File: tail-merge-unreachable.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 (34 lines) | stat: -rw-r--r-- 777 bytes parent folder | download | duplicates (23) 
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
 
; RUN: llc -mtriple=x86_64-linux-gnu %s -o - -verify-machineinstrs | FileCheck %s

define i32 @tail_merge_unreachable(i32 %i) {
entry:
  br i1 undef, label %sw, label %end
sw:
  switch i32 %i, label %end [
    i32 99,  label %sw.bb
    i32 98,  label %sw.bb
    i32 101, label %sw.bb
    i32 97,  label %sw.bb2
    i32 96,  label %sw.bb2
    i32 100, label %sw.bb2
  ]
sw.bb:
  unreachable
sw.bb2:
  unreachable
end:
  %p = phi i32 [ 1, %sw ], [ 0, %entry ]
  ret i32 %p

; CHECK-LABEL: tail_merge_unreachable:
; Range Check
; CHECK: addl $-96
; CHECK: cmpl $5
; CHECK: jbe [[JUMP_TABLE_BLOCK:[.][A-Za-z0-9_]+]]
; CHECK: retq
; CHECK: [[JUMP_TABLE_BLOCK]]:
; CHECK: btl
; CHECK: jae [[UNREACHABLE_BLOCK:[.][A-Za-z0-9_]+]]
; CHECK: [[UNREACHABLE_BLOCK]]:
; CHECK: .Lfunc_end0
}