CHECK: declare void @test_nocallback_declaration_definition_not_linked_in(){{$}}
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declare void @test_nocallback_declaration_definition_not_linked_in() nocallback
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; Test that checks that nocallback attribute on a declaration when a definition is linked in is dropped.
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; CHECK: define void @test_nocallback_declaration_definition_linked_in() {{{$}}
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declare void @test_nocallback_declaration_definition_linked_in() nocallback
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