19c07afe17
Summary: Deduce dereferenceable attribute in Attributor. These will be added in a later patch. * dereferenceable(_or_null)_globally (D61652) * Deduction based on load instruction (similar to D64258) Reviewers: jdoerfert, sstefan1 Reviewed By: jdoerfert Subscribers: hiraditya, jfb, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D64876 llvm-svn: 366788
53 lines
2.0 KiB
LLVM
53 lines
2.0 KiB
LLVM
; RUN: opt -attributor --attributor-disable=false -S < %s | FileCheck %s --check-prefixes=ATTRIBUTOR
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; TEST 1
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; take mininimum of return values
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;
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define i32* @test1(i32* dereferenceable(4), double* dereferenceable(8), i1 zeroext) local_unnamed_addr {
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; ATTRIBUTOR: define nonnull dereferenceable(4) i32* @test1(i32* nonnull dereferenceable(4), double* nonnull dereferenceable(8), i1 zeroext)
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%4 = bitcast double* %1 to i32*
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%5 = select i1 %2, i32* %0, i32* %4
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ret i32* %5
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}
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; TEST 2
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define i32* @test2(i32* dereferenceable_or_null(4), double* dereferenceable(8), i1 zeroext) local_unnamed_addr {
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; ATTRIBUTOR: define dereferenceable_or_null(4) i32* @test2(i32* dereferenceable_or_null(4), double* nonnull dereferenceable(8), i1 zeroext)
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%4 = bitcast double* %1 to i32*
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%5 = select i1 %2, i32* %0, i32* %4
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ret i32* %5
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}
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; TEST 3
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; GEP inbounds
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define i32* @test3_1(i32* dereferenceable(8)) local_unnamed_addr {
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; ATTRIBUTOR: define nonnull dereferenceable(4) i32* @test3_1(i32* nonnull dereferenceable(8))
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%ret = getelementptr inbounds i32, i32* %0, i64 1
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ret i32* %ret
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}
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define i32* @test3_2(i32* dereferenceable_or_null(32)) local_unnamed_addr {
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; FIXME: Argument should be mark dereferenceable because of GEP `inbounds`.
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; ATTRIBUTOR: define nonnull dereferenceable(16) i32* @test3_2(i32* dereferenceable_or_null(32))
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%ret = getelementptr inbounds i32, i32* %0, i64 4
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ret i32* %ret
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}
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define i32* @test3_3(i32* dereferenceable(8), i32* dereferenceable(16), i1) local_unnamed_addr {
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; ATTRIBUTOR: define nonnull dereferenceable(4) i32* @test3_3(i32* nonnull dereferenceable(8), i32* nonnull dereferenceable(16), i1) local_unnamed_addr
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%ret1 = getelementptr inbounds i32, i32* %0, i64 1
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%ret2 = getelementptr inbounds i32, i32* %1, i64 2
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%ret = select i1 %2, i32* %ret1, i32* %ret2
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ret i32* %ret
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}
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; TEST 4
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; Better than known in IR.
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define dereferenceable(4) i32* @test4(i32* dereferenceable(8)) local_unnamed_addr {
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; ATTRIBUTOR: define nonnull dereferenceable(8) i32* @test4(i32* nonnull returned dereferenceable(8))
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ret i32* %0
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}
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