llvm/test/CodeGen/PowerPC/shrink-wrap.mir

# RUN: llc -verify-machineinstrs -mcpu=pwr9 -mtriple powerpc64le-unknown-linux-gnu \
# RUN:   -run-pass=shrink-wrap -o - %s | FileCheck %s
--- |
  ; ModuleID = 'test.ll'
  source_filename = "test.ll"
  target datalayout = "e-m:e-i64:64-n32:64"
  
  define signext i32 @shrinkwrapme(i32 signext %a, i32 signext %lim) {
  entry:
    %cmp5 = icmp sgt i32 %lim, 0
    br i1 %cmp5, label %for.body.preheader, label %for.cond.cleanup
  
  for.body.preheader:                               ; preds = %entry
    %0 = add i32 %lim, -1
    %1 = zext i32 %0 to i64
    %2 = add nuw nsw i64 %1, 1
    call void @llvm.set.loop.iterations.i64(i64 %2)
    br label %for.body
  
  for.cond.cleanup:                                 ; preds = %for.body, %entry
    %Ret.0.lcssa = phi i32 [ 0, %entry ], [ %3, %for.body ]
    ret i32 %Ret.0.lcssa
  
  for.body:                                         ; preds = %for.body, %for.body.preheader
    %Ret.06 = phi i32 [ %3, %for.body ], [ 0, %for.body.preheader ]
    %3 = tail call i32 asm "add $0, $1, $2", "=r,r,r,~{r14},~{r15},~{r16},~{r17},~{r18},~{r19},~{r20},~{r21},~{r22},~{r23},~{r24},~{r25},~{r26},~{r27},~{r28},~{r29},~{r30},~{r31}"(i32 %a, i32 %Ret.06)
    %4 = call i1 @llvm.loop.decrement.i64(i64 1)
    br i1 %4, label %for.body, label %for.cond.cleanup
  }
  
  ; Function Attrs: noduplicate nounwind
  declare void @llvm.set.loop.iterations.i64(i64) #0
  
  ; Function Attrs: noduplicate nounwind
  declare i1 @llvm.loop.decrement.i64(i64) #0
  
  ; Function Attrs: nounwind
  declare void @llvm.stackprotector(i8*, i8**) #1
  
  attributes #0 = { noduplicate nounwind }
  attributes #1 = { nounwind }

...
---
name:            shrinkwrapme
alignment:       16
exposesReturnsTwice: false
legalized:       false
regBankSelected: false
selected:        false
failedISel:      false
tracksRegLiveness: true
hasWinCFI:       false
registers:       []
liveins:
  - { reg: '$x3', virtual-reg: '' }
  - { reg: '$x4', virtual-reg: '' }
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:           []
callSites:       []
constants:       []
machineFunctionInfo: {}
body:             |
  bb.0.entry:
    successors: %bb.2(0x50000000), %bb.1(0x30000000)
    liveins: $x3, $x4
  
    renamable $cr0 = CMPWI renamable $r4, 1
    BCC 4, killed renamable $cr0, %bb.2
  
  bb.1:
    successors: %bb.3(0x80000000)
  
    renamable $r4 = LI 0
    B %bb.3
  
  bb.2.for.body.preheader:
    successors: %bb.4(0x80000000)
    liveins: $x3, $x4
  
    renamable $r4 = ADDI renamable $r4, -1, implicit killed $x4, implicit-def $x4
    renamable $x4 = RLDICL killed renamable $x4, 0, 32
    renamable $x4 = nuw nsw ADDI8 killed renamable $x4, 1
    MTCTR8loop killed renamable $x4, implicit-def dead $ctr8
    renamable $r4 = LI 0
    B %bb.4
  
  bb.3.for.cond.cleanup:
    liveins: $r4
  
    renamable $x3 = EXTSW_32_64 killed renamable $r4
    BLR8 implicit $lr8, implicit $rm, implicit $x3
  
  bb.4.for.body:
    successors: %bb.4(0x7c000000), %bb.3(0x04000000)
    liveins: $r4, $x3
  
    INLINEASM &"add $0, $1, $2", 0, 131082, def renamable $r4, 131081, renamable $r3, 131081, killed renamable $r4, 12, implicit-def dead early-clobber $r14, 12, implicit-def dead early-clobber $r15, 12, implicit-def dead early-clobber $r16, 12, implicit-def dead early-clobber $r17, 12, implicit-def dead early-clobber $r18, 12, implicit-def dead early-clobber $r19, 12, implicit-def dead early-clobber $r20, 12, implicit-def dead early-clobber $r21, 12, implicit-def dead early-clobber $r22, 12, implicit-def dead early-clobber $r23, 12, implicit-def dead early-clobber $r24, 12, implicit-def dead early-clobber $r25, 12, implicit-def dead early-clobber $r26, 12, implicit-def dead early-clobber $r27, 12, implicit-def dead early-clobber $r28, 12, implicit-def dead early-clobber $r29, 12, implicit-def dead early-clobber $r30, 12, implicit-def dead early-clobber $r31
    BDNZ8 %bb.4, implicit-def dead $ctr8, implicit $ctr8
    B %bb.3

  ; CHECK:      savePoint:       ''
  ; CHECK-NEXT: restorePoint:    ''

  ; CHECK:      bb.4.for.body:
  ; CHECK-NEXT:   successors: %bb.4(0x7c000000), %bb.3(0x04000000)
  ; CHECK-NEXT:   liveins: $r4, $x3
  ; CHECK:        INLINEASM
  ; CHECK-NEXT:   BDNZ8 %bb.4
  ; CHECK-NEXT:   B %bb.3
...