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llvm-project/llvm/test/CodeGen/AArch64/GlobalISel/store-merging-debug.mir
Amara Emerson 29c851f4e2 [GlobalISel] Move the truncstore_merge combine to the LoadStoreOpt pass and add support for an extra case. 
If we have set of mergeable stores of shifts, but the original source value being shifted
is wider than the merged size, we should still be able to merge if we truncate first. To do this
however we need to search for stores speculatively up the block, without knowing exactly how
many stores we should see before we stop. The old algorithm has to match an exact number of
stores to fit the wide type, or it dies. The new one will try to set the wide type to however
many stores we found in the upwards block traversal and use later checks to verify if they're
a valid mergeable set.

The reason I need to move this to LoadStoreOpt is because the combiner works going top down
inside a block, which means that we end up doing partial merges because we haven't seen all
the possible stores before we mutate the MIR. In LoadStoreOpt we can go bottom up.

As a side effect of this change, we also end up doing better on an existing test case (missing_store)
since we manage to do a partial merge there.
2023-04-12 16:43:14 -07:00

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# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
# RUN: llc -mtriple=aarch64-apple-ios -global-isel -global-isel-abort=1 -run-pass=loadstore-opt %s -o - | FileCheck %s
--- |
source_filename = "store-merging-debug.mir"
target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
target triple = "aarch64-apple-ios"
define void @test_simple_4xs16() !dbg !5 {
entry:
call void @llvm.dbg.value(metadata i32 0, metadata !9, metadata !DIExpression()), !dbg !11
unreachable, !dbg !11
}
; Function Attrs: nocallback nofree nosync nounwind readnone speculatable willreturn
declare void @llvm.dbg.value(metadata, metadata, metadata) #0
attributes #0 = { nocallback nofree nosync nounwind readnone speculatable willreturn }
!llvm.dbg.cu = !{!0}
!llvm.mir.debugify = !{!2, !3}
!llvm.debugify = !{!3, !3}
!llvm.module.flags = !{!4}
!0 = distinct !DICompileUnit(language: DW_LANG_C, file: !1, producer: "debugify", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug)
!1 = !DIFile(filename: "store-merging-debug.mir", directory: "/")
!2 = !{i32 16}
!3 = !{i32 1}
!4 = !{i32 2, !"Debug Info Version", i32 3}
!5 = distinct !DISubprogram(name: "test_simple_4xs16", linkageName: "test_simple_4xs16", scope: null, file: !1, line: 1, type: !6, scopeLine: 1, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !8)
!6 = !DISubroutineType(types: !7)
!7 = !{}
!8 = !{!9}
!9 = !DILocalVariable(name: "1", scope: !5, file: !1, line: 1, type: !10)
!10 = !DIBasicType(name: "ty32", size: 32, encoding: DW_ATE_unsigned)
!11 = !DILocation(line: 1, column: 1, scope: !5)
...
