65fd034b95
If a function doesn't contain loops and does not call non-willreturn functions, then it is willreturn. Loops are detected by checking for backedges in the function. We don't attempt to handle finite loops at this point. Differential Revision: https://reviews.llvm.org/D94633
26 lines
586 B
LLVM
26 lines
586 B
LLVM
; RUN: opt < %s -function-attrs -S | FileCheck %s
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; RUN: opt < %s -passes=function-attrs -S | FileCheck %s
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@x = global i32 0
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define void @test_opt(i8* %p) {
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; CHECK-LABEL: @test_opt
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; CHECK: (i8* nocapture readnone %p) #0 {
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ret void
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}
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define void @test_optnone(i8* %p) noinline optnone {
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; CHECK-LABEL: @test_optnone
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; CHECK: (i8* %p) #1 {
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ret void
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}
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declare i8 @strlen(i8*) noinline optnone
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; CHECK-LABEL: @strlen
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; CHECK: (i8*) #1
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; CHECK-LABEL: attributes #0
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; CHECK: = { norecurse nounwind readnone willreturn }
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; CHECK-LABEL: attributes #1
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; CHECK: = { noinline optnone }
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