File: stack-id-stackslot-scavenging.mir

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llvm-toolchain-19 1%3A19.1.7-3
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# RUN: llc -mtriple=aarch64-none-linux-gnu -start-before=greedy -stop-after=prologepilog %s -o - | FileCheck %s
...
# Ensure that an object with a different stack-id is not allocated to a
# callee-save slot using stack-slot scavenging. This test saves X28 which
# creates a hole in the CSR stack region, but it should not be saved to.
# Instead of saving to SP + 1 (which would be the hole in the region), it
# should save to SP + 2 (since AArch64 codegen currently does not support
# (and thus allocate) objects with a stack-id > 0).
name:            test_no_stackslot_scavenging
# CHECK: name: test_no_stackslot_scavenging
# CHECK: STRXui $x0, $sp, 2
tracksRegLiveness: true
frameInfo:
  maxAlignment:  16
stack:
  - { id: 0, stack-id: noalloc, size: 8, alignment: 8 }
body:             |
  bb.0.entry:
    liveins: $x0
    STRXui $x0, %stack.0, 0
    ; Force preserve a CSR to create a hole in the CSR stack region.
    $x28 = IMPLICIT_DEF
    RET_ReallyLR
---