0b09313cd5
This builds on the code from D114963, and extends it to handle calls both direct and indirect. With the revised code structure (from series of previously landed NFCs), this is pretty straight forward. One thing to note is that we can not infer writeonly for arguments which might be captured. If the pointer can be read back by the caller, and then read through, we have no way to track that. This is the same restriction we have for readonly, except that we get no mileage out of the "callee can be readonly" exception since a writeonly param on a readonly function is either a) readnone or b) UB. This means we can't actually infer much unless nocapture has already been inferred. Differential Revision: https://reviews.llvm.org/D115003
94 lines
2.3 KiB
LLVM
94 lines
2.3 KiB
LLVM
; RUN: opt < %s -basic-aa -function-attrs -rpo-function-attrs -S | FileCheck %s
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; RUN: opt < %s -aa-pipeline=basic-aa -passes='cgscc(function-attrs),rpo-function-attrs' -S | FileCheck %s
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; CHECK: Function Attrs
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; CHECK-SAME: norecurse nosync nounwind readnone
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; CHECK-NEXT: define i32 @leaf()
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define i32 @leaf() {
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ret i32 1
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}
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; CHECK: Function Attrs
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; CHECK-SAME: readnone
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; CHECK-NOT: norecurse
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; CHECK-NEXT: define i32 @self_rec()
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define i32 @self_rec() {
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%a = call i32 @self_rec()
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ret i32 4
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}
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; CHECK: Function Attrs
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; CHECK-SAME: readnone
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; CHECK-NOT: norecurse
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; CHECK-NEXT: define i32 @indirect_rec()
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define i32 @indirect_rec() {
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%a = call i32 @indirect_rec2()
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ret i32 %a
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}
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; CHECK: Function Attrs
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; CHECK-SAME: readnone
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; CHECK-NOT: norecurse
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; CHECK-NEXT: define i32 @indirect_rec2()
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define i32 @indirect_rec2() {
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%a = call i32 @indirect_rec()
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ret i32 %a
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}
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; CHECK: Function Attrs
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; CHECK-SAME: readnone
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; CHECK-NOT: norecurse
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; CHECK-NEXT: define i32 @extern()
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define i32 @extern() {
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%a = call i32 @k()
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ret i32 %a
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}
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; CHECK: Function Attrs
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; CHECK-NEXT: declare i32 @k()
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declare i32 @k() readnone
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; CHECK: Function Attrs
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; CHECK-SAME: nounwind
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; CHECK-NOT: norecurse
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; CHECK-NEXT: define void @intrinsic(i8* nocapture writeonly %dest, i8* nocapture readonly %src, i32 %len)
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define void @intrinsic(i8* %dest, i8* %src, i32 %len) {
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call void @llvm.memcpy.p0i8.p0i8.i32(i8* %dest, i8* %src, i32 %len, i1 false)
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ret void
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}
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; CHECK: Function Attrs
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; CHECK-NEXT: declare void @llvm.memcpy.p0i8.p0i8.i32
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declare void @llvm.memcpy.p0i8.p0i8.i32(i8*, i8*, i32, i1)
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; CHECK: Function Attrs
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; CHECK-SAME: norecurse nosync readnone
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; FIXME: missing "norecurse"
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; CHECK-NEXT: define internal i32 @called_by_norecurse()
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define internal i32 @called_by_norecurse() {
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%a = call i32 @k()
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ret i32 %a
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}
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; CHECK: Function Attrs
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; CHECK-NEXT: define void @m()
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define void @m() norecurse {
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%a = call i32 @called_by_norecurse()
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ret void
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}
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; CHECK: Function Attrs
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; CHECK-SAME: norecurse nosync readnone
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; FIXME: missing "norecurse"
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; CHECK-NEXT: define internal i32 @called_by_norecurse_indirectly()
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define internal i32 @called_by_norecurse_indirectly() {
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%a = call i32 @k()
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ret i32 %a
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}
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define internal void @o() {
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%a = call i32 @called_by_norecurse_indirectly()
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ret void
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}
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define void @p() norecurse {
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call void @o()
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ret void
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}
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