llvm/test/CodeGen/PowerPC/sms-regpress.mir

# RUN: llc --verify-machineinstrs -mcpu=pwr9 -o - %s -run-pass=pipeliner -ppc-enable-pipeliner -pipeliner-register-pressure -pipeliner-max-mii=50 -pipeliner-ii-search-range=30 -pipeliner-max-stages=10 -debug-only=pipeliner 2>&1 | FileCheck %s

# REQUIRES: asserts

# Check that if the register pressure is too high, the schedule is rejected, II is incremented, and scheduling continues.
# The specific value of II is not important.

# CHECK: {{^ *}}Try to schedule with {{[0-9]+$}}
# CHECK: {{^ *}}Rejected the schedule because of too high register pressure{{$}}
# CHECK: {{^ *}}Try to schedule with {{[0-9]+$}}
# CHECK: {{^ *}}Schedule Found? 1 (II={{[0-9]+}}){{$}}

--- |
  target datalayout = "e-m:e-Fn32-i64:64-n32:64"
  target triple = "ppc64le"
  
  define dso_local double @kernel(ptr nocapture noundef readonly %a, ptr nocapture noundef readonly %b, i32 noundef signext %n) local_unnamed_addr {
  entry:
    %0 = load double, ptr %a, align 8
    %arrayidx1 = getelementptr inbounds i8, ptr %a, i64 8
    %1 = load double, ptr %arrayidx1, align 8
    %cmp163 = icmp sgt i32 %n, 0
    br i1 %cmp163, label %for.body.preheader, label %for.cond.cleanup
  
  for.body.preheader:                               ; preds = %entry
    %wide.trip.count = zext nneg i32 %n to i64
    %scevgep167 = getelementptr i8, ptr %b, i64 -8
    call void @llvm.set.loop.iterations.i64(i64 %wide.trip.count)
    br label %for.body
  
  for.cond.cleanup:                                 ; preds = %for.body, %entry
    %res.0.lcssa = phi double [ 0.000000e+00, %entry ], [ %30, %for.body ]
    ret double %res.0.lcssa
  
  for.body:                                         ; preds = %for.body.preheader, %for.body
    %res.0165 = phi double [ 0.000000e+00, %for.body.preheader ], [ %30, %for.body ]
    %2 = phi ptr [ %scevgep167, %for.body.preheader ], [ %3, %for.body ]
    %3 = getelementptr i8, ptr %2, i64 8
    %4 = load double, ptr %3, align 8
    %5 = tail call double @llvm.fmuladd.f64(double %0, double %4, double %0)
    %6 = tail call double @llvm.fmuladd.f64(double %5, double %4, double %5)
    %7 = tail call double @llvm.fmuladd.f64(double %6, double %4, double %6)
    %8 = tail call double @llvm.fmuladd.f64(double %7, double %4, double %7)
    %9 = tail call double @llvm.fmuladd.f64(double %8, double %4, double %8)
    %10 = tail call double @llvm.fmuladd.f64(double %9, double %4, double %9)
    %11 = tail call double @llvm.fmuladd.f64(double %10, double %4, double %10)
    %12 = tail call double @llvm.fmuladd.f64(double %11, double %4, double %11)
    %13 = tail call double @llvm.fmuladd.f64(double %12, double %4, double %12)
    %14 = tail call double @llvm.fmuladd.f64(double %13, double %4, double %13)
    %15 = tail call double @llvm.fmuladd.f64(double %14, double %4, double %14)
    %16 = tail call double @llvm.fmuladd.f64(double %15, double %4, double %15)
    %17 = tail call double @llvm.fmuladd.f64(double %16, double %4, double %16)
    %18 = tail call double @llvm.fmuladd.f64(double %17, double %4, double %17)
    %19 = tail call double @llvm.fmuladd.f64(double %18, double %4, double %18)
    %20 = tail call double @llvm.fmuladd.f64(double %19, double %4, double %19)
    %add = fadd double %19, %20
    %21 = tail call double @llvm.fmuladd.f64(double %20, double %4, double %add)
    %add35 = fadd double %12, %21
    %22 = tail call double @llvm.fmuladd.f64(double %5, double %4, double %add35)
    %add38 = fadd double %13, %22
    %23 = tail call double @llvm.fmuladd.f64(double %6, double %4, double %add38)
    %mul = fmul double %4, %7
    %mul46 = fmul double %mul, %14
    %24 = tail call double @llvm.fmuladd.f64(double %mul46, double %13, double %16)
    %mul50 = fmul double %4, %9
    %mul51 = fmul double %1, %mul50
    %25 = tail call double @llvm.fmuladd.f64(double %mul51, double %11, double %24)
    %add53 = fadd double %5, %25
    %add54 = fadd double %6, %add53
    %mul55 = fmul double %14, %16
    %mul56 = fmul double %mul55, %17
    %mul57 = fmul double %mul56, %18
    %26 = tail call double @llvm.fmuladd.f64(double %mul57, double %19, double %add54)
    %27 = tail call double @llvm.fmuladd.f64(double %10, double %1, double %26)
    %28 = tail call double @llvm.fmuladd.f64(double %8, double %6, double %27)
    %mul61 = fmul double %20, %21
    %mul62 = fmul double %mul61, %22
    %29 = tail call double @llvm.fmuladd.f64(double %mul62, double %23, double %28)
    %mul64 = fmul double %26, %29
    %mul65 = fmul double %24, %mul64
    %mul66 = fmul double %12, %mul65
    %30 = tail call double @llvm.fmuladd.f64(double %mul66, double %10, double %res.0165)
    %31 = call i1 @llvm.loop.decrement.i64(i64 1)
    br i1 %31, label %for.body, label %for.cond.cleanup
  }
  
