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
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
| ;; AArch64 is arbitralily chosen as a 32/64-bit RISC representative to show the transform in all tests.
; RUN: opt < %s -codegenprepare -S -mtriple=aarch64-unknown-unknown | FileCheck %s --check-prefix=ARM64
; AArch64 widens to 32-bit.
define i32 @widen_switch_i16(i32 %a) {
entry:
%trunc = trunc i32 %a to i16
switch i16 %trunc, label %sw.default [
i16 1, label %sw.bb0
i16 -1, label %sw.bb1
]
sw.bb0:
br label %return
sw.bb1:
br label %return
sw.default:
br label %return
return:
%retval = phi i32 [ -1, %sw.default ], [ 0, %sw.bb0 ], [ 1, %sw.bb1 ]
ret i32 %retval
; ARM64-LABEL: @widen_switch_i16(
; ARM64: %0 = zext i16 %trunc to i32
; ARM64-NEXT: switch i32 %0, label %sw.default [
; ARM64-NEXT: i32 1, label %sw.bb0
; ARM64-NEXT: i32 65535, label %sw.bb1
}
; Widen to 32-bit from a smaller, non-native type.
define i32 @widen_switch_i17(i32 %a) {
entry:
%trunc = trunc i32 %a to i17
switch i17 %trunc, label %sw.default [
i17 10, label %sw.bb0
i17 -1, label %sw.bb1
]
sw.bb0:
br label %return
sw.bb1:
br label %return
sw.default:
br label %return
return:
%retval = phi i32 [ -1, %sw.default ], [ 0, %sw.bb0 ], [ 1, %sw.bb1 ]
ret i32 %retval
; ARM64-LABEL: @widen_switch_i17(
; ARM64: %0 = zext i17 %trunc to i32
; ARM64-NEXT: switch i32 %0, label %sw.default [
; ARM64-NEXT: i32 10, label %sw.bb0
; ARM64-NEXT: i32 131071, label %sw.bb1
}
; If the switch condition is a sign-extended function argument, then the
; condition and cases should be sign-extended rather than zero-extended
; because the sign-extension can be optimized away.
define i32 @widen_switch_i16_sext(i2 signext %a) {
entry:
switch i2 %a, label %sw.default [
i2 1, label %sw.bb0
i2 -1, label %sw.bb1
]
sw.bb0:
br label %return
sw.bb1:
br label %return
sw.default:
br label %return
return:
%retval = phi i32 [ -1, %sw.default ], [ 0, %sw.bb0 ], [ 1, %sw.bb1 ]
ret i32 %retval
; ARM64-LABEL: @widen_switch_i16_sext(
; ARM64: %0 = sext i2 %a to i32
; ARM64-NEXT: switch i32 %0, label %sw.default [
; ARM64-NEXT: i32 1, label %sw.bb0
; ARM64-NEXT: i32 -1, label %sw.bb1
}
|