[RISCV] Replace uses of hasStdExtC with COrZca.

Except MakeCompressible which will need more work.

Reviewed By: reames

Differential Revision: https://reviews.llvm.org/D139504

Author: topperc

llvm/lib/Target/RISCV/MCTargetDesc/RISCVMatInt.cpp

@@ -366,7 +366,8 @@ InstSeq generateInstSeq(int64_t Val, const FeatureBitset &ActiveFeatures) {
 int getIntMatCost(const APInt &Val, unsigned Size,
                   const FeatureBitset &ActiveFeatures, bool CompressionCost) {
   bool IsRV64 = ActiveFeatures[RISCV::Feature64Bit];
-  bool HasRVC = CompressionCost && ActiveFeatures[RISCV::FeatureStdExtC];
+  bool HasRVC = CompressionCost && (ActiveFeatures[RISCV::FeatureStdExtC] ||
+                                    ActiveFeatures[RISCV::FeatureExtZca]);
   int PlatRegSize = IsRV64 ? 64 : 32;
 
   // Split the constant into platform register sized chunks, and calculate cost

llvm/lib/Target/RISCV/RISCVMakeCompressible.cpp

@@ -332,6 +332,7 @@ bool RISCVMakeCompressibleOpt::runOnMachineFunction(MachineFunction &Fn) {
   const RISCVInstrInfo &TII = *STI.getInstrInfo();
 
   // This optimization only makes sense if compressed instructions are emitted.
+  // FIXME: Support Zca, Zcf, Zcd granularity.
   if (!STI.hasStdExtC())
     return false;
 

llvm/lib/Target/RISCV/RISCVRegisterInfo.cpp

@@ -562,7 +562,7 @@ void RISCVRegisterInfo::getOffsetOpcodes(const StackOffset &Offset,
 
 unsigned
 RISCVRegisterInfo::getRegisterCostTableIndex(const MachineFunction &MF) const {
-  return MF.getSubtarget<RISCVSubtarget>().hasStdExtC() ? 1 : 0;
+  return MF.getSubtarget<RISCVSubtarget>().hasStdExtCOrZca() ? 1 : 0;
 }
 
 // Add two address hints to improve chances of being able to use a compressed

llvm/test/CodeGen/RISCV/add-before-shl.ll

@@ -7,6 +7,10 @@
 ; RUN:   < %s | FileCheck -check-prefixes=RV32C %s
 ; RUN: llc -mtriple=riscv64 -mattr=+c -verify-machineinstrs --riscv-no-aliases \
 ; RUN:   < %s | FileCheck -check-prefixes=RV64C %s
+; RUN: llc -mtriple=riscv32 -mattr=+experimental-zca -verify-machineinstrs --riscv-no-aliases \
+; RUN:   < %s | FileCheck -check-prefixes=RV32C %s
+; RUN: llc -mtriple=riscv64 -mattr=+experimental-zca -verify-machineinstrs --riscv-no-aliases \
+; RUN:   < %s | FileCheck -check-prefixes=RV64C %s
 
 ; These test that constant adds are not moved after shifts by DAGCombine,
 ; if the constant is cheaper to materialise before it has been shifted.