  declare double @llvm.fmuladd.f64(double, double, double)
  
  declare void @llvm.set.loop.iterations.i64(i64)
  
  declare i1 @llvm.loop.decrement.i64(i64)
  
...
---
name:            kernel
tracksRegLiveness: true
liveins:
  - { reg: '$x3', virtual-reg: '%8' }
  - { reg: '$x4', virtual-reg: '%9' }
  - { reg: '$x5', virtual-reg: '%10' }
body:             |
  bb.0.entry:
    successors: %bb.2(0x50000000), %bb.1(0x30000000)
    liveins: $x3, $x4, $x5
  
    %10:g8rc = COPY killed $x5
    %9:g8rc_and_g8rc_nox0 = COPY killed $x4
    %8:g8rc_and_g8rc_nox0 = COPY killed $x3
    %11:gprc = COPY killed %10.sub_32
    %13:crrc = CMPWI %11, 0
    BCC 44, killed %13, %bb.2
  
  bb.1:
    %12:vsfrc = XXLXORdpz
    B %bb.3
  
  bb.2.for.body.preheader:
    %0:vsfrc = DFLOADf64 0, %8 :: (load (s64) from %ir.a)
    %1:vsfrc = DFLOADf64 8, killed %8 :: (load (s64) from %ir.arrayidx1)
    %16:g8rc = IMPLICIT_DEF
    %15:g8rc = INSERT_SUBREG killed %16, killed %11, %subreg.sub_32
    %17:g8rc = RLDICL killed %15, 0, 32
    %2:g8rc = ADDI8 killed %9, -8
    MTCTR8loop killed %17, implicit-def dead $ctr8
    %14:vsfrc = XXLXORdpz
    B %bb.4
  
  bb.3.for.cond.cleanup:
    %3:vsfrc = PHI %12, %bb.1, %7, %bb.4
    $f1 = COPY killed %3
    BLR8 implicit $lr8, implicit $rm, implicit killed $f1
  
  bb.4.for.body:
    successors: %bb.4(0x7c000000), %bb.3(0x04000000)
  
