llvm/test/CodeGen/X86/statepoint-fastregalloc.mir

# RUN: llc -mtriple=x86_64-- -run-pass=regallocfast -o - %s | FileCheck %s
# RUN: llc -mtriple=x86_64-- -passes=regallocfast -o - %s | FileCheck %s

# Check that fastregalloc does not displace register assigned to tied def when
# RegMask operand is present. STATEPOINT is an example of such instruction.
# Tied def/use must be assigned to the same register.
---
name:            test_relocate
tracksRegLiveness: true
frameInfo:
  adjustsStack:    true
body:             |
  bb.0.entry:
    liveins: $rdi

    ; CHECK: renamable [[REG:\$[a-z0-9]+]] = STATEPOINT 0, 0, 0, target-flags(x86-plt) 0, 2, 0, 2, 0, 2, 0, 2, 1, renamable [[REG]](tied-def 0)
  
    %1:gr64 = COPY $rdi
    ADJCALLSTACKDOWN64 0, 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
    %1:gr64 = STATEPOINT 0, 0, 0, target-flags(x86-plt) 0, 2, 0, 2, 0, 2, 0, 2, 1, %1(tied-def 0), 2, 0, 2, 1, 0, 0, csr_64, implicit-def $rsp, implicit-def $ssp
    ADJCALLSTACKUP64 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
    $rax = COPY %1
    RET 0, killed $rax
...

# Same as above but with multiple RegMask operands per instruction.
# These regmasks have no real meaning and chosen to allow only single register to be assignable ($rbp)
---
name:            test_relocate_multi_regmasks
tracksRegLiveness: true
frameInfo:
  adjustsStack:    true
body:             |
  bb.0.entry:
    liveins: $rdi

    ; CHECK: renamable $rbp = STATEPOINT 0, 0, 0, target-flags(x86-plt) 0, 2, 0, 2, 0, 2, 0, 2, 1, renamable $rbp(tied-def 0)

    %1:gr64 = COPY $rdi
    ADJCALLSTACKDOWN64 0, 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
    %1:gr64 = STATEPOINT 0, 0, 0, target-flags(x86-plt) 0, 2, 0, 2, 0, 2, 0, 2, 1, %1(tied-def 0), 2, 0, 2, 1, 0, 0, csr_64_rt_allregs, csr_64_cxx_tls_darwin_pe, implicit-def $rsp, implicit-def $ssp
    ADJCALLSTACKUP64 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
    $rax = COPY %1
    RET 0, killed $rax
...