51 lines
1.5 KiB
LLVM
51 lines
1.5 KiB
LLVM
; RUN: opt -inline -S < %s | FileCheck %s
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; The callee guarantees that the pointer argument is nonnull and dereferenceable.
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; That information should transfer to the caller.
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define i32 @callee(i32* dereferenceable(32) %t1) {
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; CHECK-LABEL: @callee(i32* dereferenceable(32) %t1)
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; CHECK-NEXT: [[T2:%.*]] = load i32, i32* %t1
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; CHECK-NEXT: ret i32 [[T2]]
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;
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%t2 = load i32, i32* %t1
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ret i32 %t2
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}
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; FIXME: All dereferenceability information is lost.
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; The caller argument could be known nonnull and dereferenceable(32).
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define i32 @caller1(i32* %t1) {
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; CHECK-LABEL: @caller1(i32* %t1)
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; CHECK-NEXT: [[T2_I:%.*]] = load i32, i32* %t1
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; CHECK-NEXT: ret i32 [[T2_I]]
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;
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%t2 = tail call i32 @callee(i32* dereferenceable(32) %t1)
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ret i32 %t2
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}
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; The caller argument is nonnull, but that can be explicit.
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; The dereferenceable amount could be increased.
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define i32 @caller2(i32* dereferenceable(31) %t1) {
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; CHECK-LABEL: @caller2(i32* dereferenceable(31) %t1)
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; CHECK-NEXT: [[T2_I:%.*]] = load i32, i32* %t1
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; CHECK-NEXT: ret i32 [[T2_I]]
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;
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%t2 = tail call i32 @callee(i32* dereferenceable(32) %t1)
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ret i32 %t2
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}
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; The caller argument is nonnull, but that can be explicit.
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; Make sure that we don't propagate a smaller dereferenceable amount.
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define i32 @caller3(i32* dereferenceable(33) %t1) {
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; CHECK-LABEL: @caller3(i32* dereferenceable(33) %t1)
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; CHECK-NEXT: [[T2_I:%.*]] = load i32, i32* %t1
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; CHECK-NEXT: ret i32 [[T2_I]]
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;
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%t2 = tail call i32 @callee(i32* dereferenceable(32) %t1)
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ret i32 %t2
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}
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