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[Inline] add tests to show attribute information loss; NFC

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llvm-svn: 295209
This commit is contained in:
Sanjay Patel 2017-02-15 17:42:58 +00:00
parent 34646fef86
commit 3d1a3c399b
1 changed files with 50 additions and 0 deletions
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50
test/Transforms/Inline/arg-attr-propagation.ll Normal file
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; RUN: opt -inline -S < %s | FileCheck %s
; The callee guarantees that the pointer argument is nonnull and dereferenceable.
; That information should transfer to the caller.
define i32 @callee(i32* dereferenceable(32) %t1) {
; CHECK-LABEL: @callee(i32* dereferenceable(32) %t1)
; CHECK-NEXT: [[T2:%.*]] = load i32, i32* %t1
; CHECK-NEXT: ret i32 [[T2]]
;
%t2 = load i32, i32* %t1
ret i32 %t2
}
; FIXME: All dereferenceability information is lost.
; The caller argument could be known nonnull and dereferenceable(32).
define i32 @caller1(i32* %t1) {
; CHECK-LABEL: @caller1(i32* %t1)
; CHECK-NEXT: [[T2_I:%.*]] = load i32, i32* %t1
; CHECK-NEXT: ret i32 [[T2_I]]
;
%t2 = tail call i32 @callee(i32* dereferenceable(32) %t1)
ret i32 %t2
}
; The caller argument is nonnull, but that can be explicit.
; The dereferenceable amount could be increased.
define i32 @caller2(i32* dereferenceable(31) %t1) {
; CHECK-LABEL: @caller2(i32* dereferenceable(31) %t1)
; CHECK-NEXT: [[T2_I:%.*]] = load i32, i32* %t1
; CHECK-NEXT: ret i32 [[T2_I]]
;
%t2 = tail call i32 @callee(i32* dereferenceable(32) %t1)
ret i32 %t2
}
; The caller argument is nonnull, but that can be explicit.
; Make sure that we don't propagate a smaller dereferenceable amount.
define i32 @caller3(i32* dereferenceable(33) %t1) {
; CHECK-LABEL: @caller3(i32* dereferenceable(33) %t1)
; CHECK-NEXT: [[T2_I:%.*]] = load i32, i32* %t1
; CHECK-NEXT: ret i32 [[T2_I]]
;
%t2 = tail call i32 @callee(i32* dereferenceable(32) %t1)
ret i32 %t2
}