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|
# RUN: llc -mtriple=x86_64 -run-pass=implicit-null-checks %s -o - | FileCheck %s
--- |
define i32 @reg-rewrite(i32* %x) {
entry:
br i1 undef, 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: 4
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
JE_1 %bb.2, implicit $eflags
bb.1.not_null:
liveins: $rdi, $rsi
$rax = MOV64rm renamable $rdi, 1, $noreg, 4, $noreg
RETQ $eax
bb.2.is_null:
$eax = MOV32ri 200
RETQ $eax
...
|
