[PowerPC] Add options to control paired vector memops support

Adds frontend and backend options to enable and disable the
PowerPC paired vector memory operations added in ISA 3.1.
Instructions using these options will be added in subsequent patches.

Differential Revision: https://reviews.llvm.org/D83722

clang/include/clang/Driver/Options.td

@@ -2453,6 +2453,10 @@ def mdirect_move : Flag<["-"], "mdirect-move">,
     Group<m_ppc_Features_Group>;
 def mnodirect_move : Flag<["-"], "mno-direct-move">,
     Group<m_ppc_Features_Group>;
+def mpaired_vector_memops: Flag<["-"], "mpaired-vector-memops">,
+    Group<m_ppc_Features_Group>;
+def mnopaired_vector_memops: Flag<["-"], "mno-paired-vector-memops">,
+    Group<m_ppc_Features_Group>;
 def mhtm : Flag<["-"], "mhtm">, Group<m_ppc_Features_Group>;
 def mno_htm : Flag<["-"], "mno-htm">, Group<m_ppc_Features_Group>;
 def mfprnd : Flag<["-"], "mfprnd">, Group<m_ppc_Features_Group>;

clang/lib/Basic/Targets/PPC.cpp

@@ -62,6 +62,8 @@ bool PPCTargetInfo::handleTargetFeatures(std::vector<std::string> &Features,
       LongDoubleFormat = &llvm::APFloat::IEEEdouble();
     } else if (Feature == "-hard-float") {
       FloatABI = SoftFloat;
+    } else if (Feature == "+paired-vector-memops") {
+      PairedVectorMemops = true;
     }
     // TODO: Finish this list and add an assert that we've handled them
     // all.
@@ -218,6 +220,7 @@ void PPCTargetInfo::getTargetDefines(const LangOptions &Opts,
 // - direct-move
 // - float128
 // - power9-vector
+// - paired-vector-memops
 // - power10-vector
 // then go ahead and error since the customer has expressed an incompatible
 // set of options.
@@ -240,6 +243,7 @@ static bool ppcUserFeaturesCheck(DiagnosticsEngine &Diags,
   Found |= FindVSXSubfeature("+direct-move", "-mdirect-move");
   Found |= FindVSXSubfeature("+float128", "-mfloat128");
   Found |= FindVSXSubfeature("+power9-vector", "-mpower9-vector");
+  Found |= FindVSXSubfeature("+paired-vector-memops", "-mpaired-vector-memops");
   Found |= FindVSXSubfeature("+power10-vector", "-mpower10-vector");
 
   // Return false if any vsx subfeatures was found.
@@ -340,6 +344,7 @@ bool PPCTargetInfo::initFeatureMap(
 void PPCTargetInfo::addP10SpecificFeatures(
     llvm::StringMap<bool> &Features) const {
   Features["htm"] = false; // HTM was removed for P10.
+  Features["paired-vector-memops"] = true;
   Features["power10-vector"] = true;
   Features["pcrelative-memops"] = true;
   return;
@@ -364,6 +369,7 @@ bool PPCTargetInfo::hasFeature(StringRef Feature) const {
       .Case("extdiv", HasExtDiv)
       .Case("float128", HasFloat128)
       .Case("power9-vector", HasP9Vector)
+      .Case("paired-vector-memops", PairedVectorMemops)
       .Case("power10-vector", HasP10Vector)
       .Case("pcrelative-memops", HasPCRelativeMemops)
       .Case("spe", HasSPE)
@@ -380,6 +386,7 @@ void PPCTargetInfo::setFeatureEnabled(llvm::StringMap<bool> &Features,
                              .Case("direct-move", true)
                              .Case("power8-vector", true)
                              .Case("power9-vector", true)
+                             .Case("paired-vector-memops", true)
                              .Case("power10-vector", true)
                              .Case("float128", true)
                              .Default(false);
@@ -399,11 +406,13 @@ void PPCTargetInfo::setFeatureEnabled(llvm::StringMap<bool> &Features,
     if ((Name == "altivec") || (Name == "vsx"))
       Features["vsx"] = Features["direct-move"] = Features["power8-vector"] =
           Features["float128"] = Features["power9-vector"] =
-              Features["power10-vector"] = false;
+              Features["paired-vector-memops"] = Features["power10-vector"] =
+                  false;
     if (Name == "power8-vector")
-      Features["power9-vector"] = Features["power10-vector"] = false;
+      Features["power9-vector"] = Features["paired-vector-memops"] =
+          Features["power10-vector"] = false;
     else if (Name == "power9-vector")
-      Features["power10-vector"] = false;
+      Features["paired-vector-memops"] = Features["power10-vector"] = false;
     if (Name == "pcrel")
       Features["pcrelative-memops"] = false;
     else

