File: dead-phi.ll

package info (click to toggle)
llvm-toolchain-17 1%3A17.0.6-22
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid, trixie
  • size: 1,799,624 kB
  • sloc: cpp: 6,428,607; ansic: 1,383,196; asm: 793,408; python: 223,504; objc: 75,364; f90: 60,502; lisp: 33,869; pascal: 15,282; sh: 9,684; perl: 7,453; ml: 4,937; awk: 3,523; makefile: 2,889; javascript: 2,149; xml: 888; fortran: 619; cs: 573
file content (21 lines) | stat: -rw-r--r-- 443 bytes parent folder | download | duplicates (44) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
 
; RUN: opt < %s -loop-reduce -S | grep phi | count 1

define void @foo(i32 %n) {
entry:
  br label %loop

loop:
  %i = phi i32 [ 0, %entry ], [ %i.next, %loop ]

  ; These three instructions form an isolated cycle and can be deleted.
  %j = phi i32 [ 0, %entry ], [ %j.y, %loop ]
  %j.x = add i32 %j, 1
  %j.y = mul i32 %j.x, 2

  %i.next = add i32 %i, 1
  %c = icmp ne i32 %i.next, %n
  br i1 %c, label %loop, label %exit

exit:
  ret void
}