llvm-project/llvm/test/CodeGen/Mips/compactbranches/compact-branch-implicit-def.mir

# RUN: llc -march=mips64 -mcpu=mips64r6 -start-after=block-placement -o - %s | FileCheck %s

# Check that MipsHazardSchedule sees through basic blocks with transient instructions.
# The mir code in this file isn't representative of the llvm-ir.

--- |
  ; ModuleID = 'test.ll'
  source_filename = "test.c"
  target datalayout = "E-m:e-i8:8:32-i16:16:32-i64:64-n32:64-S128"
  target triple = "mips64-img-linux-gnu"

  ; Function Attrs: nounwind
  define i32 @f(i32 signext %a) {
  entry:
    %retval = alloca i32, align 4
    %a.addr = alloca i32, align 4
    store i32 %a, i32* %a.addr, align 4
    %0 = load i32, i32* %a.addr, align 4
    %cmp = icmp sgt i32 %0, 5
    br i1 %cmp, label %if.then, label %if.else

  if.then:                                          ; preds = %entry
    %1 = load i32, i32* %a.addr, align 4
    %2 = load i32, i32* %a.addr, align 4
    %add = add nsw i32 %1, %2
    store i32 %add, i32* %retval, align 4
    br label %return

  if.else:                                          ; preds = %entry
    %3 = load i32, i32* %a.addr, align 4
    %call = call i32 @g(i32 signext %3)
    store i32 %call, i32* %retval, align 4
    br label %return

  return:                                           ; preds = %if.else, %if.then
    %4 = load i32, i32* %retval, align 4
    ret i32 %4
  }

  declare i32 @g(i32 signext)

  ; Function Attrs: nounwind
  declare void @llvm.stackprotector(i8*, i8**)

  !llvm.ident = !{!0}

  !0 = !{!"clang version 4.0.0 "}

...
---
# CHECK-LABEL: f:
# CHECK: bgtzc
# CHECK-NEXT: nop
# CHECK: bltzc
# CHECK-NEXT: nop
# CHECK: blezc
name:            f
alignment:       3
exposesReturnsTwice: false
legalized:       false
regBankSelected: false
selected:        false
tracksRegLiveness: true
liveins:
  - { reg: '$a0_64' }
  - { reg: '$t9_64' }
calleeSavedRegisters: [ '$fp', '$gp', '$ra', '$d12', '$d13', '$d14', '$d15',
                        '$f24', '$f25', '$f26', '$f27', '$f28', '$f29',
                        '$f30', '$f31', '$fp_64', '$f_hi24', '$f_hi25',
                        '$f_hi26', '$f_hi27', '$f_hi28', '$f_hi29', '$f_hi30',
                        '$f_hi31', '$gp_64', '$ra_64', '$s0', '$s1', '$s2',
                        '$s3', '$s4', '$s5', '$s6', '$s7', '$d24_64', '$d25_64',
                        '$d26_64', '$d27_64', '$d28_64', '$d29_64', '$d30_64',
                        '$d31_64', '$s0_64', '$s1_64', '$s2_64', '$s3_64',
                        '$s4_64', '$s5_64', '$s6_64', '$s7_64' ]
frameInfo:
  isFrameAddressTaken: false
  isReturnAddressTaken: false
  hasStackMap:     false
  hasPatchPoint:   false
  stackSize:       32
  offsetAdjustment: 0
  maxAlignment:    8
  adjustsStack:    true
  hasCalls:        true
  maxCallFrameSize: 0
  hasOpaqueSPAdjustment: false
  hasVAStart:      false
  hasMustTailInVarArgFunc: false
stack:
  - { id: 0, name: retval, offset: -28, size: 4, alignment: 4 }
  - { id: 1, name: a.addr, offset: -32, size: 4, alignment: 4 }
  - { id: 2, type: spill-slot, offset: -8, size: 8, alignment: 8, callee-saved-register: '$ra_64' }
  - { id: 3, type: spill-slot, offset: -16, size: 8, alignment: 8, callee-saved-register: '$fp_64' }
  - { id: 4, type: spill-slot, offset: -24, size: 8, alignment: 8, callee-saved-register: '$gp_64' }
body:             |
  bb.0.entry:
    successors: %bb.1.if.then(0x40000000), %bb.5.if.else(0x40000000)
    liveins: $a0_64, $t9_64, $ra_64, $fp_64, $gp_64

    $sp_64 = DADDiu $sp_64, -32
    CFI_INSTRUCTION def_cfa_offset 32
    SD killed $ra_64, $sp_64, 24 :: (store 8 into %stack.2)
    SD killed $fp_64, $sp_64, 16 :: (store 8 into %stack.3)
    SD killed $gp_64, $sp_64, 8 :: (store 8 into %stack.4)
    CFI_INSTRUCTION offset $ra_64, -8
    CFI_INSTRUCTION offset $fp_64, -16
    CFI_INSTRUCTION offset $gp_64, -24
    CFI_INSTRUCTION def_cfa_register $fp_64
    $at_64 = LUi64 @f
    $v0_64 = DADDu killed $at_64, $t9_64
    SW $a0, $sp_64, 0 :: (store 4 into %ir.a.addr)
    BGTZC $a0, %bb.5.if.else, implicit-def $at

  bb.1.if.then:
    successors: %bb.6.return(0x40000000), %bb.2.if.then(0x40000000)
    liveins: $a0

    BLTZC $a0, %bb.6.return, implicit-def $at

  bb.2.if.then:
    successors: %bb.3.if.else(0x80000000)
    $t8 = IMPLICIT_DEF

  bb.3.if.else:
    successors: %bb.6.return(0x40000000), %bb.4.if.else(0x40000000)
    liveins: $t8

    BLEZC $t8, %bb.6.return, implicit-def $at

  bb.4.if.else:
    successors: %bb.6.return(0x80000000)
    liveins: $t8

    $at = LW $sp_64, 0 :: (dereferenceable load 4 from %ir.a.addr)
    $at = ADDu killed $at, $t8
    SW killed $at, $sp_64, 4 :: (store 4 into %ir.retval)
    J %bb.6.return, implicit-def dead $at

  bb.5.if.else:
    successors: %bb.6.return(0x80000000)
    liveins: $v0_64

    $gp_64 = DADDiu killed $v0_64, @f
    $a0_64 = LW64 $sp_64, 0 :: (dereferenceable load 4 from %ir.a.addr)
    $t9_64 = LD $gp_64, @g :: (load 8 from call-entry @g)
    JALR64Pseudo $t9_64, csr_n64, implicit-def dead $ra, implicit $a0_64, implicit $gp_64, implicit-def $sp, implicit-def $v0
    SW killed $v0, $sp_64, 4 :: (store 4 into %ir.retval)

  bb.6.return:
    $v0 = LW $sp_64, 4 :: (dereferenceable load 4 from %ir.retval)
    $gp_64 = LD $sp_64, 8 :: (load 8 from %stack.4)
    $fp_64 = LD $sp_64, 16 :: (load 8 from %stack.3)
    $ra_64 = LD $sp_64, 24 :: (load 8 from %stack.2)
    $sp_64 = DADDiu $sp_64, 32
    PseudoReturn64 $ra_64

...