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
31 lines
1.1 KiB
LLVM
31 lines
1.1 KiB
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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; CHECK: define void @nouses-argworn-funrn(i32* nocapture readnone %.aaa) #0 {
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define void @nouses-argworn-funrn(i32* writeonly %.aaa) {
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nouses-argworn-funrn_entry:
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ret void
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}
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; CHECK: define void @nouses-argworn-funro(i32* nocapture readnone %.aaa, i32* nocapture readonly %.bbb) #1 {
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define void @nouses-argworn-funro(i32* writeonly %.aaa, i32* %.bbb) {
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nouses-argworn-funro_entry:
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%val = load i32 , i32* %.bbb
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ret void
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}
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%_type_of_d-ccc = type <{ i8*, i8, i8, i8, i8 }>
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@d-ccc = internal global %_type_of_d-ccc <{ i8* null, i8 1, i8 13, i8 0, i8 -127 }>, align 8
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; CHECK: define void @nouses-argworn-funwo(i32* nocapture readnone %.aaa) #2 {
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define void @nouses-argworn-funwo(i32* writeonly %.aaa) {
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nouses-argworn-funwo_entry:
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store i8 0, i8* getelementptr inbounds (%_type_of_d-ccc, %_type_of_d-ccc* @d-ccc, i32 0, i32 3)
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ret void
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}
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; CHECK: attributes #0 = { {{.*}} readnone {{.*}} }
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; CHECK: attributes #1 = { {{.*}} readonly {{.*}} }
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; CHECK: attributes #2 = { {{.*}} writeonly }
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