[MSP430] Add subtarget features for hardware multiplier.

Also add more processors to make -mcpu option behave similar to gcc.

Differential Revision: https://reviews.llvm.org/D33335

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@303695 91177308-0d34-0410-b5e6-96231b3b80d8

Author: pftbest

lib/Target/MSP430/MSP430.td

@@ -22,13 +22,27 @@ def FeatureX
  : SubtargetFeature<"ext", "ExtendedInsts", "true",
                     "Enable MSP430-X extensions">;
 
+def FeatureHWMult16
+ : SubtargetFeature<"hwmult16", "HWMultMode", "HWMult16",
+                    "Enable 16-bit hardware multiplier">;
+
+def FeatureHWMult32
+ : SubtargetFeature<"hwmult32", "HWMultMode", "HWMult32",
+                    "Enable 32-bit hardware multiplier">;
+
+def FeatureHWMultF5
+ : SubtargetFeature<"hwmultf5", "HWMultMode", "HWMultF5",
+                    "Enable F5 series hardware multiplier">;
+
 //===----------------------------------------------------------------------===//
 // MSP430 supported processors.
 //===----------------------------------------------------------------------===//
 class Proc<string Name, list<SubtargetFeature> Features>
  : Processor<Name, NoItineraries, Features>;
 
 def : Proc<"generic",         []>;
+def : Proc<"msp430",          []>;
+def : Proc<"msp430x",         [FeatureX]>;
 
 //===----------------------------------------------------------------------===//
 // Register File Description

lib/Target/MSP430/MSP430ISelLowering.cpp

@@ -38,27 +38,6 @@ using namespace llvm;
 
 #define DEBUG_TYPE "msp430-lower"
 
-typedef enum {
-  NoHWMult,
-  HWMult16,
-  HWMult32,
-  HWMultF5
-} HWMultUseMode;
-
-static cl::opt<HWMultUseMode>
-HWMultMode("mhwmult", cl::Hidden,
-           cl::desc("Hardware multiplier use mode"),
-           cl::init(NoHWMult),
-           cl::values(
-             clEnumValN(NoHWMult, "none",
-                "Do not use hardware multiplier"),
-             clEnumValN(HWMult16, "16bit",
-                "Use 16-bit hardware multiplier"),
-             clEnumValN(HWMult32, "32bit",
-                "Use 32-bit hardware multiplier"),
-             clEnumValN(HWMultF5, "f5series",
-                "Use F5 series hardware multiplier")));
-
 MSP430TargetLowering::MSP430TargetLowering(const TargetMachine &TM,
                                            const MSP430Subtarget &STI)
     : TargetLowering(TM) {
@@ -262,7 +241,7 @@ MSP430TargetLowering::MSP430TargetLowering(const TargetMachine &TM,
       setCmpLibcallCC(LC.Op, LC.Cond);
   }
 
-  if (HWMultMode == HWMult16) {
+  if (STI.hasHWMult16()) {
     const struct {
       const RTLIB::Libcall Op;
       const char * const Name;
@@ -277,7 +256,7 @@ MSP430TargetLowering::MSP430TargetLowering(const TargetMachine &TM,
     for (const auto &LC : LibraryCalls) {
       setLibcallName(LC.Op, LC.Name);
     }
-  } else if (HWMultMode == HWMult32) {
+  } else if (STI.hasHWMult32()) {
     const struct {
       const RTLIB::Libcall Op;
       const char * const Name;
@@ -292,7 +271,7 @@ MSP430TargetLowering::MSP430TargetLowering(const TargetMachine &TM,
     for (const auto &LC : LibraryCalls) {
       setLibcallName(LC.Op, LC.Name);
     }
-  } else if (HWMultMode == HWMultF5) {
+  } else if (STI.hasHWMultF5()) {
     const struct {
       const RTLIB::Libcall Op;
       const char * const Name;

lib/Target/MSP430/MSP430Subtarget.cpp

@@ -19,6 +19,20 @@ using namespace llvm;
 
 #define DEBUG_TYPE "msp430-subtarget"
 
