llvm/test/CodeGen/PowerPC/alignlongjumptest.mir

# RUN: llc -mcpu=future -mtriple=powerpc64le-unknown-unknown %s \
# RUN:   -start-before=ppc-branch-select -verify-machineinstrs \
# RUN:   -filetype=obj -o - | llvm-objdump --mcpu=future -d -r - | \
# RUN:   FileCheck --check-prefix=CHECK-LE %s
# RUN: llc -mcpu=future -mtriple=powerpc64-unknown-unknown %s \
# RUN:   -start-before=ppc-branch-select -verify-machineinstrs \
# RUN:   -filetype=obj -o - | llvm-objdump --mcpu=future -d -r - | \
# RUN:   FileCheck --check-prefix=CHECK-BE %s

# The purpose of this test is to check that long branches are selected correctly
# when we have prefixed instructions that may require alignment. Prefixed
# instructions may require alignment and so an additional 4 bytes may be added.
# If those 4 bytes put the target of the branch past the range of a short branch
# then we should use a long branch like in this test.

---
name:            longbranchtest
alignment:       16
exposesReturnsTwice: false
legalized:       false
regBankSelected: false
selected:        false
failedISel:      false
tracksRegLiveness: true
hasWinCFI:       false
registers:       []
liveins:
  - { reg: '$x3', virtual-reg: '' }
frameInfo:
  isFrameAddressTaken: false
  isReturnAddressTaken: false
  hasStackMap:     false
  hasPatchPoint:   false
  stackSize:       0
  offsetAdjustment: 0
  maxAlignment:    1
  adjustsStack:    false
  hasCalls:        false
  stackProtector:  ''
  maxCallFrameSize: 0
  cvBytesOfCalleeSavedRegisters: 0
  hasOpaqueSPAdjustment: false
  hasVAStart:      false
  hasMustTailInVarArgFunc: false
  localFrameSize:  0
  savePoint:       []
  restorePoint:    []
fixedStack:      []
stack:           []
callSites:       []
constants:       []
machineFunctionInfo: {}
body:             |
  bb.0.entry:
    successors: %bb.1(0x30000000), %bb.2(0x50000000)
    liveins: $x3
    renamable $cr0 = CMPLWI killed renamable $r3, 0, implicit $x3
    BCC 76, killed renamable $cr0, %bb.1
  bb.2:
    renamable $x3 = LI8 2
    INLINEASM &".space 32744", sideeffect attdialect
    renamable $x3 = PADDI8 $x3, 13
    BLR8 implicit $lr8, implicit $rm, implicit killed $x3
  bb.1:
    renamable $x3 = LI8 1
    INLINEASM &".space 32744", sideeffect attdialect
    renamable $x3 = PADDI8 $x3, 21
    BLR8 implicit $lr8, implicit $rm, implicit killed $x3

...

# Check for the long branch.
# CHECK-LE:         08 00 82 4{{[01]}}   b{{[tf]}}  2, 0xc
# CHECK-LE-NEXT:    fc 7f 00 48   b 0x8004
# CHECK-LE-DAG:     paddi 3, 3, 13, 0
# CHECK-LE-DAG:     paddi 3, 3, 21, 0
# CHECK-LE:         blr
# CHECK-BE:         4{{[01]}} 82 00 08   b{{[tf]}}  2, 0xc
# CHECK-BE-NEXT:    48 00 7f fc   b 0x8004
# CHECK-BE-DAG:     paddi 3, 3, 13, 0
# CHECK-BE-DAG:     paddi 3, 3, 21, 0
# CHECK-BE:         blr