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2b475922e6
Analyse Phis under the starting assumption that they are NoAlias. Recursively look at their inputs. If they MayAlias/MustAlias there must be an input that makes them so. Addresses bug 14351. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169788 91177308-0d34-0410-b5e6-96231b3b80d8
95 lines
3.4 KiB
LLVM
95 lines
3.4 KiB
LLVM
target datalayout =
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"e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
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; RUN: opt < %s -basicaa -aa-eval -print-all-alias-modref-info -disable-output 2>&1 | FileCheck %s
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; ptr_phi and ptr2_phi do not alias.
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; CHECK: test_noalias_1
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; CHECK: NoAlias: i32* %ptr2_phi, i32* %ptr_phi
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define i32 @test_noalias_1(i32* %ptr2, i32 %count, i32* %coeff) {
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entry:
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%ptr = getelementptr inbounds i32* %ptr2, i64 1
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br label %while.body
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while.body:
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%num = phi i32 [ %count, %entry ], [ %dec, %while.body ]
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%ptr_phi = phi i32* [ %ptr, %entry ], [ %ptr_inc, %while.body ]
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%ptr2_phi = phi i32* [ %ptr2, %entry ], [ %ptr2_inc, %while.body ]
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%result.09 = phi i32 [ 0 , %entry ], [ %add, %while.body ]
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%dec = add nsw i32 %num, -1
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%0 = load i32* %ptr_phi, align 4
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store i32 %0, i32* %ptr2_phi, align 4
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%1 = load i32* %coeff, align 4
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%2 = load i32* %ptr_phi, align 4
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%mul = mul nsw i32 %1, %2
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%add = add nsw i32 %mul, %result.09
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%tobool = icmp eq i32 %dec, 0
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%ptr_inc = getelementptr inbounds i32* %ptr_phi, i64 1
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%ptr2_inc = getelementptr inbounds i32* %ptr2_phi, i64 1
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br i1 %tobool, label %the_exit, label %while.body
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the_exit:
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ret i32 %add
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}
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; CHECK: test_noalias_2
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; CHECK: NoAlias: i32* %ptr_outer_phi, i32* %ptr_outer_phi2
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; CHECK: NoAlias: i32* %ptr2_phi, i32* %ptr_phi
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define i32 @test_noalias_2(i32* %ptr2, i32 %count, i32* %coeff) {
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entry:
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%ptr = getelementptr inbounds i32* %ptr2, i64 1
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br label %outer.while.header
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outer.while.header:
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%ptr_outer_phi = phi i32* [%ptr_inc_outer, %outer.while.backedge], [ %ptr, %entry]
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%ptr_outer_phi2 = phi i32* [%ptr2_inc_outer, %outer.while.backedge], [ %ptr2, %entry]
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%num.outer = phi i32 [ %count, %entry ], [ %dec.outer, %outer.while.backedge ]
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br label %while.body
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while.body:
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%num = phi i32 [ %count, %outer.while.header ], [ %dec, %while.body ]
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%ptr_phi = phi i32* [ %ptr_outer_phi, %outer.while.header ], [ %ptr_inc, %while.body ]
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%ptr2_phi = phi i32* [ %ptr_outer_phi2, %outer.while.header ], [ %ptr2_inc, %while.body ]
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%result.09 = phi i32 [ 0 , %outer.while.header ], [ %add, %while.body ]
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%dec = add nsw i32 %num, -1
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%0 = load i32* %ptr_phi, align 4
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store i32 %0, i32* %ptr2_phi, align 4
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%1 = load i32* %coeff, align 4
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%2 = load i32* %ptr_phi, align 4
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%mul = mul nsw i32 %1, %2
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%add = add nsw i32 %mul, %result.09
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%tobool = icmp eq i32 %dec, 0
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%ptr_inc = getelementptr inbounds i32* %ptr_phi, i64 1
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%ptr2_inc = getelementptr inbounds i32* %ptr2_phi, i64 1
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br i1 %tobool, label %outer.while.backedge, label %while.body
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outer.while.backedge:
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%ptr_inc_outer = getelementptr inbounds i32* %ptr_phi, i64 1
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%ptr2_inc_outer = getelementptr inbounds i32* %ptr2_phi, i64 1
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%dec.outer = add nsw i32 %num.outer, -1
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%br.cond = icmp eq i32 %dec.outer, 0
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br i1 %br.cond, label %the_exit, label %outer.while.header
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the_exit:
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ret i32 %add
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}
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; CHECK: test_noalias_3
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; CHECK: MayAlias: i8* %ptr2_phi, i8* %ptr_phi
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define i32 @test_noalias_3(i8* noalias %x, i8* noalias %y, i8* noalias %z,
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i32 %count) {
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entry:
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br label %while.body
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while.body:
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%num = phi i32 [ %count, %entry ], [ %dec, %while.body ]
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%ptr_phi = phi i8* [ %x, %entry ], [ %z, %while.body ]
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%ptr2_phi = phi i8* [ %y, %entry ], [ %ptr_phi, %while.body ]
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%dec = add nsw i32 %num, -1
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%tobool = icmp eq i32 %dec, 0
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br i1 %tobool, label %the_exit, label %while.body
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the_exit:
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ret i32 1
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}
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