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99ca015392
Teach LLVM optimize to more precisely in the presence of "deopt" operand bundles. "deopt" operand bundles imply that the call they're attached to is at least `readonly` (i.e. they don't imply clobber semantics), and they don't capture their bundle operands. llvm-svn: 254118
34 lines
860 B
LLVM
34 lines
860 B
LLVM
; RUN: opt -S -functionattrs < %s | FileCheck %s
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declare void @f_readonly() readonly
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declare void @f_readnone() readnone
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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) {
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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) {
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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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; The "deopt" operand bundle does not capture or write to %x.
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; CHECK-LABEL: define void @test_2(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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