[PowerPC][MachinePipeliner] Enable pipeliner if hasInstrSchedModel

[jsji]

Summary

P9 is the only one with InstrSchedModel, but we may have more in the
future, we should not hardcoded it to P9, check hasInstrSchedModel
instead.

[hfinkel]

LGTM

llvm/lib/Target/PowerPC/PPCSubtarget.cpp

void PPCSubtarget::initSubtargetFeatures(StringRef CPU, StringRef FS) {
   // Determine endianness.
   // FIXME: Part of the TargetMachine.
   IsLittleEndian = (TargetTriple.getArch() == Triple::ppc64le);
 }
 
 bool PPCSubtarget::enableMachineScheduler() const { return true; }
 
 bool PPCSubtarget::enableMachinePipeliner() const {
-  return (CPUDirective == PPC::DIR_PWR9) && EnableMachinePipeliner;
+  return getSchedModel().hasInstrSchedModel() && EnableMachinePipeliner;
 }
 
 bool PPCSubtarget::useDFAforSMS() const { return false; }
 
 // This overrides the PostRAScheduler bit in the SchedModel for each CPU.
 bool PPCSubtarget::enablePostRAScheduler() const { return true; }
 
 PPCGenSubtargetInfo::AntiDepBreakMode PPCSubtarget::getAntiDepBreakMode() const {

llvm/test/CodeGen/PowerPC/sms-remark.ll

 ; RUN: llc < %s -ppc-vsr-nums-as-vr -mtriple=powerpc64-unknown-linux-gnu \
 ; RUN:       -verify-machineinstrs -ppc-asm-full-reg-names -mcpu=pwr9 --ppc-enable-pipeliner \
 ; RUN:       -pass-remarks-analysis=pipeliner -pass-remarks=pipeliner -o /dev/null 2>&1 \
-; RUN:       | FileCheck %s
+; RUN:       | FileCheck %s --check-prefix=ENABLED
+; RUN: llc < %s -ppc-vsr-nums-as-vr -mtriple=powerpc64-unknown-linux-gnu \
+; RUN:       -verify-machineinstrs -ppc-asm-full-reg-names -mcpu=pwr8 --ppc-enable-pipeliner \
+; RUN:       -pass-remarks-analysis=pipeliner -pass-remarks=pipeliner -o /dev/null 2>&1 \
+; RUN:       | FileCheck %s --allow-empty --check-prefix=DISABLED
 
 @x = dso_local local_unnamed_addr global <{ i32, i32, i32, i32, [1020 x i32] }> <{ i32 1, i32 2, i32 3, i32 4, [1020 x i32] zeroinitializer }>, align 4
 @y = dso_local global [1024 x i32] zeroinitializer, align 4
 
 define dso_local i32* @foo() local_unnamed_addr {
-;CHECK: Schedule found with Initiation Interval
-;CHECK: Pipelined succesfully!
+;ENABLED: Schedule found with Initiation Interval
+;ENABLED: Pipelined succesfully!
+;DISABLED-NOT: remark
 entry:
   %.pre = load i32, i32* getelementptr inbounds ([1024 x i32], [1024 x i32]* @y, i64 0, i64 0), align 4
   br label %for.body
 
 for.cond.cleanup:                                 ; preds = %for.body
   ret i32* getelementptr inbounds ([1024 x i32], [1024 x i32]* @y, i64 0, i64 0)
 
 for.body:                                         ; preds = %for.body, %entry