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94c00d2e59
As of today we only use .cfi_offset to specify the offset of a CSR, but we never use .cfi_restore when the CSR is restored. If we want to perform a more advanced type of shrink-wrapping, we need to use .cfi_restore in order to switch the CFI state between blocks. This patch only aims at adding support for the directive. Differential Revision: https://reviews.llvm.org/D36114 llvm-svn: 317199
38 lines
1.2 KiB
YAML
38 lines
1.2 KiB
YAML
# RUN: llc -mtriple=aarch64-- -start-after prologepilog -o - %s | FileCheck %s
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---
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name: fun
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# CHECK: .cfi_startproc
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tracksRegLiveness: true
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frameInfo:
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stackSize: 16
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maxAlignment: 8
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hasCalls: true
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stack:
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- { id: 0, type: spill-slot, offset: -8, size: 8, alignment: 8, stack-id: 0,
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callee-saved-register: '%lr' }
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- { id: 1, type: spill-slot, offset: -16, size: 8, alignment: 8, stack-id: 0,
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callee-saved-register: '%fp' }
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body: |
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bb.0:
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liveins: %fp, %lr
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%sp = frame-setup SUBXri %sp, 16, 0
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frame-setup STRXui killed %fp, %sp, 0 :: (store 8 into %stack.1)
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frame-setup CFI_INSTRUCTION offset %w29, -16
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; CHECK: .cfi_offset w29, -16
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frame-setup STRXui killed %lr, %sp, 1 :: (store 8 into %stack.0)
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frame-setup CFI_INSTRUCTION offset %w30, -8
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; CHECK: .cfi_offset w30, -8
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%fp = frame-setup ADDXri %sp, 0, 0
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frame-setup CFI_INSTRUCTION def_cfa %w29, 16
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%lr = LDRXui %sp, 1 :: (load 8 from %stack.0)
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CFI_INSTRUCTION restore %w30
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; CHECK: .cfi_restore w30
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%fp = LDRXui %sp, 0 :: (load 8 from %stack.1)
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CFI_INSTRUCTION restore %w29
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; CHECK: .cfi_restore w29
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%sp = ADDXri %sp, 16, 0
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RET_ReallyLR
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; CHECK: .cfi_endproc
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...
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