+static cl::opt<MSP430Subtarget::HWMultEnum>
+HWMultModeOption("mhwmult", cl::Hidden,
+           cl::desc("Hardware multiplier use mode for MSP430"),
+           cl::init(MSP430Subtarget::NoHWMult),
+           cl::values(
+             clEnumValN(MSP430Subtarget::NoHWMult, "none",
+                "Do not use hardware multiplier"),
+             clEnumValN(MSP430Subtarget::HWMult16, "16bit",
+                "Use 16-bit hardware multiplier"),
+             clEnumValN(MSP430Subtarget::HWMult32, "32bit",
+                "Use 32-bit hardware multiplier"),
+             clEnumValN(MSP430Subtarget::HWMultF5, "f5series",
+                "Use F5 series hardware multiplier")));
+
 #define GET_SUBTARGETINFO_TARGET_DESC
 #define GET_SUBTARGETINFO_CTOR
 #include "MSP430GenSubtargetInfo.inc"
@@ -27,7 +41,18 @@ void MSP430Subtarget::anchor() { }
 
 MSP430Subtarget &
 MSP430Subtarget::initializeSubtargetDependencies(StringRef CPU, StringRef FS) {
-  ParseSubtargetFeatures("generic", FS);
+  ExtendedInsts = false;
+  HWMultMode = NoHWMult;
+
+  std::string CPUName = CPU;
+  if (CPUName.empty())
+    CPUName = "msp430";
+
+  ParseSubtargetFeatures(CPUName, FS);
+
+  if (HWMultModeOption != NoHWMult)
+    HWMultMode = HWMultModeOption;
+
   return *this;
 }
 

lib/Target/MSP430/MSP430Subtarget.h

@@ -30,8 +30,15 @@ namespace llvm {
 class StringRef;
 
 class MSP430Subtarget : public MSP430GenSubtargetInfo {
+public:
+  enum HWMultEnum {
+    NoHWMult, HWMult16, HWMult32, HWMultF5
+  };
+
+private:
   virtual void anchor();
   bool ExtendedInsts;
+  HWMultEnum HWMultMode;
   MSP430FrameLowering FrameLowering;
   MSP430InstrInfo InstrInfo;
   MSP430TargetLowering TLInfo;
@@ -50,6 +57,10 @@ class MSP430Subtarget : public MSP430GenSubtargetInfo {
   /// subtarget options.  Definition of function is auto generated by tblgen.
   void ParseSubtargetFeatures(StringRef CPU, StringRef FS);
 
+  bool hasHWMult16() const { return HWMultMode == HWMult16; }
+  bool hasHWMult32() const { return HWMultMode == HWMult32; }
+  bool hasHWMultF5() const { return HWMultMode == HWMultF5; }
+
   const TargetFrameLowering *getFrameLowering() const override {
     return &FrameLowering;
   }

test/CodeGen/MSP430/hwmult16.ll

@@ -1,4 +1,5 @@
 ; RUN: llc -O0 -mhwmult=16bit < %s | FileCheck %s
+; RUN: llc -O0 -mattr=+hwmult16 < %s | FileCheck %s
 
 target datalayout = "e-p:16:16:16-i8:8:8-i16:16:16-i32:16:32-n8:16-a0:16:16"
 target triple = "msp430---elf"

test/CodeGen/MSP430/hwmult32.ll

@@ -1,4 +1,5 @@
 ; RUN: llc -O0 -mhwmult=32bit < %s | FileCheck %s
+; RUN: llc -O0 -mattr=+hwmult32 < %s | FileCheck %s
 
 target datalayout = "e-p:16:16:16-i8:8:8-i16:16:16-i32:16:32-n8:16-a0:16:16"
 target triple = "msp430---elf"

test/CodeGen/MSP430/hwmultf5.ll

@@ -1,4 +1,5 @@
 ; RUN: llc -O0 -mhwmult=f5series < %s | FileCheck %s
+; RUN: llc -O0 -mattr=+hwmultf5 < %s | FileCheck %s
 
 target datalayout = "e-p:16:16:16-i8:8:8-i16:16:16-i32:16:32-n8:16-a0:16:16"
 target triple = "msp430---elf"