| ; 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 { |
| entry: |
| %"alloca point" = bitcast i32 0 to i32 |
| %tmp = icmp ne i32 %cond, 0 |
| br i1 %tmp, label %bb, label %bb1 |
| |
| bb: |
| br label %bb2 |
| |
| bb1: |
| br label %bb2 |
| |
| bb2: |
| %P = phi i32* [ @X, %bb ], [ @Y, %bb1 ] |
| %tmp1 = load i32, i32* @Z, align 4 |
| store i32 123, i32* %P, align 4 |
| %tmp2 = load i32, i32* @Z, align 4 |
| br label %return |
| |
| 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, i32* %jj7, align 4 |
| %idxprom4 = zext i32 %1 to i64 |
| %arrayidx5 = getelementptr inbounds [100 x i32], [100 x i32]* %oa5, i64 0, i64 %idxprom4 |
| %2 = load i32, 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, 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], [100 x i32]* %oa5, i64 0, i64 %idxprom12 |
| call void @inc(i32* %jj7) |
| br label %codeRepl |
| |
| bye: |
| %.reload = load i32, i32* %jj7, align 4 |
| ret i32 %.reload |
| } |
| |
| declare i1 @cond(i32*) |
| |
| declare void @inc(i32*) |
| |
| |