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llvm-project/llvm/test/CodeGen/AArch64/machine-outliner-drop-stack...

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[MachineOutliner] Drop candidates that require fixups if it's beneficial If it's a bigger code size win to drop candidates that require stack fixups than to demote every candidate to that variant, the outliner should do that. This happens if the number of bytes taken by calls to functions that don't require fixups, plus the number of bytes that'd be left is less than the number of bytes that it'd take to emit a save + restore for all candidates. Also add tests for each possible new behaviour. - machine-outliner-compatible-candidates shows that when we have candidates that don't use the stack, we can use the default call variant along with the no save/regsave variant. - machine-outliner-all-stack shows that when it's better to fix up the stack, we still will demote all candidates to that case - machine-outliner-drop-stack shows that we can discard candidates that require stack fixups when it would be beneficial to do so. llvm-svn: 348168
2018-12-04 03:11:27 +08:00
# RUN: llc -mtriple=aarch64--- -run-pass=machine-outliner \
# RUN: -verify-machineinstrs %s -o - | FileCheck %s
--- |
define void @no-save1() #0 { ret void }
define void @no-save2() #0 { ret void }
define void @reg-save() #0 { ret void }
define void @stack-save() #0 { ret void }
Migrate function attribute "no-frame-pointer-elim" to "frame-pointer"="all" as cleanups after D56351
2019-12-25 07:52:21 +08:00
attributes #0 = { minsize noinline noredzone "frame-pointer"="all" }
[MachineOutliner] Drop candidates that require fixups if it's beneficial If it's a bigger code size win to drop candidates that require stack fixups than to demote every candidate to that variant, the outliner should do that. This happens if the number of bytes taken by calls to functions that don't require fixups, plus the number of bytes that'd be left is less than the number of bytes that it'd take to emit a save + restore for all candidates. Also add tests for each possible new behaviour. - machine-outliner-compatible-candidates shows that when we have candidates that don't use the stack, we can use the default call variant along with the no save/regsave variant. - machine-outliner-all-stack shows that when it's better to fix up the stack, we still will demote all candidates to that case - machine-outliner-drop-stack shows that we can discard candidates that require stack fixups when it would be beneficial to do so. llvm-svn: 348168
2018-12-04 03:11:27 +08:00
...
---
name: no-save1
tracksRegLiveness: true
body: |
bb.0:
liveins: $lr
$lr = ORRXri $xzr, 1
bb.1:
; CHECK-LABEL: name: no-save1
; CHECK: BL [[FN:@OUTLINED_FUNCTION_[0-9]+]]
; CHECK-NOT: STRXpre
; CHECK-NOT: $lr =
; CHECK-NOT: ORRXrs
$x12 = ADDXri $sp, 48, 0;
$x12 = ADDXri $sp, 48, 0;
$x12 = ADDXri $sp, 48, 0;
$x12 = ADDXri $sp, 48, 0;
$x12 = ADDXri $sp, 48, 0;
bb.2:
RET undef $lr
...
---
name: no-save2
tracksRegLiveness: true
body: |
bb.0:
liveins: $lr
$lr = ORRXri $xzr, 1
bb.1:
; CHECK-LABEL: name: no-save2
; CHECK: BL [[FN]]
; CHECK-NOT: STRXpre
; CHECK-NOT: $lr =
; CHECK-NOT: ORRXrs
$x12 = ADDXri $sp, 48, 0;
$x12 = ADDXri $sp, 48, 0;
$x12 = ADDXri $sp, 48, 0;
$x12 = ADDXri $sp, 48, 0;
$x12 = ADDXri $sp, 48, 0;
bb.2:
RET undef $lr
...
---
name: reg-save
tracksRegLiveness: true
body: |
bb.0:
liveins: $lr
$lr = ORRXri $xzr, 1
bb.1:
liveins: $lr
; CHECK-LABEL: name: reg-save
; CHECK: $[[REG:x[0-9]+]] = ORRXrs $xzr, $lr, 0
; CHECK-NEXT: BL [[FN]]
; CHECK-NEXT: $lr = ORRXrs $xzr, $[[REG]], 0
$x12 = ADDXri $sp, 48, 0;
$x12 = ADDXri $sp, 48, 0;
$x12 = ADDXri $sp, 48, 0;
$x12 = ADDXri $sp, 48, 0;
$x12 = ADDXri $sp, 48, 0;
bb.2:
liveins: $lr
RET undef $lr
...
---
name: stack-save
tracksRegLiveness: true
body: |
bb.0:
liveins: $lr, $x0, $x1, $x2, $x3, $x4, $x5, $x6, $x7, $x8, $x9, $x10, $x11, $x12, $x13, $x14, $x15, $x18, $x19, $x20, $x21, $x22, $x23, $x20, $x21, $x22, $x23, $x24, $x25, $x26, $x27, $x28, $fp
$lr = ORRXri $xzr, 1
bb.1:
liveins: $lr, $x0, $x1, $x2, $x3, $x4, $x5, $x6, $x7, $x8, $x9, $x10, $x11, $x12, $x13, $x14, $x15, $x18, $x19, $x20, $x21, $x22, $x23, $x20, $x21, $x22, $x23, $x24, $x25, $x26, $x27, $x28, $fp
; CHECK-LABEL: name: stack-save
; CHECK-NOT: BL
$x12 = ADDXri $sp, 48, 0;
$x12 = ADDXri $sp, 48, 0;
$x12 = ADDXri $sp, 48, 0;
$x12 = ADDXri $sp, 48, 0;
$x12 = ADDXri $sp, 48, 0;
bb.2:
liveins: $lr, $x0, $x1, $x2, $x3, $x4, $x5, $x6, $x7, $x8, $x9, $x10, $x11, $x12, $x13, $x14, $x15, $x18, $x19, $x20, $x21, $x22, $x23, $x20, $x21, $x22, $x23, $x24, $x25, $x26, $x27, $x28, $fp
RET undef $lr