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029032693f
If we can show that the base pointers of two GEPs don't alias each other using precise analysis and the indices and base offset are equal then the two GEPs also don't alias each other. This is primarily needed for the follow up patch that analyses NoAlias'ing PHI nodes. Part 1/2 of fix for PR13564. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163317 91177308-0d34-0410-b5e6-96231b3b80d8
55 lines
1.7 KiB
LLVM
55 lines
1.7 KiB
LLVM
; RUN: opt < %s -basicaa -aa-eval -print-all-alias-modref-info -disable-output 2>&1 | FileCheck %s
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target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
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; Check that geps with equal base offsets of noalias base pointers stay noalias.
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define i32 @test(i32* %p, i16 %i) {
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%pi = getelementptr i32* %p, i32 0
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%pi.next = getelementptr i32* %p, i32 1
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%b = icmp eq i16 %i, 0
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br i1 %b, label %bb1, label %bb2
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bb1:
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%f = getelementptr i32* %pi, i32 1
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%g = getelementptr i32* %pi.next, i32 1
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br label %bb3
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bb2:
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%f2 = getelementptr i32* %pi, i32 1
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%g2 = getelementptr i32* %pi.next, i32 1
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br label %bb3
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bb3:
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%ptr_phi = phi i32* [ %f, %bb1 ], [ %f2, %bb2 ]
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%ptr_phi2 = phi i32* [ %g, %bb1 ], [ %g2, %bb2 ]
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; CHECK: NoAlias: i32* %f1, i32* %g1
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%f1 = getelementptr i32* %ptr_phi , i32 1
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%g1 = getelementptr i32* %ptr_phi2 , i32 1
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ret i32 0
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}
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; Check that geps with equal indices of noalias base pointers stay noalias.
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define i32 @test2([2 x i32]* %p, i32 %i) {
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%pi = getelementptr [2 x i32]* %p, i32 0
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%pi.next = getelementptr [2 x i32]* %p, i32 1
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%b = icmp eq i32 %i, 0
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br i1 %b, label %bb1, label %bb2
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bb1:
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%f = getelementptr [2 x i32]* %pi, i32 1
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%g = getelementptr [2 x i32]* %pi.next, i32 1
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br label %bb3
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bb2:
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%f2 = getelementptr [2 x i32]* %pi, i32 1
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%g2 = getelementptr [2 x i32]* %pi.next, i32 1
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br label %bb3
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bb3:
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%ptr_phi = phi [2 x i32]* [ %f, %bb1 ], [ %f2, %bb2 ]
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%ptr_phi2 = phi [2 x i32]* [ %g, %bb1 ], [ %g2, %bb2 ]
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; CHECK: NoAlias: i32* %f1, i32* %g1
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%f1 = getelementptr [2 x i32]* %ptr_phi , i32 1, i32 %i
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%g1 = getelementptr [2 x i32]* %ptr_phi2 , i32 1, i32 %i
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ret i32 0
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}
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