43907d608a
If we have a writeonly function called from a callsite with a potentially reading operand bundle, we can not conclude the callsite is writeonly. The changed test is the only one I've been able to demonstrate a current miscompile on, but an incorrect result here could show up in a bunch of subtle ways. For instance, this issue caused several spurious test changes when combined with D117591.
51 lines
1.3 KiB
LLVM
51 lines
1.3 KiB
LLVM
; RUN: opt -S -function-attrs < %s -enable-new-pm=0 | FileCheck %s
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declare void @f_readonly() readonly
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declare void @f_readnone() readnone
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declare void @f_writeonly() writeonly
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define void @test_0(i32* %x) {
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; FunctionAttrs must not infer readonly / readnone for %x
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; CHECK-LABEL: define void @test_0(i32* %x) #3 {
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entry:
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; CHECK: call void @f_readonly() [ "foo"(i32* %x) ]
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call void @f_readonly() [ "foo"(i32* %x) ]
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ret void
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}
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define void @test_1(i32* %x) {
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; FunctionAttrs must not infer readonly / readnone for %x
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; CHECK-LABEL: define void @test_1(i32* %x) #4 {
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entry:
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; CHECK: call void @f_readnone() [ "foo"(i32* %x) ]
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call void @f_readnone() [ "foo"(i32* %x) ]
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ret void
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}
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define void @test_2(i32* %x) {
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; FunctionAttrs must not infer writeonly
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; CHECK-LABEL: define void @test_2(i32* %x) {
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entry:
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; CHECK: call void @f_writeonly() [ "foo"(i32* %x) ]
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call void @f_writeonly() [ "foo"(i32* %x) ]
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ret void
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}
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define void @test_3(i32* %x) {
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; The "deopt" operand bundle does not capture or write to %x.
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; CHECK-LABEL: define void @test_3(i32* nocapture readonly %x)
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entry:
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call void @f_readonly() [ "deopt"(i32* %x) ]
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ret void
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}
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; CHECK: attributes #0 = { nofree readonly }
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; CHECK: attributes #1 = { nofree nosync readnone }
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; CHECK: attributes #2 = { writeonly }
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; CHECK: attributes #3 = { nofree }
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; CHECK: attributes #4 = { nofree nosync }
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