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|
# RUN: llc -o - -mtriple=thumbv7--windows-gnu -run-pass=greedy -run-pass=virtregrewriter %s | FileCheck %s
--- |
target datalayout = "e-m:w-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
target triple = "thumbv7--windows-gnu"
define void @subregLiveThrough() { ret void }
define void @subregNotLiveThrough() { ret void }
define void @subregNotLiveThrough2() { ret void }
...
---
# Check that we properly recognize that r1 is live through
# the first subreg copy.
# That will materialize as an implicit use of the big register
# on that copy.
# PR34107.
#
# CHECK-LABEL: name: subregLiveThrough
name: subregLiveThrough
tracksRegLiveness: true
registers:
- { id: 0, class: gprpair }
body: |
bb.0:
liveins: %r0, %r1
; That copy is being coalesced so we should use a KILL
; placeholder. If that's not a kill that means we probably
; not coalescing %0 and %r0_r1 and thus we are not testing
; the problematic code anymore.
;
; CHECK: %r0 = KILL %r0, implicit killed %r0_r1, implicit-def %r0_r1
; CHECK-NEXT: %r1 = KILL %r1, implicit killed %r0_r1
undef %0.gsub_0 = COPY %r0
%0.gsub_1 = COPY %r1
tBX_RET 14, %noreg, implicit %0
...
---
# Check that we properly recognize that r1 is *not* live through
# the first subreg copy.
# CHECK-LABEL: name: subregNotLiveThrough
name: subregNotLiveThrough
tracksRegLiveness: true
registers:
- { id: 0, class: gprpair }
body: |
bb.0:
liveins: %r0, %r1
; r1 is not live through so check we are not implicitly using
; the big register.
; CHECK: %r0 = KILL %r0, implicit-def %r0_r1
; CHECK-NEXT: tBX_RET
undef %0.gsub_0 = COPY %r0
tBX_RET 14, %noreg, implicit %0
...
---
# Check that we properly recognize that r1 is *not* live through
# the first subreg copy. It is defined by this copy, but is not
# through.
# CHECK-LABEL: name: subregNotLiveThrough2
name: subregNotLiveThrough2
tracksRegLiveness: true
registers:
- { id: 0, class: gprpair }
body: |
bb.0:
liveins: %r0, %r1
; r1 is not live through so check we are not implicitly using
; the big register.
; CHECK: %r0 = KILL %r0, implicit-def %r1, implicit-def %r0_r1
; CHECK-NEXT: tBX_RET
undef %0.gsub_0 = COPY %r0, implicit-def %r1
tBX_RET 14, %noreg, implicit %0
...
|
