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dfadfc4259
Summary: Use the FP for scavenged spill slot accesses to prevent corruption of the callee-save region when the SP is re-aligned. Based on problem and patch reported by @paulwalker-arm This is an alternative to solution proposed in D45770 Reviewers: t.p.northover, paulwalker-arm, thegameg, javed.absar Subscribers: qcolombet, mcrosier, paulwalker-arm, kristof.beyls, rengolin, javed.absar, llvm-commits Differential Revision: https://reviews.llvm.org/D46063 llvm-svn: 330976
36 lines
1.2 KiB
YAML
36 lines
1.2 KiB
YAML
# RUN: llc -mtriple=aarch64-none-linux-gnu -run-pass=prologepilog %s -o - | FileCheck %s
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# Ensure references to scavenged stack slots in the CSR area use the
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# FP as a base when the stack pointer must be aligned to something
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# larger than required by the target. This is necessary because the
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# alignment padding area is between the CSR area and the SP, so the SP
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# cannot be used to reference the CSR area.
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name: test
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tracksRegLiveness: true
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frameInfo:
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maxAlignment: 64
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# CHECK: stack:
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# CHECK: id: 0, name: '', type: default, offset: -64, size: 4, alignment: 64
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# CHECK-NEXT: stack-id: 0
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# CHECK-NEXT: local-offset: -64
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# CHECK: id: 1, name: '', type: default, offset: -20, size: 4, alignment: 4
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# CHECK-NEXT: stack-id: 0
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# CHECK-NEXT: local-offset: -68
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stack:
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- { id: 0, size: 4, alignment: 64, local-offset: -64 }
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- { id: 1, size: 4, alignment: 4, local-offset: -68 }
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# CHECK: body:
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# CHECK: $sp = ANDXri killed ${{x[0-9]+}}, 7865
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# CHECK: STRSui $s0, $sp, 0
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# CHECK: STURSi $s0, $fp, -4
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body: |
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bb.0.entry:
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liveins: $s0
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STRSui $s0, %stack.0, 0
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STRSui $s0, %stack.1, 0
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; Force preserve a CSR to create a hole in the CSR stack region.
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$x28 = IMPLICIT_DEF
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RET_ReallyLR
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