File: condition-phi-unreachable-default.ll

package info (click to toggle)
llvm-toolchain-13 1%3A13.0.1-6~deb11u1
  • links: PTS, VCS
  • area: main
  • in suites: bullseye
  • size: 1,418,812 kB
  • sloc: cpp: 5,290,827; ansic: 996,570; asm: 544,593; python: 188,212; objc: 72,027; lisp: 30,291; f90: 25,395; sh: 24,900; javascript: 9,780; pascal: 9,398; perl: 7,484; ml: 5,432; awk: 3,523; makefile: 2,892; xml: 953; cs: 573; fortran: 539
file content (36 lines) | stat: -rw-r--r-- 1,075 bytes parent folder | download | duplicates (11) 
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
 
; RUN: opt < %s -lowerswitch -S | FileCheck %s

; This test verifies -lowerswitch does not crash when an removing an
; unreachable default branch causes a PHI node used as the switch
; condition to be erased.

define void @f() local_unnamed_addr {
entry:
  br label %sw.epilog

sw.epilog:                                        ; preds = %sw.epilog.outer, %for.body
  %i = phi i32 [ undef, %for.body ], [ 0, %entry ]
  br i1 undef, label %for.body, label %for.end

for.body:                                         ; preds = %sw.epilog
  switch i32 %i, label %sw.epilog [
    i32 0, label %sw.epilog.outer.backedge.loopexit
    i32 1, label %sw.epilog.outer.backedge
  ]

sw.epilog.outer.backedge.loopexit:                ; preds = %for.body
  br label %for.end

sw.epilog.outer.backedge:                         ; preds = %for.body
  unreachable

for.end:                                          ; preds = %sw.epilog
  ret void
}

; The phi and the switch should both be eliminated.
; CHECK: @f()
; CHECK: sw.epilog:
; CHECK-NOT: phi
; CHECK: for.body:
; CHECK-NOT: switch