---
name: test_simple_4xs16
alignment: 4
exposesReturnsTwice: false
legalized: false
regBankSelected: false
selected: false
failedISel: false
tracksRegLiveness: true
hasWinCFI: false
callsEHReturn: false
callsUnwindInit: false
hasEHCatchret: false
hasEHScopes: false
hasEHFunclets: false
failsVerification: false
tracksDebugUserValues: false
registers:
- { id: 0, class: _, preferred-register: '' }
- { id: 1, class: _, preferred-register: '' }
- { id: 2, class: _, preferred-register: '' }
- { id: 3, class: _, preferred-register: '' }
- { id: 4, class: _, preferred-register: '' }
- { id: 5, class: _, preferred-register: '' }
- { id: 6, class: _, preferred-register: '' }
- { id: 7, class: _, preferred-register: '' }
- { id: 8, class: _, preferred-register: '' }
- { id: 9, class: _, preferred-register: '' }
- { id: 10, class: _, preferred-register: '' }
liveins:
- { reg: '$x0', virtual-reg: '' }
frameInfo:
isFrameAddressTaken: false
isReturnAddressTaken: false
hasStackMap: false
hasPatchPoint: false
stackSize: 0
offsetAdjustment: 0
maxAlignment: 1
adjustsStack: false
hasCalls: false
stackProtector: ''
functionContext: ''
maxCallFrameSize: 0
cvBytesOfCalleeSavedRegisters: 0
hasOpaqueSPAdjustment: false
hasVAStart: false
hasMustTailInVarArgFunc: false
hasTailCall: false
localFrameSize: 0
savePoint: ''
restorePoint: ''
fixedStack: []
stack: []
callSites: []
debugValueSubstitutions: []
constants: []
machineFunctionInfo: {}
body: |
bb.0:
liveins: $x0
; CHECK-LABEL: name: test_simple_4xs16
; CHECK: liveins: $x0
; CHECK-NEXT: {{ $}}
; CHECK-NEXT: [[COPY:%[0-9]+]]:_(p0) = COPY $x0, debug-location !11
; CHECK-NEXT: DBG_VALUE [[COPY]](p0), $noreg, !9, !DIExpression(), debug-location !11
; CHECK-NEXT: DBG_VALUE %1:_(s16), $noreg, !9, !DIExpression(), debug-location !DILocation(line: 2, column: 1, scope: !5)
; CHECK-NEXT: DBG_VALUE %4:_(s16), $noreg, !9, !DIExpression(), debug-location !DILocation(line: 3, column: 1, scope: !5)
; CHECK-NEXT: DBG_VALUE %7:_(s16), $noreg, !9, !DIExpression(), debug-location !DILocation(line: 4, column: 1, scope: !5)
; CHECK-NEXT: DBG_VALUE %10:_(s16), $noreg, !9, !DIExpression(), debug-location !DILocation(line: 5, column: 1, scope: !5)
; CHECK-NEXT: DBG_VALUE 0, $noreg, !9, !DIExpression(), debug-location !DILocation(line: 6, column: 1, scope: !5)
; CHECK-NEXT: DBG_VALUE %2:_(s64), $noreg, !9, !DIExpression(), debug-location !DILocation(line: 7, column: 1, scope: !5)
; CHECK-NEXT: DBG_VALUE %3:_(p0), $noreg, !9, !DIExpression(), debug-location !DILocation(line: 8, column: 1, scope: !5)
; CHECK-NEXT: DBG_VALUE 1, $noreg, !9, !DIExpression(), debug-location !DILocation(line: 9, column: 1, scope: !5)
; CHECK-NEXT: DBG_VALUE %5:_(s64), $noreg, !9, !DIExpression(), debug-location !DILocation(line: 10, column: 1, scope: !5)
; CHECK-NEXT: DBG_VALUE %6:_(p0), $noreg, !9, !DIExpression(), debug-location !DILocation(line: 11, column: 1, scope: !5)
; CHECK-NEXT: DBG_VALUE 2, $noreg, !9, !DIExpression(), debug-location !DILocation(line: 12, column: 1, scope: !5)
; CHECK-NEXT: DBG_VALUE %8:_(s64), $noreg, !9, !DIExpression(), debug-location !DILocation(line: 13, column: 1, scope: !5)
; CHECK-NEXT: DBG_VALUE %9:_(p0), $noreg, !9, !DIExpression(), debug-location !DILocation(line: 14, column: 1, scope: !5)
; CHECK-NEXT: [[C:%[0-9]+]]:_(s64) = G_CONSTANT i64 3940688328982532
