You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
138 lines
4.9 KiB
138 lines
4.9 KiB
# RUN: llc -mtriple=thumbv8.1m.main %s -run-pass=arm-low-overhead-loops --verify-machineinstrs -o - | FileCheck %s
|
|
|
|
# CHECK: while.body:
|
|
# CHECK-NOT: t2DLS
|
|
# CHECK-NOT: t2LEUpdate
|
|
|
|
--- |
|
|
target datalayout = "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64"
|
|
target triple = "thumbv8.1m.main"
|
|
|
|
define i32 @skip_spill(i32 %n) #0 {
|
|
entry:
|
|
%cmp6 = icmp eq i32 %n, 0
|
|
br i1 %cmp6, label %while.end, label %while.body.preheader
|
|
|
|
while.body.preheader: ; preds = %entry
|
|
%start = call i32 @llvm.start.loop.iterations.i32(i32 %n)
|
|
br label %while.body
|
|
|
|
while.body: ; preds = %while.body, %while.body.preheader
|
|
%res.07 = phi i32 [ %add, %while.body ], [ 0, %while.body.preheader ]
|
|
%0 = phi i32 [ %start, %while.body.preheader ], [ %1, %while.body ]
|
|
%call = tail call i32 bitcast (i32 (...)* @bar to i32 ()*)()
|
|
%add = add nsw i32 %call, %res.07
|
|
%1 = call i32 @llvm.loop.decrement.reg.i32.i32.i32(i32 %0, i32 1)
|
|
%2 = icmp ne i32 %1, 0
|
|
br i1 %2, label %while.body, label %while.end
|
|
|
|
while.end: ; preds = %while.body, %entry
|
|
%res.0.lcssa = phi i32 [ 0, %entry ], [ %add, %while.body ]
|
|
ret i32 %res.0.lcssa
|
|
}
|
|
|
|
declare i32 @bar(...) local_unnamed_addr #0
|
|
|
|
declare i32 @llvm.start.loop.iterations.i32(i32) #1
|
|
declare i32 @llvm.loop.decrement.reg.i32.i32.i32(i32, i32) #1
|
|
|
|
attributes #0 = { "target-features"="+mve.fp" }
|
|
attributes #1 = { noduplicate nounwind }
|
|
attributes #2 = { nounwind }
|
|
|
|
...
|
|
---
|
|
name: skip_spill
|
|
alignment: 2
|
|
exposesReturnsTwice: false
|
|
legalized: false
|
|
regBankSelected: false
|
|
selected: false
|
|
failedISel: false
|
|
tracksRegLiveness: true
|
|
hasWinCFI: false
|
|
registers: []
|
|
liveins:
|
|
- { reg: '$r0', virtual-reg: '' }
|
|
frameInfo:
|
|
isFrameAddressTaken: false
|
|
isReturnAddressTaken: false
|
|
hasStackMap: false
|
|
hasPatchPoint: false
|
|
stackSize: 16
|
|
offsetAdjustment: 0
|
|
maxAlignment: 4
|
|
adjustsStack: true
|
|
hasCalls: true
|
|
stackProtector: ''
|
|
maxCallFrameSize: 0
|
|
cvBytesOfCalleeSavedRegisters: 0
|
|
hasOpaqueSPAdjustment: false
|
|
hasVAStart: false
|
|
hasMustTailInVarArgFunc: false
|
|
localFrameSize: 0
|
|
savePoint: ''
|
|
restorePoint: ''
|
|
fixedStack: []
|
|
stack:
|
|
- { id: 0, name: '', type: spill-slot, offset: -4, size: 4, alignment: 4,
|
|
stack-id: default, callee-saved-register: '$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: '$r7', callee-saved-restored: true,
|
|
debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
|
|
- { id: 2, name: '', type: spill-slot, offset: -12, size: 4, alignment: 4,
|
|
stack-id: default, callee-saved-register: '$r5', callee-saved-restored: true,
|
|
debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
|
|
- { id: 3, name: '', type: spill-slot, offset: -16, size: 4, alignment: 4,
|
|
stack-id: default, callee-saved-register: '$r4', callee-saved-restored: true,
|
|
debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
|
|
callSites: []
|
|
constants: []
|
|
machineFunctionInfo: {}
|
|
body: |
|
|
bb.0.entry:
|
|
successors: %bb.4(0x30000000), %bb.1(0x50000000)
|
|
liveins: $r0, $r4, $r5, $r7, $lr
|
|
|
|
frame-setup tPUSH 14, $noreg, killed $r4, killed $r5, killed $r7, killed $lr, implicit-def $sp, implicit $sp
|
|
frame-setup CFI_INSTRUCTION def_cfa_offset 16
|
|
frame-setup CFI_INSTRUCTION offset $lr, -4
|
|
frame-setup CFI_INSTRUCTION offset $r7, -8
|
|
frame-setup CFI_INSTRUCTION offset $r5, -12
|
|
frame-setup CFI_INSTRUCTION offset $r4, -16
|
|
tCBZ $r0, %bb.4
|
|
|
|
bb.1.while.body.preheader:
|
|
successors: %bb.2(0x80000000)
|
|
liveins: $r0
|
|
|
|
$lr = tMOVr $r0, 14, $noreg
|
|
renamable $r4, dead $cpsr = tMOVi8 0, 14, $noreg
|
|
$lr = t2DoLoopStart killed $r0
|
|
|
|
bb.2.while.body:
|
|
successors: %bb.2(0x7c000000), %bb.3(0x04000000)
|
|
liveins: $lr, $r4
|
|
|
|
$r5 = tMOVr killed $lr, 14, $noreg
|
|
tBL 14, $noreg, @bar, csr_aapcs, implicit-def dead $lr, implicit $sp, implicit-def $sp, implicit-def $r0
|
|
$lr = tMOVr killed $r5, 14, $noreg
|
|
renamable $r4 = nsw tADDhirr killed renamable $r4, killed renamable $r0, 14, $noreg
|
|
renamable $lr = t2LoopDec killed renamable $lr, 1
|
|
t2LoopEnd renamable $lr, %bb.2, implicit-def dead $cpsr
|
|
tB %bb.3, 14, $noreg
|
|
|
|
bb.3.while.end:
|
|
liveins: $r4
|
|
|
|
$r0 = tMOVr killed $r4, 14, $noreg
|
|
tPOP_RET 14, $noreg, def $r4, def $r5, def $r7, def $pc, implicit killed $r0
|
|
|
|
bb.4:
|
|
renamable $r4, dead $cpsr = tMOVi8 0, 14, $noreg
|
|
$r0 = tMOVr killed $r4, 14, $noreg
|
|
tPOP_RET 14, $noreg, def $r4, def $r5, def $r7, def $pc, implicit killed $r0
|
|
|
|
...
|