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ec8587369b
The current CRBIT spill pseudo-op expansion creates a KILL instruction that kills the CRBIT and defines the enclosing CR field. However, this paints a false picture to the register allocator that all bits in the CR field are killed so copies of other bits out of the field become dead and removable. This changes the expansion to preserve the KILL flag on the CRBIT as an implicit use and to treat the CR field as an undef input. Thanks to Hal Finkel for the review and Uli Weigand for implementation input. Differential revision: https://reviews.llvm.org/D55996 llvm-svn: 350153
122 lines
5.0 KiB
YAML
122 lines
5.0 KiB
YAML
# RUN: llc -mcpu=pwr8 -mtriple=powerpc64le-unknown-linux-gnu -start-after \
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# RUN: virtregrewriter -ppc-asm-full-reg-names -verify-machineinstrs %s \
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# RUN: -o - | FileCheck %s
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--- |
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; ModuleID = 'a.ll'
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source_filename = "a.c"
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target datalayout = "e-m:e-i64:64-n32:64"
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target triple = "powerpc64le-unknown-linux-gnu"
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; Function Attrs: nounwind
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define void @test(i32 signext %a6, i32 signext %a7, i32 signext %a17) local_unnamed_addr #0 {
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entry:
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%cmp27 = icmp slt i32 %a6, %a7
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%cmp29 = icmp sgt i32 %a6, %a17
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%or.cond781 = or i1 %cmp27, %cmp29
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tail call void asm sideeffect "# nothing", "~{cr0},~{cr1},~{cr2},~{cr3},~{cr4},~{cr5},~{cr6},~{cr7},~{memory}"() #1, !srcloc !1
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br label %if.end326
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if.end326: ; preds = %entry
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br i1 %or.cond781, label %if.then330, label %if.end331
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if.then330: ; preds = %if.end326
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unreachable
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if.end331: ; preds = %if.end326
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ret void
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}
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; Function Attrs: nounwind
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declare void @llvm.stackprotector(i8*, i8**) #1
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attributes #0 = { nounwind "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "min-legal-vector-width"="0" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="ppc64le" "target-features"="+altivec,+bpermd,+crypto,+direct-move,+extdiv,+htm,+power8-vector,+vsx,-power9-vector,-qpx" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #1 = { nounwind }
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!llvm.ident = !{!0}
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!0 = !{!"clang version 8.0.0 (trunk 349357)"}
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!1 = !{i32 3373}
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...
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---
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name: test
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alignment: 4
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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: '$x3', virtual-reg: '' }
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- { reg: '$x4', virtual-reg: '' }
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- { reg: '$x5', 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: 0
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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: 4294967295
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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: 0, size: 4, alignment: 4,
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stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
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debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
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- { id: 1, name: '', type: spill-slot, offset: 0, size: 4, alignment: 4,
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stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
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debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
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- { id: 2, name: '', type: spill-slot, offset: 0, size: 4, alignment: 4,
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stack-id: 0, callee-saved-register: '', 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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body: |
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bb.0.entry:
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liveins: $x3, $x4, $x5
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renamable $cr0 = CMPW renamable $r3, renamable $r4, implicit $x4
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renamable $cr1 = CMPW renamable $r3, renamable $r5, implicit $x5, implicit killed $x3
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renamable $cr5lt = CRNOR renamable $cr0lt, renamable $cr1gt, implicit killed $cr0
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renamable $cr5gt = COPY renamable $cr1gt, implicit $cr1
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; CHECK: crnor 4*cr5+lt, lt, 4*cr1+gt
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; CHECK: cror 4*cr5+gt, 4*cr1+gt, 4*cr1+gt
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SPILL_CRBIT killed renamable $cr5lt, 0, %stack.0 :: (store 4 into %stack.0)
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renamable $cr1 = CMPW renamable $r4, renamable $r5, implicit killed $x5, implicit killed $x4
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SPILL_CRBIT killed renamable $cr5gt, 0, %stack.1 :: (store 4 into %stack.1)
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SPILL_CRBIT killed renamable $cr1gt, 0, %stack.2 :: (store 4 into %stack.2)
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INLINEASM &"# nothing", 25, 12, implicit-def dead early-clobber $cr0, 12, implicit-def dead early-clobber $cr1, 12, implicit-def dead early-clobber $cr2, 12, implicit-def dead early-clobber $cr3, 12, implicit-def dead early-clobber $cr4, 12, implicit-def dead early-clobber $cr5, 12, implicit-def dead early-clobber $cr6, 12, implicit-def dead early-clobber $cr7, !1
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BLR8 implicit $lr8, implicit $rm
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bb.1.if.end326:
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successors: %bb.2(0x00000001), %bb.3(0x7fffffff)
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renamable $cr5lt = RESTORE_CRBIT 0, %stack.0 :: (load 4 from %stack.0)
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renamable $cr5gt = RESTORE_CRBIT 0, %stack.1 :: (load 4 from %stack.1)
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renamable $cr5lt = CROR killed renamable $cr5lt, killed renamable $cr5gt
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BCn killed renamable $cr5lt, %bb.3
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B %bb.2
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bb.2.if.then330:
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successors:
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bb.3.if.end331:
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BLR8 implicit $lr8, implicit $rm
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...
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