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llvm-project/llvm/test/CodeGen/AArch64/loop-sink-limit.mir
Sjoerd Meijer 7f3170ec19 [MachineSink] Add a loop sink limit 
To make sure compile-times don't regress, add an option to restrict the number
of instructions considered for sinking as alias analysis can be expensive and
for the same reason also skip large blocks.

Differential Revision: https://reviews.llvm.org/D96485
2021-02-17 08:50:53 +00:00

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# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
# RUN: llc -mtriple aarch64 -run-pass=machine-sink -sink-insts-to-avoid-spills \
# RUN: -machine-sink-loop-limit=1 -verify-machineinstrs %s -o - 2>&1 | \
# RUN: FileCheck %s --check-prefix=SINK1
#
# RUN: llc -mtriple aarch64 -run-pass=machine-sink -sink-insts-to-avoid-spills \
# RUN: -machine-sink-loop-limit=2 -verify-machineinstrs %s -o - 2>&1 | \
# RUN: FileCheck %s --check-prefix=SINK2
--- |
target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
target triple = "aarch64"
@A = external dso_local global [100 x i32], align 4
%struct.A = type { i32, i32, i32, i32, i32, i32 }
define i32 @do_sink_use_is_not_a_copy(i32 %n) {
entry:
%cmp63 = icmp sgt i32 %n, 0
br i1 %cmp63, label %for.body.preheader, label %for.cond.cleanup
for.body.preheader: ; preds = %entry
%0 = load i32, i32* getelementptr inbounds ([100 x i32], [100 x i32]* @A, i64 0, i64 0), align 4
br label %for.body
for.cond.cleanup: ; preds = %for.body, %entry
%sum.0.lcssa = phi i32 [ %n, %entry ], [ %div, %for.body ]
ret i32 %sum.0.lcssa
for.body: ; preds = %for.body, %for.body.preheader
%lsr.iv = phi i32 [ %n, %for.body.preheader ], [ %lsr.iv.next, %for.body ]
%sum.065 = phi i32 [ %div, %for.body ], [ %n, %for.body.preheader ]
%div = sdiv i32 %sum.065, %0
%lsr.iv.next = add i32 %lsr.iv, -1
%exitcond.not = icmp eq i32 %lsr.iv.next, 0
br i1 %exitcond.not, label %for.cond.cleanup, label %for.body
}
...
---
name: do_sink_use_is_not_a_copy
alignment: 4
exposesReturnsTwice: false
legalized: false
regBankSelected: false
selected: false
failedISel: false
tracksRegLiveness: true
hasWinCFI: false
registers:
- { id: 0, class: gpr32, preferred-register: '' }
- { id: 1, class: gpr32all, preferred-register: '' }
- { id: 2, class: gpr32sp, preferred-register: '' }
- { id: 3, class: gpr32, preferred-register: '' }
- { id: 4, class: gpr32all, preferred-register: '' }
- { id: 5, class: gpr32all, preferred-register: '' }
- { id: 6, class: gpr32common, preferred-register: '' }
- { id: 7, class: gpr32, preferred-register: '' }
- { id: 8, class: gpr64common, preferred-register: '' }
- { id: 9, class: gpr32, preferred-register: '' }
- { id: 10, class: gpr32, preferred-register: '' }
- { id: 11, class: gpr32, preferred-register: '' }
liveins:
- { reg: '$w0', virtual-reg: '%6' }
frameInfo:
isFrameAddressTaken: false
isReturnAddressTaken: false
hasStackMap: false
hasPatchPoint: false
stackSize: 0
offsetAdjustment: 0
maxAlignment: 1
adjustsStack: false
hasCalls: false
stackProtector: ''
maxCallFrameSize: 0
cvBytesOfCalleeSavedRegisters: 0
hasOpaqueSPAdjustment: false
hasVAStart: false
hasMustTailInVarArgFunc: false
localFrameSize: 0
savePoint: ''
restorePoint: ''
fixedStack: []
stack: []
callSites: []
debugValueSubstitutions: []
constants: []
machineFunctionInfo: {}
body: |
; SINK1-LABEL: name: do_sink_use_is_not_a_copy
; SINK1: bb.0.entry:
; SINK1: successors: %bb.1(0x50000000), %bb.2(0x30000000)
; SINK1: liveins: $w0
; SINK1: [[COPY:%[0-9]+]]:gpr32common = COPY $w0
