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29 lines
1.1 KiB
LLVM
29 lines
1.1 KiB
LLVM
; Test to make sure unused llvm.invariant.start calls are not trivially eliminated
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; RUN: opt < %s -instcombine -S | FileCheck %s
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declare void @g(i8*)
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declare void @g_addr1(i8 addrspace(1)*)
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declare {}* @llvm.invariant.start.p0i8(i64, i8* nocapture) nounwind readonly
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declare {}* @llvm.invariant.start.p1i8(i64, i8 addrspace(1)* nocapture) nounwind readonly
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define i8 @f() {
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%a = alloca i8 ; <i8*> [#uses=4]
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store i8 0, i8* %a
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%i = call {}* @llvm.invariant.start.p0i8(i64 1, i8* %a) ; <{}*> [#uses=0]
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; CHECK: call {}* @llvm.invariant.start.p0i8
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call void @g(i8* %a)
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%r = load i8, i8* %a ; <i8> [#uses=1]
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ret i8 %r
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}
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; make sure llvm.invariant.call in non-default addrspace are also not eliminated.
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define i8 @f_addrspace1(i8 addrspace(1)* %a) {
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store i8 0, i8 addrspace(1)* %a
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%i = call {}* @llvm.invariant.start.p1i8(i64 1, i8 addrspace(1)* %a) ; <{}*> [#uses=0]
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; CHECK: call {}* @llvm.invariant.start.p1i8
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call void @g_addr1(i8 addrspace(1)* %a)
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%r = load i8, i8 addrspace(1)* %a ; <i8> [#uses=1]
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ret i8 %r
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}
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