25 lines
838 B
LLVM
25 lines
838 B
LLVM
|
; 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 -simplifycfg-require-and-preserve-domtree=1 -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
|
||
|
|
}
|
||
|
|
|