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clang-p2996/llvm/test/CodeGen/Thumb2/LowOverheadLoops/extract-element.mir
Sam Parker b30adfb529 [ARM][LowOverheadLoops] Liveouts and reductions 
Remove the code that tried to look for reduction patterns, since the
vectorizer and isel can now produce predicated arithmetic instructios
within the loop body. This has required some reorganisation and fixes
around live-out and predication checks, as well as looking for cases
where an input/output is initialised to zero.

Differential Revision: https://reviews.llvm.org/D86613
2020-08-28 13:56:16 +01:00

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# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
# RUN: llc -mtriple=thumbv8.1m.main -mattr=+mve -run-pass=arm-low-overhead-loops %s -o - --verify-machineinstrs | FileCheck %s
# Test that the scalar register that aliases a Q reg prevents the tail
# predication.
--- |
define dso_local i32 @no_vpsel_liveout(i16* nocapture readonly %a, i16* nocapture readonly %b, i32 %N) local_unnamed_addr #0 {
entry:
%cmp9 = icmp eq i32 %N, 0
%tmp = add i32 %N, 3
%tmp1 = lshr i32 %tmp, 2
%tmp2 = shl nuw i32 %tmp1, 2
%tmp3 = add i32 %tmp2, -4
%tmp4 = lshr i32 %tmp3, 2
%tmp5 = add nuw nsw i32 %tmp4, 1
br i1 %cmp9, label %for.cond.cleanup, label %vector.ph
vector.ph: ; preds = %entry
call void @llvm.set.loop.iterations.i32(i32 %tmp5)
br label %vector.body
vector.body: ; preds = %vector.body, %vector.ph
%lsr.iv1 = phi i32 [ %lsr.iv.next, %vector.body ], [ %tmp5, %vector.ph ]
%lsr.iv18 = phi i16* [ %scevgep19, %vector.body ], [ %b, %vector.ph ]
%lsr.iv = phi i16* [ %scevgep, %vector.body ], [ %a, %vector.ph ]
%vec.phi = phi <4 x i32> [ zeroinitializer, %vector.ph ], [ %tmp13, %vector.body ]
%tmp7 = phi i32 [ %N, %vector.ph ], [ %tmp9, %vector.body ]
%lsr.iv17 = bitcast i16* %lsr.iv to <4 x i16>*
%lsr.iv1820 = bitcast i16* %lsr.iv18 to <4 x i16>*
%tmp8 = call <4 x i1> @llvm.arm.mve.vctp32(i32 %tmp7)
%tmp9 = sub i32 %tmp7, 4
%wide.masked.load = call <4 x i16> @llvm.masked.load.v4i16.p0v4i16(<4 x i16>* %lsr.iv17, i32 2, <4 x i1> %tmp8, <4 x i16> undef)
%tmp10 = sext <4 x i16> %wide.masked.load to <4 x i32>
%wide.masked.load14 = call <4 x i16> @llvm.masked.load.v4i16.p0v4i16(<4 x i16>* %lsr.iv1820, i32 2, <4 x i1> %tmp8, <4 x i16> undef)
%tmp11 = sext <4 x i16> %wide.masked.load14 to <4 x i32>
%tmp12 = mul nsw <4 x i32> %tmp11, %tmp10
%tmp13 = add <4 x i32> %tmp12, %vec.phi
%scevgep = getelementptr i16, i16* %lsr.iv, i32 4
%scevgep19 = getelementptr i16, i16* %lsr.iv18, i32 4
%tmp14 = call i32 @llvm.loop.decrement.reg.i32.i32.i32(i32 %lsr.iv1, i32 1)
%tmp15 = icmp ne i32 %tmp14, 0
%lsr.iv.next = add nsw i32 %lsr.iv1, -1
br i1 %tmp15, label %vector.body, label %middle.block
middle.block: ; preds = %vector.body
%tmp16 = extractelement <4 x i32> %tmp13, i32 3
br label %for.cond.cleanup
for.cond.cleanup: ; preds = %middle.block, %entry
%res.0.lcssa = phi i32 [ 0, %entry ], [ %tmp16, %middle.block ]
ret i32 %res.0.lcssa
}
declare <4 x i16> @llvm.masked.load.v4i16.p0v4i16(<4 x i16>*, i32 immarg, <4 x i1>, <4 x i16>)
declare void @llvm.set.loop.iterations.i32(i32)
declare i32 @llvm.loop.decrement.reg.i32.i32.i32(i32, i32)
declare <4 x i1> @llvm.arm.mve.vctp32(i32)
...