; CHECK-NEXT: G_STORE [[C]](s64), [[COPY]](p0), debug-location !DILocation(line: 9, scope: !5) :: (store (s64), align 2)
; CHECK-NEXT: DBG_VALUE 3, $noreg, !9, !DIExpression(), debug-location !DILocation(line: 15, column: 1, scope: !5)
; CHECK-NEXT: RET_ReallyLR debug-location !DILocation(line: 16, column: 1, scope: !5)
%0:_(p0) = COPY $x0, debug-location !11
DBG_VALUE %0(p0), $noreg, !9, !DIExpression(), debug-location !11
%1:_(s16) = G_CONSTANT i16 4, debug-location !DILocation(line: 2, column: 1, scope: !5)
DBG_VALUE %1(s16), $noreg, !9, !DIExpression(), debug-location !DILocation(line: 2, column: 1, scope: !5)
%4:_(s16) = G_CONSTANT i16 5, debug-location !DILocation(line: 3, column: 1, scope: !5)
DBG_VALUE %4(s16), $noreg, !9, !DIExpression(), debug-location !DILocation(line: 3, column: 1, scope: !5)
%7:_(s16) = G_CONSTANT i16 9, debug-location !DILocation(line: 4, column: 1, scope: !5)
DBG_VALUE %7(s16), $noreg, !9, !DIExpression(), debug-location !DILocation(line: 4, column: 1, scope: !5)
%10:_(s16) = G_CONSTANT i16 14, debug-location !DILocation(line: 5, column: 1, scope: !5)
DBG_VALUE %10(s16), $noreg, !9, !DIExpression(), debug-location !DILocation(line: 5, column: 1, scope: !5)
G_STORE %1(s16), %0(p0), debug-location !DILocation(line: 9, column: 1, scope: !5) :: (store (s16))
DBG_VALUE 0, $noreg, !9, !DIExpression(), debug-location !DILocation(line: 6, column: 1, scope: !5)
%2:_(s64) = G_CONSTANT i64 2, debug-location !DILocation(line: 7, column: 1, scope: !5)
DBG_VALUE %2(s64), $noreg, !9, !DIExpression(), debug-location !DILocation(line: 7, column: 1, scope: !5)
%3:_(p0) = G_PTR_ADD %0, %2(s64), debug-location !DILocation(line: 8, column: 1, scope: !5)
DBG_VALUE %3(p0), $noreg, !9, !DIExpression(), debug-location !DILocation(line: 8, column: 1, scope: !5)
G_STORE %4(s16), %3(p0), debug-location !DILocation(line: 9, column: 1, scope: !5) :: (store (s16))
DBG_VALUE 1, $noreg, !9, !DIExpression(), debug-location !DILocation(line: 9, column: 1, scope: !5)
%5:_(s64) = G_CONSTANT i64 4, debug-location !DILocation(line: 10, column: 1, scope: !5)
DBG_VALUE %5(s64), $noreg, !9, !DIExpression(), debug-location !DILocation(line: 10, column: 1, scope: !5)
%6:_(p0) = G_PTR_ADD %0, %5(s64), debug-location !DILocation(line: 11, column: 1, scope: !5)
DBG_VALUE %6(p0), $noreg, !9, !DIExpression(), debug-location !DILocation(line: 11, column: 1, scope: !5)
G_STORE %7(s16), %6(p0), debug-location !DILocation(line: 9, column: 4, scope: !5) :: (store (s16))
DBG_VALUE 2, $noreg, !9, !DIExpression(), debug-location !DILocation(line: 12, column: 1, scope: !5)
%8:_(s64) = G_CONSTANT i64 6, debug-location !DILocation(line: 13, column: 1, scope: !5)
DBG_VALUE %8(s64), $noreg, !9, !DIExpression(), debug-location !DILocation(line: 13, column: 1, scope: !5)
%9:_(p0) = G_PTR_ADD %0, %8(s64), debug-location !DILocation(line: 14, column: 1, scope: !5)
DBG_VALUE %9(p0), $noreg, !9, !DIExpression(), debug-location !DILocation(line: 14, column: 1, scope: !5)
G_STORE %10(s16), %9(p0), debug-location !DILocation(line: 9, column: 4, scope: !5) :: (store (s16))
DBG_VALUE 3, $noreg, !9, !DIExpression(), debug-location !DILocation(line: 15, column: 1, scope: !5)
RET_ReallyLR debug-location !DILocation(line: 16, column: 1, scope: !5)
...
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