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
33 lines
1.1 KiB
LLVM
33 lines
1.1 KiB
LLVM
; RUN: opt -S -o - -function-attrs %s | FileCheck %s
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; RUN: opt -S -o - -passes=function-attrs %s | FileCheck %s
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; Verify we remove argmemonly/inaccessiblememonly/inaccessiblemem_or_argmemonly
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; function attributes when we derive readnone.
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; Function Attrs: argmemonly
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define i32* @given_argmem_infer_readnone(i32* %p) #0 {
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; CHECK: define i32* @given_argmem_infer_readnone(i32* readnone returned %p) #0 {
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entry:
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ret i32* %p
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}
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; Function Attrs: inaccessiblememonly
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define i32* @given_inaccessible_infer_readnone(i32* %p) #1 {
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; CHECK: define i32* @given_inaccessible_infer_readnone(i32* readnone returned %p) #0 {
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entry:
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ret i32* %p
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}
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; Function Attrs: inaccessiblemem_or_argmemonly
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define i32* @given_inaccessible_or_argmem_infer_readnone(i32* %p) #2 {
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; CHECK: define i32* @given_inaccessible_or_argmem_infer_readnone(i32* readnone returned %p) #0 {
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entry:
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ret i32* %p
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}
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attributes #0 = { argmemonly }
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attributes #1 = { inaccessiblememonly }
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attributes #2 = { inaccessiblemem_or_argmemonly }
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; CHECK: attributes #0 = { norecurse nounwind readnone willreturn }
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; CHECK-NOT: attributes
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