| ; RUN: opt -S -gvn-hoist < %s | FileCheck %s |
| |
| ; Check that the stores are not hoisted: it is invalid to hoist stores if they |
| ; are not executed on all paths. In this testcase, there are paths in the loop |
| ; that do not execute the stores. |
| |
| ; CHECK-LABEL: define i32 @main |
| ; CHECK: store |
| ; CHECK: store |
| ; CHECK: store |
| |
| @a = global i32 0, align 4 |
| |
| define i32 @main() { |
| entry: |
| br label %for.cond |
| |
| for.cond: ; preds = %for.inc5, %entry |
| %0 = load i32, i32* @a, align 4 |
| %cmp = icmp slt i32 %0, 1 |
| br i1 %cmp, label %for.cond1, label %for.end7 |
| |
| for.cond1: ; preds = %for.cond, %for.inc |
| %1 = load i32, i32* @a, align 4 |
| %cmp2 = icmp slt i32 %1, 1 |
| br i1 %cmp2, label %for.body3, label %for.inc5 |
| |
| for.body3: ; preds = %for.cond1 |
| %tobool = icmp ne i32 %1, 0 |
| br i1 %tobool, label %if.then, label %for.inc |
| |
| if.then: ; preds = %for.body3 |
| %inc = add nsw i32 %1, 1 |
| store i32 %inc, i32* @a, align 4 |
| br label %for.inc |
| |
| for.inc: ; preds = %for.body3, %if.then |
| %2 = load i32, i32* @a, align 4 |
| %inc4 = add nsw i32 %2, 1 |
| store i32 %inc4, i32* @a, align 4 |
| br label %for.cond1 |
| |
| for.inc5: ; preds = %for.cond1 |
| %inc6 = add nsw i32 %1, 1 |
| store i32 %inc6, i32* @a, align 4 |
| br label %for.cond |
| |
| for.end7: ; preds = %for.cond |
| ret i32 %0 |
| } |
| |
