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Diffstat (limited to 'test/Analysis/BasicAA/phi-aa.ll')
| -rw-r--r-- | test/Analysis/BasicAA/phi-aa.ll | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/test/Analysis/BasicAA/phi-aa.ll b/test/Analysis/BasicAA/phi-aa.ll index 6aa26c1..74279e1 100644 --- a/test/Analysis/BasicAA/phi-aa.ll +++ b/test/Analysis/BasicAA/phi-aa.ll @@ -1,10 +1,14 @@ ; RUN: opt < %s -basicaa -aa-eval -print-all-alias-modref-info -disable-output 2>&1 | FileCheck %s +target datalayout = "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" +target triple = "x86_64-unknown-linux-gnu" + ; rdar://7282591 @X = common global i32 0 @Y = common global i32 0 @Z = common global i32 0 +; CHECK-LABEL: foo ; CHECK: NoAlias: i32* %P, i32* @Z define void @foo(i32 %cond) nounwind { @@ -29,3 +33,46 @@ bb2: return: ret void } + +; Pointers can vary in between iterations of loops. +; PR18068 + +; CHECK-LABEL: pr18068 +; CHECK: MayAlias: i32* %0, i32* %arrayidx5 + +define i32 @pr18068(i32* %jj7, i32* %j) { +entry: + %oa5 = alloca [100 x i32], align 16 + br label %codeRepl + +codeRepl: + %0 = phi i32* [ %arrayidx13, %for.body ], [ %j, %entry ] + %targetBlock = call i1 @cond(i32* %jj7) + br i1 %targetBlock, label %for.body, label %bye + +for.body: + %1 = load i32* %jj7, align 4 + %idxprom4 = zext i32 %1 to i64 + %arrayidx5 = getelementptr inbounds [100 x i32]* %oa5, i64 0, i64 %idxprom4 + %2 = load i32* %arrayidx5, align 4 + %sub6 = sub i32 %2, 6 + store i32 %sub6, i32* %arrayidx5, align 4 + ; %0 and %arrayidx5 can alias! It is not safe to DSE the above store. + %3 = load i32* %0, align 4 + store i32 %3, i32* %arrayidx5, align 4 + %sub11 = add i32 %1, -1 + %idxprom12 = zext i32 %sub11 to i64 + %arrayidx13 = getelementptr inbounds [100 x i32]* %oa5, i64 0, i64 %idxprom12 + call void @inc(i32* %jj7) + br label %codeRepl + +bye: + %.reload = load i32* %jj7, align 4 + ret i32 %.reload +} + +declare i1 @cond(i32*) + +declare void @inc(i32*) + + |