2013-03-13 00:27:52 +08:00
|
|
|
; REQUIRES: asserts
|
2012-07-03 02:37:59 +08:00
|
|
|
; RUN: opt < %s -loop-unswitch -stats -disable-output 2>&1 | grep "1 loop-unswitch - Number of branches unswitched" | count 1
|
2008-12-09 07:44:46 +08:00
|
|
|
; PR 3170
|
|
|
|
|
define i32 @a(i32 %x, i32 %y) nounwind {
|
2008-11-04 03:38:07 +08:00
|
|
|
entry:
|
2008-12-09 07:44:46 +08:00
|
|
|
%0 = icmp ult i32 0, %y ; <i1> [#uses=1]
|
|
|
|
|
br i1 %0, label %bb.nph, label %bb4
|
|
|
|
|
|
|
|
|
|
bb.nph: ; preds = %entry
|
|
|
|
|
%1 = icmp eq i32 %x, 0 ; <i1> [#uses=1]
|
|
|
|
|
br label %bb
|
2008-11-04 03:38:07 +08:00
|
|
|
|
2008-12-09 07:44:46 +08:00
|
|
|
bb: ; preds = %bb.nph, %bb3
|
|
|
|
|
%i.01 = phi i32 [ %3, %bb3 ], [ 0, %bb.nph ] ; <i32> [#uses=1]
|
2008-11-04 03:38:07 +08:00
|
|
|
br i1 %1, label %bb2, label %bb1
|
|
|
|
|
|
|
|
|
|
bb1: ; preds = %bb
|
2008-12-09 07:44:46 +08:00
|
|
|
%2 = tail call i32 (...)* @b() nounwind ; <i32> [#uses=0]
|
2008-11-04 03:38:07 +08:00
|
|
|
br label %bb2
|
|
|
|
|
|
2008-12-09 07:44:46 +08:00
|
|
|
bb2: ; preds = %bb, %bb1
|
|
|
|
|
%3 = add i32 %i.01, 1 ; <i32> [#uses=2]
|
|
|
|
|
br label %bb3
|
2008-11-04 03:38:07 +08:00
|
|
|
|
2008-12-09 07:44:46 +08:00
|
|
|
bb3: ; preds = %bb2
|
|
|
|
|
%i.0 = phi i32 [ %3, %bb2 ] ; <i32> [#uses=1]
|
|
|
|
|
%4 = icmp ult i32 %i.0, %y ; <i1> [#uses=1]
|
|
|
|
|
br i1 %4, label %bb, label %bb3.bb4_crit_edge
|
2008-11-04 03:38:07 +08:00
|
|
|
|
2008-12-09 07:44:46 +08:00
|
|
|
bb3.bb4_crit_edge: ; preds = %bb3
|
|
|
|
|
br label %bb4
|
|
|
|
|
|
|
|
|
|
bb4: ; preds = %bb3.bb4_crit_edge, %entry
|
|
|
|
|
ret i32 0
|
2008-11-04 03:38:07 +08:00
|
|
|
}
|
|
|
|
|
|
2008-12-09 07:44:46 +08:00
|
|
|
declare i32 @b(...)
|
