pr29031.ll
1.49 KB
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; 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
}