[PowerPC]: Add powerpcspe target triple subarch component

Summary:
This allows the use of '-target powerpcspe-unknown-linux-gnu' or
'powerpcspe-unknown-freebsd' to be used, instead of
'-target powerpc-unknown-linux-gnu -mspe'.

Reviewed By: dim
Differential Revision: https://reviews.llvm.org/D72014

clang/lib/Basic/Targets/PPC.cpp

@@ -316,7 +316,8 @@ bool PPCTargetInfo::initFeatureMap(
                         .Case("pwr8", true)
                         .Default(false);
 
-  Features["spe"] = llvm::StringSwitch<bool>(CPU)
+  Features["spe"] = getTriple().getSubArch() == llvm::Triple::PPCSubArch_spe ||
+                    llvm::StringSwitch<bool>(CPU)
                         .Case("8548", true)
                         .Case("e500", true)
                         .Default(false);

clang/lib/Basic/Targets/PPC.h

@@ -87,8 +87,7 @@ public:
 
   // Note: GCC recognizes the following additional cpus:
   //  401, 403, 405, 405fp, 440fp, 464, 464fp, 476, 476fp, 505, 740, 801,
-  //  821, 823, 8540, 8548, e300c2, e300c3, e500mc64, e6500, 860, cell,
-  //  titan, rs64.
+  //  821, 823, 8540, e300c2, e300c3, e500mc64, e6500, 860, cell, titan, rs64.
   bool isValidCPUName(StringRef Name) const override;
   void fillValidCPUList(SmallVectorImpl<StringRef> &Values) const override;
 

clang/test/Preprocessor/init.c

@@ -6551,10 +6551,11 @@
 // PPC32-LINUX-NOT: _CALL_LINUX
 //
 // RUN: %clang_cc1 -E -dM -ffreestanding -triple=powerpc-unknown-linux-gnu -target-feature +spe < /dev/null | FileCheck -match-full-lines -check-prefix PPC32-SPE %s
+// RUN: %clang_cc1 -E -dM -ffreestanding -triple=powerpcspe-unknown-linux-gnu < /dev/null | FileCheck -match-full-lines -check-prefix PPC32-SPE %s
 //
 // PPC32-SPE:#define __NO_FPRS__ 1
 // PPC32-SPE:#define __SPE__ 1
-// 
+//
 // RUN: %clang_cc1 -E -dM -ffreestanding -triple=powerpc-unknown-linux-gnu -target-cpu 8548 < /dev/null | FileCheck -match-full-lines -check-prefix PPC8548 %s
 //
 // PPC8548:#define __NO_FPRS__ 1

llvm/include/llvm/ADT/Triple.h

@@ -128,7 +128,9 @@ public:
     KalimbaSubArch_v4,
     KalimbaSubArch_v5,
 
-    MipsSubArch_r6
+    MipsSubArch_r6,
+
+    PPCSubArch_spe
   };
   enum VendorType {
     UnknownVendor,

llvm/lib/Support/Triple.cpp

@@ -387,7 +387,7 @@ static Triple::ArchType parseArch(StringRef ArchName) {
     // FIXME: Do we need to support these?
     .Cases("i786", "i886", "i986", Triple::x86)
     .Cases("amd64", "x86_64", "x86_64h", Triple::x86_64)
-    .Cases("powerpc", "ppc", "ppc32", Triple::ppc)
+    .Cases("powerpc", "powerpcspe", "ppc", "ppc32", Triple::ppc)
     .Cases("powerpc64", "ppu", "ppc64", Triple::ppc64)
     .Cases("powerpc64le", "ppc64le", Triple::ppc64le)
     .Case("xscale", Triple::arm)
@@ -559,6 +559,9 @@ static Triple::SubArchType parseSubArch(StringRef SubArchName) {
       (SubArchName.endswith("r6el") || SubArchName.endswith("r6")))
     return Triple::MipsSubArch_r6;
 
+  if (SubArchName == "powerpcspe")
+    return Triple::PPCSubArch_spe;
+
   StringRef ARMSubArch = ARM::getCanonicalArchName(SubArchName);
 
   // For now, this is the small part. Early return.

llvm/lib/Target/PowerPC/PPCSubtarget.cpp

@@ -151,6 +151,9 @@ void PPCSubtarget::initSubtargetFeatures(StringRef CPU, StringRef FS) {
       TargetTriple.isMusl())
     SecurePlt = true;
 
+  if (TargetTriple.getSubArch() == Triple::PPCSubArch_spe)
+    HasSPE = true;
+
   if (HasSPE && IsPPC64)
     report_fatal_error( "SPE is only supported for 32-bit targets.\n", false);
   if (HasSPE && (HasAltivec || HasQPX || HasVSX || HasFPU))

llvm/unittests/ADT/TripleTest.cpp

@@ -163,6 +163,13 @@ TEST(TripleTest, ParsedIDs) {
   EXPECT_EQ(Triple::UnknownOS, T.getOS());
   EXPECT_EQ(Triple::UnknownEnvironment, T.getEnvironment());
 
+  T = Triple("powerpcspe-unknown-freebsd");
+  EXPECT_EQ(Triple::ppc, T.getArch());
+  EXPECT_EQ(Triple::PPCSubArch_spe, T.getSubArch());
+  EXPECT_EQ(Triple::UnknownVendor, T.getVendor());
+  EXPECT_EQ(Triple::FreeBSD, T.getOS());
+  EXPECT_EQ(Triple::UnknownEnvironment, T.getEnvironment());
+
   T = Triple("arm-none-none-eabi");
   EXPECT_EQ(Triple::arm, T.getArch());
   EXPECT_EQ(Triple::UnknownVendor, T.getVendor());