File: 2014-06-11-SwitchDefaultUnreachableOpt.ll

package info (click to toggle)
llvm-toolchain-16 1%3A16.0.6-15~deb12u1
  • links: PTS, VCS
  • area: main
  • in suites: bookworm
  • size: 1,634,792 kB
  • sloc: cpp: 6,179,261; ansic: 1,216,205; asm: 741,319; python: 196,614; objc: 75,325; f90: 49,640; lisp: 32,396; pascal: 12,286; sh: 9,394; perl: 7,442; ml: 5,494; awk: 3,523; makefile: 2,723; javascript: 1,206; xml: 886; fortran: 581; cs: 573
file content (44 lines) | stat: -rw-r--r-- 672 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
35
36
37
38
39
40
41
42
43
44
 
; RUN: opt < %s -passes=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, ptr %2, align 4
  %3 = load i32, ptr %2, align 4
  switch i32 %3, label %6 [
    i32 0, label %4
    i32 1, label %5
  ]

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

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

; <label>:6
  unreachable

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