File: 2003-10-05-DeadPHIInsertion.ll

package info (click to toggle)
swiftlang 6.0.3-2
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid, trixie
  • size: 2,519,992 kB
  • sloc: cpp: 9,107,863; ansic: 2,040,022; asm: 1,135,751; python: 296,500; objc: 82,456; f90: 60,502; lisp: 34,951; pascal: 19,946; sh: 18,133; perl: 7,482; ml: 4,937; javascript: 4,117; makefile: 3,840; awk: 3,535; xml: 914; fortran: 619; cs: 573; ruby: 573
file content (22 lines) | stat: -rw-r--r-- 615 bytes parent folder | download | duplicates (14) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
 
; Mem2reg should not insert dead PHI nodes!  The naive algorithm inserts a PHI
;  node in L3, even though there is no load of %A in anything dominated by L3.

; RUN: opt < %s -passes=mem2reg -S | not grep phi

define void @test(i32 %B, i1 %C) {
	%A = alloca i32		; <ptr> [#uses=4]
	store i32 %B, ptr %A
	br i1 %C, label %L1, label %L2
L1:		; preds = %0
	store i32 %B, ptr %A
	%D = load i32, ptr %A		; <i32> [#uses=1]
	call void @test( i32 %D, i1 false )
	br label %L3
L2:		; preds = %0
	%E = load i32, ptr %A		; <i32> [#uses=1]
	call void @test( i32 %E, i1 true )
	br label %L3
L3:		; preds = %L2, %L1
	ret void
}