File: 2002-05-20-MissedIncomingValue.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 (19 lines) | stat: -rw-r--r-- 474 bytes parent folder | download | duplicates (16) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
 
; This test shows a case where SCCP is incorrectly eliminating the PHI node
; because it thinks it has a constant 0 value, when it really doesn't.

; RUN: opt < %s -passes=sccp -S | grep phi

define i32 @test(i32 %A, i1 %c) {
bb1:
	br label %BB2
BB2:		; preds = %BB4, %bb1
	%V = phi i32 [ 0, %bb1 ], [ %A, %BB4 ]		; <i32> [#uses=1]
	br label %BB3
BB3:		; preds = %BB2
	br i1 %c, label %BB4, label %BB5
BB4:		; preds = %BB3
	br label %BB2
BB5:		; preds = %BB3
	ret i32 %V
}