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|
# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
# RUN: llc -mtriple aarch64 -run-pass=aarch64-post-select-optimize -verify-machineinstrs %s -o - | FileCheck %s
--- |
target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
@x = external hidden local_unnamed_addr global i32*, align 8
define void @copy_from_larger_rc_def() { ret void }
define void @copy_from_larger_rc_def_multi_use() { ret void }
define void @copy_from_smaller_rc_def() { ret void }
...
---
name: copy_from_larger_rc_def
alignment: 4
legalized: true
regBankSelected: true
selected: true
tracksRegLiveness: true
liveins:
- { reg: '$x0' }
- { reg: '$w1' }
- { reg: '$x2' }
body: |
bb.1:
liveins: $w1, $x0, $x2
; Show that if we're doing a copy from a large rc to a single user with a smaller rc
; then we just constrain the def instead.
; CHECK-LABEL: name: copy_from_larger_rc_def
; CHECK: liveins: $w1, $x0, $x2
; CHECK-NEXT: {{ $}}
; CHECK-NEXT: [[COPY:%[0-9]+]]:gpr64 = COPY $x0
; CHECK-NEXT: %large_rc_def:gpr64common = UBFMXri [[COPY]], 61, 60
; CHECK-NEXT: %add:gpr64sp = ADDXri %large_rc_def, 3, 0
; CHECK-NEXT: $x0 = COPY %add
; CHECK-NEXT: RET_ReallyLR
%0:gpr64 = COPY $x0
%large_rc_def:gpr64 = UBFMXri %0, 61, 60
%constrain_copy:gpr64common = COPY %large_rc_def
; Even though ADDXri may not actually need to use gpr64common, just use it as an example.
%add:gpr64sp = ADDXri %constrain_copy, 3, 0
$x0 = COPY %add
RET_ReallyLR
...
---
name: copy_from_larger_rc_def_multi_use
alignment: 4
legalized: true
regBankSelected: true
selected: true
tracksRegLiveness: true
liveins:
- { reg: '$x0' }
- { reg: '$w1' }
- { reg: '$x2' }
body: |
bb.1:
liveins: $w1, $x0, $x2
; Don't constrain def if the original def has multiple users.
; CHECK-LABEL: name: copy_from_larger_rc_def_multi_use
; CHECK: liveins: $w1, $x0, $x2
; CHECK-NEXT: {{ $}}
; CHECK-NEXT: [[COPY:%[0-9]+]]:gpr64 = COPY $x0
; CHECK-NEXT: %large_rc_def:gpr64 = UBFMXri [[COPY]], 61, 60
; CHECK-NEXT: %constrain_copy:gpr64common = COPY %large_rc_def
; CHECK-NEXT: %add:gpr64sp = ADDXri %constrain_copy, 3, 0
; CHECK-NEXT: %add2:gpr64sp = ADDXri %constrain_copy, 3, 0
; CHECK-NEXT: $x0 = COPY %add
; CHECK-NEXT: $x1 = COPY %large_rc_def
; CHECK-NEXT: RET_ReallyLR
%0:gpr64 = COPY $x0
%large_rc_def:gpr64 = UBFMXri %0, 61, 60
%constrain_copy:gpr64common = COPY %large_rc_def
%add:gpr64sp = ADDXri %constrain_copy, 3, 0
%add2:gpr64sp = ADDXri %constrain_copy, 3, 0
$x0 = COPY %add
$x1 = COPY %large_rc_def
RET_ReallyLR
...
---
name: copy_from_smaller_rc_def
alignment: 4
legalized: true
regBankSelected: true
selected: true
tracksRegLiveness: true
liveins:
- { reg: '$x0' }
- { reg: '$w1' }
- { reg: '$x2' }
body: |
bb.1:
liveins: $w1, $x0, $x2
; Show that if we're doing a copy from a small rc to a single user with a larger rc
; then we just use the smaller def instead of doing a copy.
; CHECK-LABEL: name: copy_from_smaller_rc_def
; CHECK: liveins: $w1, $x0, $x2
; CHECK-NEXT: {{ $}}
; CHECK-NEXT: [[COPY:%[0-9]+]]:gpr64common = COPY $x0
; CHECK-NEXT: [[COPY1:%[0-9]+]]:gpr64common = COPY $x1
; CHECK-NEXT: %add:gpr64common = ADDXri [[COPY1]], 3, 0
; CHECK-NEXT: STRXui [[COPY1]], %add, target-flags(aarch64-pageoff, aarch64-nc) @x :: (store (p0))
; CHECK-NEXT: RET_ReallyLR
%0:gpr64common = COPY $x0
%1:gpr64common = COPY $x1
%add:gpr64common = ADDXri %1, 3, 0
%copy:gpr64sp = COPY %add
STRXui %1, %copy, target-flags(aarch64-pageoff, aarch64-nc) @x :: (store (p0))
RET_ReallyLR
...
|
