File: tail-merge-unreachable.ll

package info (click to toggle)
llvm-toolchain-21 1%3A21.1.6-3
  • links: PTS, VCS
  • area: main
  • in suites: sid
  • size: 2,245,028 kB
  • sloc: cpp: 7,619,726; ansic: 1,434,018; asm: 1,058,748; python: 252,740; f90: 94,671; objc: 70,685; lisp: 42,813; pascal: 18,401; sh: 8,601; ml: 5,111; perl: 4,720; makefile: 3,675; awk: 3,523; javascript: 2,409; xml: 892; fortran: 770
file content (34 lines) | stat: -rw-r--r-- 785 bytes parent folder | download | duplicates (5) 
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, i1 %arg) {
entry:
  br i1 %arg, 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
}