---
name: no_vpsel_liveout
alignment: 2
exposesReturnsTwice: false
legalized: false
regBankSelected: false
selected: false
failedISel: false
tracksRegLiveness: true
hasWinCFI: false
registers: []
liveins:
- { reg: '$r0', virtual-reg: '' }
- { reg: '$r1', virtual-reg: '' }
- { reg: '$r2', virtual-reg: '' }
frameInfo:
isFrameAddressTaken: false
isReturnAddressTaken: false
hasStackMap: false
hasPatchPoint: false
stackSize: 8
offsetAdjustment: 0
maxAlignment: 4
adjustsStack: false
hasCalls: false
stackProtector: ''
maxCallFrameSize: 0
cvBytesOfCalleeSavedRegisters: 0
hasOpaqueSPAdjustment: false
hasVAStart: false
hasMustTailInVarArgFunc: false
localFrameSize: 0
savePoint: ''
restorePoint: ''
fixedStack: []
stack:
- { id: 0, name: '', type: spill-slot, offset: -4, size: 4, alignment: 4,
stack-id: default, callee-saved-register: '$lr', callee-saved-restored: false,
debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
- { id: 1, name: '', type: spill-slot, offset: -8, size: 4, alignment: 4,
stack-id: default, callee-saved-register: '$r7', callee-saved-restored: true,
debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
callSites: []
constants: []
machineFunctionInfo: {}
body: |
; CHECK-LABEL: name: no_vpsel_liveout
; CHECK: bb.0.entry:
; CHECK: successors: %bb.1(0x80000000)
; CHECK: liveins: $lr, $r0, $r1, $r2, $r7
; CHECK: tCMPi8 renamable $r2, 0, 14 /* CC::al */, $noreg, implicit-def $cpsr
; CHECK: t2IT 0, 4, implicit-def $itstate
; CHECK: renamable $r0 = tMOVi8 $noreg, 0, 0 /* CC::eq */, $cpsr, implicit killed $r0, implicit $itstate
; CHECK: tBX_RET 0 /* CC::eq */, killed $cpsr, implicit $r0, implicit killed $itstate
; CHECK: bb.1.vector.ph:
; CHECK: successors: %bb.2(0x80000000)
; CHECK: liveins: $lr, $r0, $r1, $r2, $r7
; CHECK: frame-setup tPUSH 14 /* CC::al */, $noreg, killed $r7, killed $lr, implicit-def $sp, implicit $sp
; CHECK: frame-setup CFI_INSTRUCTION def_cfa_offset 8
; CHECK: frame-setup CFI_INSTRUCTION offset $lr, -4
; CHECK: frame-setup CFI_INSTRUCTION offset $r7, -8
; CHECK: renamable $q0 = MVE_VMOVimmi32 0, 0, $noreg, undef renamable $q0
; CHECK: $lr = MVE_DLSTP_32 killed renamable $r2
; CHECK: bb.2.vector.body:
; CHECK: successors: %bb.2(0x7c000000), %bb.3(0x04000000)
; CHECK: liveins: $lr, $q0, $r0, $r1
; CHECK: renamable $r0, renamable $q1 = MVE_VLDRHS32_post killed renamable $r0, 8, 0, $noreg :: (load 8 from %ir.lsr.iv17, align 2)
; CHECK: renamable $r1, renamable $q2 = MVE_VLDRHS32_post killed renamable $r1, 8, 0, killed $noreg :: (load 8 from %ir.lsr.iv1820, align 2)
; CHECK: renamable $q1 = nsw MVE_VMULi32 killed renamable $q2, killed renamable $q1, 0, $noreg, undef renamable $q1
