forked from OSchip/llvm-project
55 lines
1.5 KiB
LLVM
55 lines
1.5 KiB
LLVM
; RUN: opt -S -structurizecfg %s | FileCheck %s
|
|
|
|
; r321751 introduced a bug where control flow branching from if to exit was
|
|
; not handled properly and instead ended up in an infinite loop.
|
|
define void @bug36015(i32 %cmp0, i32 %count) {
|
|
entry:
|
|
br label %loop.outer
|
|
|
|
loop.outer:
|
|
%ctr.loop.outer = phi i32 [ 0, %entry ], [ %ctr.else, %else ]
|
|
call void @foo(i32 0)
|
|
br label %loop.inner
|
|
|
|
loop.inner:
|
|
%ctr.loop.inner = phi i32 [ %ctr.loop.outer, %loop.outer ], [ %ctr.if, %if ]
|
|
call void @foo(i32 1)
|
|
%cond.inner = icmp eq i32 %cmp0, %ctr.loop.inner
|
|
br i1 %cond.inner, label %if, label %else
|
|
|
|
; CHECK: if:
|
|
; CHECK: %cond.if = icmp sge i32 %ctr.if, %count
|
|
; CHECK: br label %Flow
|
|
if:
|
|
%ctr.if = add i32 %ctr.loop.inner, 1
|
|
call void @foo(i32 2)
|
|
%cond.if = icmp slt i32 %ctr.if, %count
|
|
br i1 %cond.if, label %loop.inner, label %exit
|
|
|
|
; CHECK: Flow:
|
|
; CHECK: %1 = phi i1 [ %cond.if, %if ], [ true, %loop.inner ]
|
|
; CHECK: %2 = phi i1 [ false, %if ], [ true, %loop.inner ]
|
|
; CHECK: br i1 %1, label %Flow1, label %loop.inner
|
|
|
|
; CHECK: Flow1:
|
|
; CHECK: br i1 %2, label %else, label %Flow2
|
|
|
|
; CHECK: else:
|
|
; CHECK: %cond.else = icmp sge i32 %ctr.else, %count
|
|
; CHECK: br label %Flow2
|
|
else:
|
|
%ctr.else = add i32 %ctr.loop.inner, 1
|
|
call void @foo(i32 3)
|
|
%cond.else = icmp slt i32 %ctr.else, %count
|
|
br i1 %cond.else, label %loop.outer, label %exit
|
|
|
|
; CHECK: Flow2:
|
|
; CHECK: %4 = phi i1 [ %cond.else, %else ], [ true, %Flow1 ]
|
|
; CHECK: br i1 %4, label %exit, label %loop.outer
|
|
|
|
exit:
|
|
ret void
|
|
}
|
|
|
|
declare void @foo(i32)
|