; SINK1: [[SUBSWri:%[0-9]+]]:gpr32 = SUBSWri [[COPY]], 1, 0, implicit-def $nzcv
; SINK1: Bcc 11, %bb.2, implicit $nzcv
; SINK1: B %bb.1
; SINK1: bb.1.for.body.preheader:
; SINK1: successors: %bb.3(0x80000000)
; SINK1: [[ADRP:%[0-9]+]]:gpr64common = ADRP target-flags(aarch64-page) @A
; SINK1: [[LDRWui:%[0-9]+]]:gpr32 = LDRWui killed [[ADRP]], target-flags(aarch64-pageoff, aarch64-nc) @A :: (dereferenceable load 4 from `i32* getelementptr inbounds ([100 x i32], [100 x i32]* @A, i64 0, i64 0)`)
; SINK1: B %bb.3
; SINK1: bb.2.for.cond.cleanup:
; SINK1: [[PHI:%[0-9]+]]:gpr32all = PHI [[COPY]], %bb.0, %4, %bb.3
; SINK1: $w0 = COPY [[PHI]]
; SINK1: RET_ReallyLR implicit $w0
; SINK1: bb.3.for.body:
; SINK1: successors: %bb.2(0x04000000), %bb.3(0x7c000000)
; SINK1: [[PHI1:%[0-9]+]]:gpr32sp = PHI [[COPY]], %bb.1, %5, %bb.3
; SINK1: [[PHI2:%[0-9]+]]:gpr32 = PHI [[COPY]], %bb.1, %4, %bb.3
; SINK1: [[SDIVWr:%[0-9]+]]:gpr32 = SDIVWr [[PHI2]], [[LDRWui]]
; SINK1: [[COPY1:%[0-9]+]]:gpr32all = COPY [[SDIVWr]]
; SINK1: [[SUBSWri1:%[0-9]+]]:gpr32 = SUBSWri [[PHI1]], 1, 0, implicit-def $nzcv
; SINK1: [[COPY2:%[0-9]+]]:gpr32all = COPY [[SUBSWri1]]
; SINK1: Bcc 0, %bb.2, implicit $nzcv
; SINK1: B %bb.3
; SINK2-LABEL: name: do_sink_use_is_not_a_copy
; SINK2: bb.0.entry:
; SINK2: successors: %bb.1(0x50000000), %bb.2(0x30000000)
; SINK2: liveins: $w0
; SINK2: [[COPY:%[0-9]+]]:gpr32common = COPY $w0
; SINK2: [[SUBSWri:%[0-9]+]]:gpr32 = SUBSWri [[COPY]], 1, 0, implicit-def $nzcv
; SINK2: Bcc 11, %bb.2, implicit $nzcv
; SINK2: B %bb.1
; SINK2: bb.1.for.body.preheader:
; SINK2: successors: %bb.3(0x80000000)
; SINK2: [[ADRP:%[0-9]+]]:gpr64common = ADRP target-flags(aarch64-page) @A
; SINK2: [[LDRWui:%[0-9]+]]:gpr32 = LDRWui killed [[ADRP]], target-flags(aarch64-pageoff, aarch64-nc) @A :: (dereferenceable load 4 from `i32* getelementptr inbounds ([100 x i32], [100 x i32]* @A, i64 0, i64 0)`)
; SINK2: B %bb.3
; SINK2: bb.2.for.cond.cleanup:
; SINK2: [[PHI:%[0-9]+]]:gpr32all = PHI [[COPY]], %bb.0, %4, %bb.3
; SINK2: $w0 = COPY [[PHI]]
; SINK2: RET_ReallyLR implicit $w0
; SINK2: bb.3.for.body:
; SINK2: successors: %bb.2(0x04000000), %bb.3(0x7c000000)
; SINK2: [[PHI1:%[0-9]+]]:gpr32sp = PHI [[COPY]], %bb.1, %5, %bb.3
; SINK2: [[PHI2:%[0-9]+]]:gpr32 = PHI [[COPY]], %bb.1, %4, %bb.3
; SINK2: [[SDIVWr:%[0-9]+]]:gpr32 = SDIVWr [[PHI2]], [[LDRWui]]
; SINK2: [[COPY1:%[0-9]+]]:gpr32all = COPY [[SDIVWr]]
; SINK2: [[SUBSWri1:%[0-9]+]]:gpr32 = SUBSWri [[PHI1]], 1, 0, implicit-def $nzcv
; SINK2: [[COPY2:%[0-9]+]]:gpr32all = COPY [[SUBSWri1]]
; SINK2: Bcc 0, %bb.2, implicit $nzcv
; SINK2: B %bb.3
bb.0.entry:
successors: %bb.1(0x50000000), %bb.2(0x30000000)
liveins: $w0
%6:gpr32common = COPY $w0
%7:gpr32 = SUBSWri %6, 1, 0, implicit-def $nzcv
Bcc 11, %bb.2, implicit $nzcv
B %bb.1
bb.1.for.body.preheader:
successors: %bb.3(0x80000000)
%8:gpr64common = ADRP target-flags(aarch64-page) @A
%9:gpr32 = LDRWui killed %8, target-flags(aarch64-pageoff, aarch64-nc) @A :: (dereferenceable load 4 from `i32* getelementptr inbounds ([100 x i32], [100 x i32]* @A, i64 0, i64 0)`)
B %bb.3
bb.2.for.cond.cleanup:
%1:gpr32all = PHI %6, %bb.0, %4, %bb.3
$w0 = COPY %1
RET_ReallyLR implicit $w0
bb.3.for.body:
successors: %bb.2(0x04000000), %bb.3(0x7c000000)
%2:gpr32sp = PHI %6, %bb.1, %5, %bb.3
%3:gpr32 = PHI %6, %bb.1, %4, %bb.3
%10:gpr32 = SDIVWr %3, %9
%4:gpr32all = COPY %10
%11:gpr32 = SUBSWri %2, 1, 0, implicit-def $nzcv
%5:gpr32all = COPY %11
Bcc 0, %bb.2, implicit $nzcv
B %bb.3
...
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