1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
|
; This test shows SCCP "proving" that the loop (from bb6 to 14) loops infinitely
; this is in fact NOT the case, so the return should still be alive in the code
; after sccp and CFG simplification have been performed.
;
; RUN: opt < %s -passes=sccp,simplifycfg -simplifycfg-require-and-preserve-domtree=1 -S | \
; RUN: grep ret
define void @old_main() {
bb3:
br label %bb6
bb6: ; preds = %bb14, %bb3
%reg403 = phi i32 [ %reg155, %bb14 ], [ 0, %bb3 ] ; <i32> [#uses=1]
%reg155 = add i32 %reg403, 1 ; <i32> [#uses=2]
br label %bb11
bb11: ; preds = %bb11, %bb6
%reg407 = phi i32 [ %reg408, %bb11 ], [ 0, %bb6 ] ; <i32> [#uses=2]
%reg408 = add i32 %reg407, 1 ; <i32> [#uses=1]
%cond550 = icmp sle i32 %reg407, 1 ; <i1> [#uses=1]
br i1 %cond550, label %bb11, label %bb12
bb12: ; preds = %bb11
br label %bb13
bb13: ; preds = %bb13, %bb12
%reg409 = phi i32 [ %reg410, %bb13 ], [ 0, %bb12 ] ; <i32> [#uses=1]
%reg410 = add i32 %reg409, 1 ; <i32> [#uses=2]
%cond552 = icmp sle i32 %reg410, 2 ; <i1> [#uses=1]
br i1 %cond552, label %bb13, label %bb14
bb14: ; preds = %bb13
%cond553 = icmp sle i32 %reg155, 31 ; <i1> [#uses=1]
br i1 %cond553, label %bb6, label %bb15
bb15: ; preds = %bb14
ret void
}
|
