llvm/test/CodeGen/PowerPC/schedule-addi-load.mir

# RUN: llc -mcpu=pwr9 -mtriple powerpc64le-unknown-linux-gnu -start-before machine-scheduler -stop-after machine-scheduler -verify-machineinstrs %s -o - | FileCheck %s
# RUN: llc -mcpu=pwr9 -mtriple powerpc64le-unknown-linux-gnu -disable-ppc-sched-addi-load -start-before machine-scheduler -stop-after machine-scheduler \
# RUN:   -verify-machineinstrs %s -o - | FileCheck --check-prefix=CHECK-DISABLE %s
# RUN: llc -mcpu=pwr8 -mtriple powerpc64le-unknown-linux-gnu -start-before machine-scheduler -stop-after machine-scheduler -verify-machineinstrs %s -o - | FileCheck --check-prefix=CHECK-P8 %s

# Test that if the scheduler moves the addi before the load.
--- |
  target datalayout = "e-m:e-i64:64-n32:64"
  
  define i64 @foo(i8* %p, i8* %q) {
  entry:
    br label %while.cond6.i
  
  while.cond6.i:                                    
    %n.0 = phi i64 [ 0, %entry ], [ %n.1, %while.cond6.i ]
    %conv = and i64 %n.0, 4294967295
    %arrayidx = getelementptr inbounds i8, i8* %p, i64 %conv
    %0 = load i8, i8* %arrayidx, align 1
    %arrayidx4 = getelementptr inbounds i8, i8* %q, i64 %conv
    %1 = load i8, i8* %arrayidx4, align 1
    %cmp = icmp eq i8 %0, %1
    %n.1 = add i64 %conv, 1
    br i1 %cmp, label %while.cond6.i, label %while.end
  
  while.end:                                        
    ret i64 %n.0
  }
  
...
---
name:            foo
alignment:       16
exposesReturnsTwice: false
legalized:       false
regBankSelected: false
selected:        false
failedISel:      false
tracksRegLiveness: true
hasWinCFI:       false
registers:       
  - { id: 0, class: g8rc, preferred-register: '' }
  - { id: 1, class: g8rc, preferred-register: '' }
  - { id: 2, class: g8rc_and_g8rc_nox0, preferred-register: '' }
  - { id: 3, class: g8rc_and_g8rc_nox0, preferred-register: '' }
  - { id: 4, class: g8rc, preferred-register: '' }
  - { id: 5, class: g8rc_and_g8rc_nox0, preferred-register: '' }
  - { id: 6, class: gprc, preferred-register: '' }
  - { id: 7, class: gprc, preferred-register: '' }
  - { id: 8, class: crrc, preferred-register: '' }
  - { id: 9, class: g8rc, preferred-register: '' }
liveins:         
  - { reg: '$x3', virtual-reg: '%2' }
  - { reg: '$x4', virtual-reg: '%3' }
frameInfo:       
  isFrameAddressTaken: false
  isReturnAddressTaken: false
  hasStackMap:     false
  hasPatchPoint:   false
  stackSize:       0
  offsetAdjustment: 0
  maxAlignment:    0
  adjustsStack:    false
  hasCalls:        false
  stackProtector:  ''
  maxCallFrameSize: 4294967295
  cvBytesOfCalleeSavedRegisters: 0
  hasOpaqueSPAdjustment: false
  hasVAStart:      false
  hasMustTailInVarArgFunc: false
  localFrameSize:  0
  savePoint:       ''
  restorePoint:    ''
fixedStack:      []
stack:           []
constants:       []
machineFunctionInfo: {}
body:             |
  bb.0.entry:
    successors: %bb.1(0x80000000)
    liveins: $x3, $x4
  
    %3:g8rc_and_g8rc_nox0 = COPY $x4
    %2:g8rc_and_g8rc_nox0 = COPY $x3
    %9:g8rc = LI8 0
  
  bb.1.while.cond6.i:
    successors: %bb.1(0x7c000000), %bb.2(0x04000000)
  
    %0:g8rc = COPY %9
    %5:g8rc_and_g8rc_nox0 = RLDICL %0, 0, 32
    %6:gprc = LBZX %2, %5 :: (load 1 from %ir.arrayidx)
    %7:gprc = LBZX %3, %5 :: (load 1 from %ir.arrayidx4)
    %9:g8rc = ADDI8 %5, 1
    %8:crrc = CMPLW %6, %7
    BCC 76, %8, %bb.1
    B %bb.2
    ; CHECK-LABEL: foo
    ; CHECK: %5:g8rc_and_g8rc_nox0 = RLDICL %0, 0, 32
    ; CHECK-NEXT: %9:g8rc = ADDI8 %5, 1
    ; CHECK-NEXT: %6:gprc = LBZX %2, %5 :: (load 1 from %ir.arrayidx) 
    ; CHECK-NEXT: %7:gprc = LBZX %3, %5 :: (load 1 from %ir.arrayidx4) 
    ; CHECK-NEXT: %8:crrc = CMPLW %6, %7 
    ; CHECK-NEXT: BCC 76, %8
    ; CHECK-DISABLE-LABEL: foo
    ; CHECK-DISABLE: %5:g8rc_and_g8rc_nox0 = RLDICL %0, 0, 32
    ; CHECK-DISABLE-NEXT: %6:gprc = LBZX %2, %5 :: (load 1 from %ir.arrayidx) 
    ; CHECK-DISABLE-NEXT: %7:gprc = LBZX %3, %5 :: (load 1 from %ir.arrayidx4) 
    ; CHECK-DISABLE-NEXT: %9:g8rc = ADDI8 %5, 1
    ; CHECK-DISABLE-NEXT: %8:crrc = CMPLW %6, %7 
    ; CHECK-DISABLE-NEXT: BCC 76, %8
    ; CHECK-P8-LABEL: foo
    ; CHECK-P8: %5:g8rc_and_g8rc_nox0 = RLDICL %0, 0, 32
    ; CHECK-P8-NEXT: %6:gprc = LBZX %2, %5 :: (load 1 from %ir.arrayidx)
    ; CHECK-P8-NEXT: %7:gprc = LBZX %3, %5 :: (load 1 from %ir.arrayidx4)
    ; CHECK-P8-NEXT: %8:crrc = CMPLW %6, %7
    ; CHECK-P8-NEXT: %9:g8rc = ADDI8 %5, 1
    ; CHECK-P8-NEXT: BCC 76, %8
  
  bb.2.while.end:
    $x3 = COPY %0
    BLR8 implicit $lr8, implicit $rm, implicit $x3

...