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fda1e859d8
This saves one instruction per prologue/epilogue for any function with an odd number of callee-saved GPRs, but more importantly, allows such functions to match the packed unwind format. Differential Revision: https://reviews.llvm.org/D88699
66 lines
1.7 KiB
YAML
66 lines
1.7 KiB
YAML
# RUN: llc -o - %s -mtriple=aarch64-windows -start-before=prologepilog \
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# RUN: -stop-after=prologepilog | FileCheck %s
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# Check that lr isn't paired with a GPR if it's the first pair, as
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# that can't be described as a SEH opcode if combined with predecrement.
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# CHECK: early-clobber $sp = frame-setup STRXpre killed $x19, $sp, -16
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# CHECK-NEXT: frame-setup SEH_SaveReg_X 19, -16
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# CHECK-NEXT: frame-setup STRXui killed $lr, $sp, 1
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# CHECK-NEXT: frame-setup SEH_SaveReg 30, 8
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# CHECK-NEXT: frame-setup SEH_PrologEnd
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--- |
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define dso_local i32 @func(i32 %a) { ret i32 %a }
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declare dso_local i32 @other()
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...
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---
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name: func
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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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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: 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: 4
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savePoint: ''
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restorePoint: ''
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fixedStack: []
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stack: []
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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:
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liveins: $x0, $x19
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BL @other, csr_aarch64_aapcs, implicit-def dead $lr, implicit $sp, implicit $w0, implicit-def $sp, implicit-def $w0
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$x19 = ADDXrr $x0, $x0
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$x0 = ADDXrr $x0, killed $x19
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RET_ReallyLR
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...
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