146 lines
5.1 KiB
Plaintext
146 lines
5.1 KiB
Plaintext
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# RUN: llc -mtriple=thumbv8.1m.main -run-pass=arm-low-overhead-loops %s --verify-machineinstrs -o - | FileCheck %s
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# CHECK: name: non_loop
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# CHECK: bb.0.entry:
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# CHECK: tBcc %bb.2, 3
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# CHECK: bb.1.not.preheader:
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# CHECK: t2CMPri renamable $lr, 0, 14
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# CHECK: tBcc %bb.4, 0
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# CHECK: tB %bb.2
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# CHECK: bb.3.while.body:
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# CHECK: t2CMPri renamable $lr, 0, 14
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# CHECK: tBcc %bb.3, 1
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# CHECK: tB %bb.4
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# CHECK: bb.4.while.end:
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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"
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define void @non_loop(i16* nocapture %a, i16* nocapture readonly %b, i32 %N) {
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entry:
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%cmp = icmp ugt i32 %N, 2
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br i1 %cmp, label %not.preheader, label %while.body.preheader
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not.preheader: ; preds = %entry
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%test = call i1 @llvm.test.set.loop.iterations.i32(i32 %N)
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br i1 %test, label %while.body.preheader, label %while.end
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while.body.preheader: ; preds = %not.preheader, %entry
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%scevgep = getelementptr i16, i16* %a, i32 -1
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%scevgep3 = getelementptr i16, i16* %b, i32 -1
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br label %while.body
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while.body: ; preds = %while.body, %while.body.preheader
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%lsr.iv4 = phi i16* [ %scevgep3, %while.body.preheader ], [ %scevgep5, %while.body ]
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%lsr.iv = phi i16* [ %scevgep, %while.body.preheader ], [ %scevgep1, %while.body ]
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%count = phi i32 [ %count.next, %while.body ], [ %N, %while.body.preheader ]
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%scevgep7 = getelementptr i16, i16* %lsr.iv, i32 1
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%scevgep4 = getelementptr i16, i16* %lsr.iv4, i32 1
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%load = load i16, i16* %scevgep4, align 2
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store i16 %load, i16* %scevgep7, align 2
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%count.next = call i32 @llvm.loop.decrement.reg.i32.i32.i32(i32 %count, i32 1)
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%cmp1 = icmp ne i32 %count.next, 0
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%scevgep1 = getelementptr i16, i16* %lsr.iv, i32 1
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%scevgep5 = getelementptr i16, i16* %lsr.iv4, i32 1
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br i1 %cmp1, label %while.body, label %while.end
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while.end: ; preds = %while.body, %not.preheader
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ret void
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}
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declare i1 @llvm.test.set.loop.iterations.i32(i32) #0
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declare i32 @llvm.loop.decrement.reg.i32.i32.i32(i32, i32) #0
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declare void @llvm.stackprotector(i8*, i8**) #1
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attributes #0 = { noduplicate nounwind }
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attributes #1 = { nounwind }
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...
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---
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name: non_loop
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alignment: 2
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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: true
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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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callSites: []
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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.2(0x40000000)
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liveins: $r0, $r1, $r2, $r7, $lr
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frame-setup tPUSH 14, $noreg, killed $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 $r7, -8
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$lr = tMOVr $r2, 14, $noreg
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tCMPi8 killed $r2, 3, 14, $noreg, implicit-def $cpsr
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tBcc %bb.2, 3, killed $cpsr
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bb.1.not.preheader:
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successors: %bb.2(0x40000000), %bb.4(0x40000000)
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liveins: $lr, $r0, $r1
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t2WhileLoopStart renamable $lr, %bb.4, implicit-def dead $cpsr
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tB %bb.2, 14, $noreg
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bb.2.while.body.preheader:
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successors: %bb.3(0x80000000)
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liveins: $lr, $r0, $r1
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renamable $r1, dead $cpsr = tSUBi8 killed renamable $r1, 2, 14, $noreg
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renamable $r0, dead $cpsr = tSUBi8 killed renamable $r0, 2, 14, $noreg
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bb.3.while.body:
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successors: %bb.3(0x7c000000), %bb.4(0x04000000)
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liveins: $lr, $r0, $r1
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renamable $r2, renamable $r1 = t2LDRH_PRE killed renamable $r1, 2, 14, $noreg :: (load 2 from %ir.scevgep4)
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early-clobber renamable $r0 = t2STRH_PRE killed renamable $r2, killed renamable $r0, 2, 14, $noreg :: (store 2 into %ir.scevgep7)
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renamable $lr = t2LoopDec killed renamable $lr, 1
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t2LoopEnd renamable $lr, %bb.3, implicit-def dead $cpsr
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tB %bb.4, 14, $noreg
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bb.4.while.end:
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tPOP_RET 14, $noreg, def $r7, def $pc
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...
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