    %4:vsfrc = PHI %14, %bb.2, %7, %bb.4
    %5:g8rc_and_g8rc_nox0 = PHI %2, %bb.2, %6, %bb.4
    %18:f8rc, %19:g8rc_and_g8rc_nox0 = LFDU 8, killed %5 :: (load (s64) from %ir.3)
    %6:g8rc = COPY killed %19
    %20:vsfrc = nofpexcept XSMADDADP %0, %0, %18, implicit $rm
    %21:vsfrc = nofpexcept XSMADDADP %20, %20, %18, implicit $rm
    %22:vsfrc = nofpexcept XSMADDADP %21, %21, %18, implicit $rm
    %23:vsfrc = nofpexcept XSMADDADP %22, %22, %18, implicit $rm
    %24:vsfrc = nofpexcept XSMADDADP %23, %23, %18, implicit $rm
    %25:vsfrc = nofpexcept XSMADDADP %24, %24, %18, implicit $rm
    %26:vsfrc = nofpexcept XSMADDADP %25, %25, %18, implicit $rm
    %27:vsfrc = nofpexcept XSMADDADP %26, %26, %18, implicit $rm
    %28:vsfrc = nofpexcept XSMADDADP %27, %27, %18, implicit $rm
    %29:vsfrc = nofpexcept XSMADDADP %28, %28, %18, implicit $rm
    %30:vsfrc = nofpexcept XSMADDADP %29, %29, %18, implicit $rm
    %31:vsfrc = nofpexcept XSMADDADP killed %30, %30, %18, implicit $rm
    %32:vsfrc = nofpexcept XSMADDADP %31, %31, %18, implicit $rm
    %33:vsfrc = nofpexcept XSMADDADP %32, %32, %18, implicit $rm
    %34:vsfrc = nofpexcept XSMADDADP %33, %33, %18, implicit $rm
    %35:vsfrc = nofpexcept XSMADDADP %34, %34, %18, implicit $rm
    %36:vsfrc = nofpexcept XSADDDP %34, %35, implicit $rm
    %37:vsfrc = nofpexcept XSMADDADP killed %36, %35, %18, implicit $rm
    %38:vsfrc = nofpexcept XSADDDP %27, %37, implicit $rm
    %39:vsfrc = nofpexcept XSMADDADP killed %38, %20, %18, implicit $rm
    %40:vsfrc = nofpexcept XSADDDP %28, %39, implicit $rm
    %41:vsfrc = nofpexcept XSMADDADP killed %40, %21, %18, implicit $rm
    %42:vsfrc = nofpexcept XSMULDP %18, killed %22, implicit $rm
    %43:vsfrc = nofpexcept XSMULDP killed %42, %29, implicit $rm
    %44:vsfrc = nofpexcept XSMADDADP %31, killed %43, killed %28, implicit $rm
    %45:vsfrc = nofpexcept XSMULDP killed %18, killed %24, implicit $rm
    %46:vsfrc = nofpexcept XSMULDP %1, killed %45, implicit $rm
    %47:vsfrc = nofpexcept XSMADDADP %44, killed %46, killed %26, implicit $rm
    %48:vsfrc = nofpexcept XSADDDP killed %20, killed %47, implicit $rm
    %49:vsfrc = nofpexcept XSADDDP %21, killed %48, implicit $rm
    %50:vsfrc = nofpexcept XSMULDP killed %29, killed %31, implicit $rm
    %51:vsfrc = nofpexcept XSMULDP killed %50, killed %32, implicit $rm
    %52:vsfrc = nofpexcept XSMULDP killed %51, killed %33, implicit $rm
    %53:vsfrc = nofpexcept XSMADDADP killed %49, killed %52, killed %34, implicit $rm
    %54:vsfrc = nofpexcept XSMADDADP %53, %25, %1, implicit $rm
    %55:vsfrc = nofpexcept XSMADDADP killed %54, killed %23, killed %21, implicit $rm
    %56:vsfrc = nofpexcept XSMULDP killed %35, killed %37, implicit $rm
    %57:vsfrc = nofpexcept XSMULDP killed %56, killed %39, implicit $rm
    %58:vsfrc = nofpexcept XSMADDADP killed %55, killed %57, killed %41, implicit $rm
    %59:vsfrc = nofpexcept XSMULDP killed %53, killed %58, implicit $rm
    %60:vsfrc = nofpexcept XSMULDP killed %44, killed %59, implicit $rm
    %61:vsfrc = nofpexcept XSMULDP killed %27, killed %60, implicit $rm
    %7:vsfrc = nofpexcept XSMADDADP killed %4, killed %61, killed %25, implicit $rm
    BDNZ8 %bb.4, implicit-def $ctr8, implicit $ctr8
    B %bb.3

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