derek.holloway
7502bf64a4
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62 lines
1.9 KiB
LLVM
62 lines
1.9 KiB
LLVM
; RUN: opt < %s -aa-pipeline=basic-aa -passes=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(ptr %p, i16 %i) {
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; CHECK-LABEL: Function: test:
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%pi.next = getelementptr i32, ptr %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, ptr %p, i32 1
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%g = getelementptr i32, ptr %pi.next, i32 1
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br label %bb3
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bb2:
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%f2 = getelementptr i32, ptr %p, i32 1
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%g2 = getelementptr i32, ptr %pi.next, i32 1
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br label %bb3
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bb3:
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%ptr_phi = phi ptr [ %f, %bb1 ], [ %f2, %bb2 ]
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%ptr_phi2 = phi ptr [ %g, %bb1 ], [ %g2, %bb2 ]
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; CHECK: NoAlias: i32* %f1, i32* %g1
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%f1 = getelementptr i32, ptr %ptr_phi , i32 1
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%g1 = getelementptr i32, ptr %ptr_phi2 , i32 1
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; This should also work if the access size is not the same.
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; CHECK: NoAlias: i32* %f1, i16* %g1
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load i32, ptr %f1
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load i32, ptr %g1
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load i16, ptr %g1
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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(ptr %p, i32 %i) {
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; CHECK-LABEL: Function: test2:
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%pi.next = getelementptr [2 x i32], ptr %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], ptr %p, i32 1
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%g = getelementptr [2 x i32], ptr %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], ptr %p, i32 1
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%g2 = getelementptr [2 x i32], ptr %pi.next, i32 1
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br label %bb3
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bb3:
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%ptr_phi = phi ptr [ %f, %bb1 ], [ %f2, %bb2 ]
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%ptr_phi2 = phi ptr [ %g, %bb1 ], [ %g2, %bb2 ]
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; CHECK: NoAlias: i32* %f1, i32* %g1
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%f1 = getelementptr [2 x i32], ptr %ptr_phi , i32 1, i32 %i
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%g1 = getelementptr [2 x i32], ptr %ptr_phi2 , i32 1, i32 %i
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load i32, ptr %f1
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load i32, ptr %g1
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ret i32 0
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}
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