File: pr30454.ll

package info (click to toggle)
llvm-toolchain-11 1%3A11.0.1-2
  • links: PTS, VCS
  • area: main
  • in suites: bullseye
  • size: 995,808 kB
  • sloc: cpp: 4,767,656; ansic: 760,916; asm: 477,436; python: 170,940; objc: 69,804; lisp: 29,914; sh: 23,855; f90: 18,173; pascal: 7,551; perl: 7,471; ml: 5,603; awk: 3,489; makefile: 2,573; xml: 915; cs: 573; fortran: 503; javascript: 452
file content (32 lines) | stat: -rw-r--r-- 729 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
20
21
22
23
24
25
26
27
28
29
30
31
32
 
; RUN: opt < %s -lcssa -licm -S | FileCheck %s
; PR30454
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

declare i8 @bar()

; Test that we preserve LCSSA form when removing edges from unreachable blocks.
; CHECK-LABEL: @foo
define void @foo() {
entry:
  br label %for.cond

for.cond:
  %x = phi i8 [ undef, %entry ], [ %y, %for.latch ]
  br i1 undef, label %for.latch, label %exit

; CHECK:      unreachable.bb:
; CHECK-NEXT:   unreachable
unreachable.bb:
  br i1 undef, label %exit, label %for.latch

for.latch:
  %y = call i8 @bar()
  br label %for.cond

; CHECK:      exit:
; CHECK-NEXT:   %x.lcssa = phi i8 [ %x, %for.cond ]
exit:
  %z = zext i8 %x to i32
  ret void
}