1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
|
; Here we have a case where there are two loops and LICM is hoisting an
; instruction from one loop into the other loop! This is obviously bad and
; happens because preheader insertion doesn't insert a preheader for this
; case... bad.
; RUN: opt %s -licm -loop-deletion -simplifycfg -S | \
; RUN: not grep {br }
define i32 @main(i32 %argc) {
; <label>:0
br label %bb5
bb5: ; preds = %bb5, %0
%I = phi i32 [ 0, %0 ], [ %I2, %bb5 ] ; <i32> [#uses=1]
%I2 = add i32 %I, 1 ; <i32> [#uses=2]
%c = icmp eq i32 %I2, 10 ; <i1> [#uses=1]
br i1 %c, label %bb5, label %bb8
bb8: ; preds = %bb8, %bb5
%cann-indvar = phi i32 [ 0, %bb8 ], [ 0, %bb5 ] ; <i32> [#uses=0]
%X = add i32 %argc, %argc ; <i32> [#uses=1]
br i1 false, label %bb8, label %bb10
bb10: ; preds = %bb8
ret i32 %X
}
|
