3780a4e568
On windows, the callee saved registers in a canonical prologue are ordered starting from a lower register number at a lower stack address (with the possible gap for aligning the stack at the top); this is the opposite order that llvm normally produces. To achieve this, reverse the order of the registers in the assignCalleeSavedSpillSlots callback, to get the stack objects laid out by PrologEpilogInserter in the right order, and adjust computeCalleeSaveRegisterPairs to lay them out from the bottom up. This allows generated prologs more often to match the format that allows the unwind info to be written as packed info. Differential Revision: https://reviews.llvm.org/D88677
60 lines
1.6 KiB
YAML
60 lines
1.6 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 save_reg_x, save_reg
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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 $x22, $sp, 1
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# CHECK-NEXT: frame-setup SEH_SaveReg 22, 8
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# CHECK-NEXT: frame-setup SEH_PrologEnd
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# CHECK: frame-destroy SEH_EpilogStart
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# CHECK-NEXT: $x22 = frame-destroy LDRXui $sp, 1
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# CHECK-NEXT: frame-destroy SEH_SaveReg 22, 8
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# CHECK-NEXT: early-clobber $sp, $x19 = frame-destroy LDRXpost $sp, 16
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# CHECK-NEXT: frame-destroy SEH_SaveReg_X 19, -16
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# CHECK-NEXT: frame-destroy SEH_EpilogEnd
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# CHECK-NEXT: RET_ReallyLR implicit $x0
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...
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---
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name: test
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alignment: 4
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exposesReturnsTwice: false
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legalized: false
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regBankSelected: false
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selected: false
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failedISel: false
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tracksRegLiveness: true
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hasWinCFI: true
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registers:
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liveins:
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- { reg: '$w0', 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: 112
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offsetAdjustment: 0
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maxAlignment: 8
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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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hasOpaqueSPAdjustment: true
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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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constants:
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body: |
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bb.0.entry:
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liveins: $x0, $x1
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$x19 = ADDXrr $x0, killed $x1
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$x22 = ADDXrr killed $x19, $x0
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$x0 = COPY killed $x22
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RET_ReallyLR implicit $x0
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...
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