File: 2014-06-11-SwitchDefaultUnreachableOpt.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 (44 lines) | stat: -rw-r--r-- 670 bytes parent folder | download | duplicates (22) 
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
37
38
39
40
41
42
43
44
 
; RUN: opt < %s -lowerswitch -S | FileCheck %s
;
; The switch is lowered with a single icmp.
; CHECK: icmp
; CHECK-NOT: icmp
;
;int foo(int a) {
;
;  switch (a) {
;  case 0:
;    return 10;
;  case 1:
;    return 3;
;  default:
;    __builtin_unreachable();
;  }
;
;}

define i32 @foo(i32 %a) {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  store i32 %a, i32* %2, align 4
  %3 = load i32, i32* %2, align 4
  switch i32 %3, label %6 [
    i32 0, label %4
    i32 1, label %5
  ]

; <label>:4 
  store i32 10, i32* %1
  br label %7

; <label>:5
  store i32 3, i32* %1
  br label %7

; <label>:6
  unreachable

; <label>:7
  %8 = load i32, i32* %1
  ret i32 %8
}