forked from OSchip/llvm-project
132 lines
4.6 KiB
YAML
132 lines
4.6 KiB
YAML
# RUN: llc -mtriple=thumbv8.1m.main -mattr=+lob %s -run-pass=arm-low-overhead-loops --verify-machineinstrs -o - | FileCheck %s
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# TODO: Remove the lr = tMOVr
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# CHECK: body:
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# CHECK: $lr = t2WLS $r2, [[EXIT:%bb[.0-9]+]]
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# CHECK: [[PREHEADER:bb[.0-9a-z]+]]:
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# CHECK: $lr = tMOVr killed $r2
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# CHECK: [[BODY:bb[.0-9a-z]+]]:
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# CHECK: $lr = t2LEUpdate renamable $lr
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--- |
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target datalayout = "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64"
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target triple = "thumbv8.1m.main-arm-unknown"
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; Function Attrs: norecurse nounwind optsize
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define dso_local arm_aapcscc void @copy(i16* nocapture %a, i16* nocapture readonly %b, i32 %N) {
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entry:
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%cmp4 = icmp eq i32 %N, 0
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%0 = call i1 @llvm.test.set.loop.iterations.i32(i32 %N)
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br i1 %0, label %while.body.preheader, label %while.end
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while.body.preheader: ; preds = %entry
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br label %while.body
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while.body: ; preds = %while.body, %while.body.preheader
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%a.addr.06 = phi i16* [ %incdec.ptr1, %while.body ], [ %a, %while.body.preheader ]
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%b.addr.05 = phi i16* [ %incdec.ptr, %while.body ], [ %b, %while.body.preheader ]
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%1 = phi i32 [ %N, %while.body.preheader ], [ %3, %while.body ]
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%incdec.ptr = getelementptr inbounds i16, i16* %b.addr.05, i32 1
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%2 = load i16, i16* %b.addr.05, align 2, !tbaa !3
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%incdec.ptr1 = getelementptr inbounds i16, i16* %a.addr.06, i32 1
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store i16 %2, i16* %a.addr.06, align 2, !tbaa !3
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%3 = call i32 @llvm.loop.decrement.reg.i32.i32.i32(i32 %1, i32 1)
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%4 = icmp ne i32 %3, 0
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br i1 %4, label %while.body, label %while.end
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while.end: ; preds = %while.body, %entry
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ret void
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}
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declare i1 @llvm.test.set.loop.iterations.i32(i32) #1
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declare i32 @llvm.loop.decrement.reg.i32.i32.i32(i32, i32) #1
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attributes #1 = { noduplicate nounwind }
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attributes #2 = { nounwind }
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!llvm.module.flags = !{!0, !1}
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!0 = !{i32 1, !"wchar_size", i32 4}
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!1 = !{i32 1, !"min_enum_size", i32 4}
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!3 = !{!4, !4, i64 0}
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!4 = !{!"short", !5, i64 0}
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!5 = !{!"omnipotent char", !6, i64 0}
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!6 = !{!"Simple C/C++ TBAA"}
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...
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---
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name: copy
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alignment: 1
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exposesReturnsTwice: false
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legalized: false
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regBankSelected: false
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selected: false
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failedISel: false
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tracksRegLiveness: false
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hasWinCFI: false
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registers: []
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liveins:
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- { reg: '$r0', virtual-reg: '' }
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- { reg: '$r1', virtual-reg: '' }
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- { reg: '$r2', virtual-reg: '' }
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frameInfo:
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isFrameAddressTaken: false
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isReturnAddressTaken: false
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hasStackMap: false
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hasPatchPoint: false
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stackSize: 8
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offsetAdjustment: 0
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maxAlignment: 4
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adjustsStack: false
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hasCalls: false
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stackProtector: ''
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maxCallFrameSize: 0
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cvBytesOfCalleeSavedRegisters: 0
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hasOpaqueSPAdjustment: false
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hasVAStart: false
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hasMustTailInVarArgFunc: false
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localFrameSize: 0
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savePoint: ''
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restorePoint: ''
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fixedStack: []
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stack:
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- { id: 0, name: '', type: spill-slot, offset: -4, size: 4, alignment: 4,
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stack-id: default, callee-saved-register: '$lr', callee-saved-restored: false,
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debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
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- { id: 1, name: '', type: spill-slot, offset: -8, size: 4, alignment: 4,
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stack-id: default, callee-saved-register: '$r7', callee-saved-restored: true,
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debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
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constants: []
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machineFunctionInfo: {}
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body: |
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bb.0.entry:
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successors: %bb.1(0x40000000), %bb.3(0x40000000)
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frame-setup tPUSH 14, $noreg, $r7, killed $lr, implicit-def $sp, implicit $sp
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frame-setup CFI_INSTRUCTION def_cfa_offset 8
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frame-setup CFI_INSTRUCTION offset $lr, -4
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frame-setup CFI_INSTRUCTION offset $r7, -8
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$r7 = frame-setup tMOVr $sp, 14, $noreg
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frame-setup CFI_INSTRUCTION def_cfa_register $r7
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t2WhileLoopStart $r2, %bb.3
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tB %bb.1, 14, $noreg
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bb.1.while.body.preheader:
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successors: %bb.2(0x80000000)
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$lr = tMOVr killed $r2, 14, $noreg
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bb.2.while.body:
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successors: %bb.2(0x7c000000), %bb.3(0x04000000)
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renamable $r2, renamable $r1 = t2LDRH_POST killed renamable $r1, 2, 14, $noreg :: (load 2 from %ir.b.addr.05, !tbaa !3)
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early-clobber renamable $r0 = t2STRH_POST killed renamable $r2, killed renamable $r0, 2, 14, $noreg :: (store 2 into %ir.a.addr.06, !tbaa !3)
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renamable $lr = t2LoopDec killed renamable $lr, 1
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t2LoopEnd renamable $lr, %bb.2
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tB %bb.3, 14, $noreg
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bb.3.while.end:
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tPOP_RET 14, $noreg, def $r7, def $pc
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...
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