| ; ModuleID = 'PR1657.bc' |
| ; Do not promote getelementptr because it may exposes load from a null pointer |
| ; and store from a null pointer which are covered by |
| ; icmp eq %struct.decision* null, null condition. |
| ; RUN: opt < %s -licm -S | not grep promoted |
| %struct.decision = type { i8, %struct.decision* } |
| |
| define i32 @main() { |
| entry: |
| br label %blah.i |
| |
| blah.i: ; preds = %cond_true.i, %entry |
| %tmp3.i = icmp eq %struct.decision* null, null ; <i1> [#uses=1] |
| br i1 %tmp3.i, label %clear_modes.exit, label %cond_true.i |
| |
| cond_true.i: ; preds = %blah.i |
| %tmp1.i = getelementptr %struct.decision, %struct.decision* null, i32 0, i32 0 ; <i8*> [#uses=1] |
| store i8 0, i8* %tmp1.i |
| br label %blah.i |
| |
| clear_modes.exit: ; preds = %blah.i |
| call void @exit( i32 0 ) |
| unreachable |
| } |
| |
| define i32 @f(i8* %ptr) { |
| entry: |
| br label %loop.head |
| |
| loop.head: ; preds = %cond.true, %entry |
| %x = phi i8* [ %ptr, %entry ], [ %ptr.i, %cond.true ] ; <i8*> [#uses=1] |
| %tmp3.i = icmp ne i8* %ptr, %x ; <i1> [#uses=1] |
| br i1 %tmp3.i, label %cond.true, label %exit |
| |
| cond.true: ; preds = %loop.head |
| %ptr.i = getelementptr i8, i8* %ptr, i32 0 ; <i8*> [#uses=2] |
| store i8 0, i8* %ptr.i |
| br label %loop.head |
| |
| exit: ; preds = %loop.head |
| ret i32 0 |
| } |
| |
| define i32 @f2(i8* %p, i8* %q) { |
| entry: |
| br label %loop.head |
| |
| loop.head: ; preds = %cond.true, %entry |
| %tmp3.i = icmp eq i8* null, %q ; <i1> [#uses=1] |
| br i1 %tmp3.i, label %exit, label %cond.true |
| |
| cond.true: ; preds = %loop.head |
| %ptr.i = getelementptr i8, i8* %p, i32 0 ; <i8*> [#uses=2] |
| store i8 0, i8* %ptr.i |
| br label %loop.head |
| |
| exit: ; preds = %loop.head |
| ret i32 0 |
| } |
| |
| declare void @exit(i32) |