File: 2003-12-10-ExitBlocksProblem.ll

package info (click to toggle)
llvm-toolchain-14 1%3A14.0.6-12
  • links: PTS, VCS
  • area: main
  • in suites: bookworm
  • size: 1,496,180 kB
  • sloc: cpp: 5,593,972; ansic: 986,872; asm: 585,869; python: 184,223; objc: 72,530; lisp: 31,119; f90: 27,793; javascript: 9,780; pascal: 9,762; sh: 9,482; perl: 7,468; ml: 5,432; awk: 3,523; makefile: 2,538; xml: 953; cs: 573; fortran: 567
file content (36 lines) | stat: -rw-r--r-- 1,177 bytes parent folder | download | duplicates (22)
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
34
35
36
; LoopSimplify is breaking LICM on this testcase because the exit blocks from
; the loop are reachable from more than just the exit nodes: the exit blocks
; have predecessors from outside of the loop!
;
; This is distilled from a monsterous crafty example.

; RUN: opt < %s -licm -disable-output


@G = weak global i32 0		; <i32*> [#uses=7]

define i32 @main() {
entry:
	store i32 123, i32* @G
	br label %loopentry.i
loopentry.i:		; preds = %endif.1.i, %entry
	%tmp.0.i = load i32, i32* @G		; <i32> [#uses=1]
	%tmp.1.i = icmp eq i32 %tmp.0.i, 123		; <i1> [#uses=1]
	br i1 %tmp.1.i, label %Out.i, label %endif.0.i
endif.0.i:		; preds = %loopentry.i
	%tmp.3.i = load i32, i32* @G		; <i32> [#uses=1]
	%tmp.4.i = icmp eq i32 %tmp.3.i, 126		; <i1> [#uses=1]
	br i1 %tmp.4.i, label %ExitBlock.i, label %endif.1.i
endif.1.i:		; preds = %endif.0.i
	%tmp.6.i = load i32, i32* @G		; <i32> [#uses=1]
	%inc.i = add i32 %tmp.6.i, 1		; <i32> [#uses=1]
	store i32 %inc.i, i32* @G
	br label %loopentry.i
Out.i:		; preds = %loopentry.i
	store i32 0, i32* @G
	br label %ExitBlock.i
ExitBlock.i:		; preds = %Out.i, %endif.0.i
	%tmp.7.i = load i32, i32* @G		; <i32> [#uses=1]
	ret i32 %tmp.7.i
}