forked from OSchip/llvm-project
20 lines
970 B
LLVM
20 lines
970 B
LLVM
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; RUN: opt < %s -datalayout -instcombine -S | FileCheck %s
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; Uses InstCombine with DataLayout to propagate dereferenceable
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; attribute via gc.relocate: if the derived ptr is dereferenceable(N),
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; then the return attribute of gc.relocate is dereferenceable(N).
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declare zeroext i1 @return_i1()
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declare i32 @llvm.experimental.gc.statepoint.p0f_i1f(i1 ()*, i32, i32, ...)
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declare i32 addrspace(1)* @llvm.experimental.gc.relocate.p1i32(i32, i32, i32)
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define i32 addrspace(1)* @deref(i32 addrspace(1)* dereferenceable(8) %dparam) {
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; Checks that a dereferenceabler pointer
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; CHECK-LABEL: @deref
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; CHECK: call dereferenceable(8)
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entry:
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%load = load i32 addrspace(1)* %dparam
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%tok = tail call i32 (i1 ()*, i32, i32, ...)* @llvm.experimental.gc.statepoint.p0f_i1f(i1 ()* @return_i1, i32 0, i32 0, i32 0, i32 addrspace(1)* %dparam)
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%relocate = call i32 addrspace(1)* @llvm.experimental.gc.relocate.p1i32(i32 %tok, i32 4, i32 4)
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ret i32 addrspace(1)* %relocate
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}
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