blob: 2dac678a498458cfa3ad53e374aebad3c99dd7ab (
plain)
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
|
# RUN: llc -mtriple=x86_64 -run-pass=implicit-null-checks %s -o - | FileCheck %s
--- |
define i32 @reg-rewrite(ptr %x, i1 %arg) {
entry:
br i1 %arg, label %is_null, label %not_null, !make.implicit !0
is_null:
ret i32 42
not_null:
ret i32 100
}
!0 = !{}
...
---
# Check that the TEST instruction is replaced with
# FAULTING_OP only if there are no instructions
# between the TEST and conditional jump
# that clobber the register used in TEST.
name: reg-rewrite
alignment: 16
tracksRegLiveness: true
liveins:
- { reg: '$rdi' }
body: |
bb.0.entry:
liveins: $rdi
TEST64rr $rdi, $rdi, implicit-def $eflags
; CHECK-LABEL: bb.0.entry
; CHECK-NOT: FAULTING_OP
renamable $rdi = MOV64ri 5000
JCC_1 %bb.2, 4, implicit $eflags
bb.1.not_null:
liveins: $rdi, $rsi
$rax = MOV64rm renamable $rdi, 1, $noreg, 4, $noreg
RET64 $eax
bb.2.is_null:
$eax = MOV32ri 200
RET64 $eax
...
|