; CHECK: renamable $q0 = MVE_VADDi32 killed renamable $q1, killed renamable $q0, 0, $noreg, undef renamable $q0
; CHECK: $lr = MVE_LETP killed renamable $lr, %bb.2
; CHECK: bb.3.middle.block:
; CHECK: liveins: $q0
; CHECK: $r0 = VMOVRS killed $s3, 14 /* CC::al */, $noreg, implicit killed $q0
; CHECK: tPOP_RET 14 /* CC::al */, $noreg, def $r7, def $pc, implicit killed $r0
bb.0.entry:
successors: %bb.1(0x80000000)
liveins: $r0, $r1, $r2, $lr, $r7
tCMPi8 renamable $r2, 0, 14, $noreg, implicit-def $cpsr
t2IT 0, 4, implicit-def $itstate
renamable $r0 = tMOVi8 $noreg, 0, 0, $cpsr, implicit killed $r0, implicit $itstate
tBX_RET 0, killed $cpsr, implicit $r0, implicit killed $itstate
bb.1.vector.ph:
successors: %bb.2(0x80000000)
liveins: $r0, $r1, $r2, $lr, $r7
frame-setup tPUSH 14, $noreg, killed $r7, killed $lr, implicit-def $sp, implicit $sp
frame-setup CFI_INSTRUCTION def_cfa_offset 8
frame-setup CFI_INSTRUCTION offset $lr, -4
frame-setup CFI_INSTRUCTION offset $r7, -8
renamable $r3, dead $cpsr = tADDi3 renamable $r2, 3, 14, $noreg
renamable $q0 = MVE_VMOVimmi32 0, 0, $noreg, undef renamable $q0
renamable $r3 = t2BICri killed renamable $r3, 3, 14, $noreg, $noreg
renamable $r12 = t2SUBri killed renamable $r3, 4, 14, $noreg, $noreg
renamable $r3, dead $cpsr = tMOVi8 1, 14, $noreg
renamable $r12 = nuw nsw t2ADDrs killed renamable $r3, killed renamable $r12, 19, 14, $noreg, $noreg
t2DoLoopStart renamable $r12
$r3 = tMOVr killed $r12, 14, $noreg
bb.2.vector.body:
successors: %bb.2(0x7c000000), %bb.3(0x04000000)
liveins: $q0, $r0, $r1, $r2, $r3
renamable $vpr = MVE_VCTP32 renamable $r2, 0, $noreg
MVE_VPST 4, implicit $vpr
renamable $r0, renamable $q1 = MVE_VLDRHS32_post killed renamable $r0, 8, 1, renamable $vpr :: (load 8 from %ir.lsr.iv17, align 2)
renamable $r1, renamable $q2 = MVE_VLDRHS32_post killed renamable $r1, 8, 1, killed renamable $vpr :: (load 8 from %ir.lsr.iv1820, align 2)
$lr = tMOVr $r3, 14, $noreg
renamable $q1 = nsw MVE_VMULi32 killed renamable $q2, killed renamable $q1, 0, $noreg, undef renamable $q1
renamable $r3, dead $cpsr = nsw tSUBi8 killed $r3, 1, 14, $noreg
renamable $r2, dead $cpsr = tSUBi8 killed renamable $r2, 4, 14, $noreg
renamable $q0 = MVE_VADDi32 killed renamable $q1, killed renamable $q0, 0, $noreg, undef renamable $q0
renamable $lr = t2LoopDec killed renamable $lr, 1
t2LoopEnd killed renamable $lr, %bb.2, implicit-def dead $cpsr
tB %bb.3, 14, $noreg
bb.3.middle.block:
liveins: $q0
$r0 = VMOVRS killed $s3, 14, $noreg, implicit $q0
tPOP_RET 14, $noreg, def $r7, def $pc, implicit killed $r0
...
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