clang/lib/Basic/Targets/PPC.h

@@ -67,6 +67,7 @@ class LLVM_LIBRARY_VISIBILITY PPCTargetInfo : public TargetInfo {
   bool HasExtDiv = false;
   bool HasP9Vector = false;
   bool HasSPE = false;
+  bool PairedVectorMemops = false;
   bool HasP10Vector = false;
   bool HasPCRelativeMemops = false;
 

clang/test/Driver/ppc-dependent-options.cpp

@@ -54,6 +54,10 @@
 // RUN: -mcpu=power9 -std=c++11 -mno-vsx -mfloat128 %s 2>&1 | \
 // RUN: FileCheck %s -check-prefix=CHECK-NVSX-FLT128
 
+// RUN: not %clang -target powerpc64le-unknown-unknown -fsyntax-only \
+// RUN: -mcpu=power10 -std=c++11 -mno-vsx -mpaired-vector-memops %s 2>&1 | \
+// RUN: FileCheck %s -check-prefix=CHECK-NVSX-PAIRED-VEC-MEMOPS
+
 // RUN: not %clang -target powerpc64le-unknown-unknown -fsyntax-only \
 // RUN: -mcpu=power9 -std=c++11 -mno-vsx -mfloat128 -mpower9-vector %s 2>&1 | \
 // RUN: FileCheck %s -check-prefix=CHECK-NVSX-MULTI
@@ -96,6 +100,7 @@ static_assert(false, "Neither enabled");
 // CHECK-NVSX-P10V: error: option '-mpower10-vector' cannot be specified with '-mno-vsx'
 // CHECK-NVSX-FLT128: error: option '-mfloat128' cannot be specified with '-mno-vsx'
 // CHECK-NVSX-DMV: error: option '-mdirect-move' cannot be specified with '-mno-vsx'
+// CHECK-NVSX-PAIRED-VEC-MEMOPS: error: option '-mpaired-vector-memops' cannot be specified with '-mno-vsx'
 // CHECK-NVSX-MULTI: error: option '-mfloat128' cannot be specified with '-mno-vsx'
 // CHECK-NVSX-MULTI: error: option '-mpower9-vector' cannot be specified with '-mno-vsx'
 // CHECK-NVSX: Neither enabled

llvm/lib/Target/PowerPC/PPC.td

@@ -234,6 +234,10 @@ def FeaturePCRelativeMemops :
   SubtargetFeature<"pcrelative-memops", "HasPCRelativeMemops", "true",
                    "Enable PC relative Memory Ops",
                    [FeatureISA3_0]>;
+def FeaturePairedVectorMemops:
+  SubtargetFeature<"paired-vector-memops", "PairedVectorMemops", "true",
+                   "32Byte load and store instructions",
+                   [FeatureISA3_0]>;
 
 def FeaturePredictableSelectIsExpensive :
   SubtargetFeature<"predictable-select-expensive",
@@ -339,7 +343,7 @@ def ProcessorFeatures {
   // still exist with the exception of those we know are Power9 specific.
   list<SubtargetFeature> P10AdditionalFeatures =
     [DirectivePwr10, FeatureISA3_1, FeaturePrefixInstrs,
-     FeaturePCRelativeMemops, FeatureP10Vector];
+     FeaturePCRelativeMemops, FeatureP10Vector, FeaturePairedVectorMemops];
   list<SubtargetFeature> P10SpecificFeatures = [];
   list<SubtargetFeature> P10InheritableFeatures =
     !listconcat(P9InheritableFeatures, P10AdditionalFeatures);

llvm/lib/Target/PowerPC/PPCInstrPrefix.td

@@ -454,6 +454,7 @@ multiclass 8LS_DForm_R_SI34_XT6_RA5_p<bits<5> opcode, dag OOL, dag IOL,
 
 def PrefixInstrs : Predicate<"Subtarget->hasPrefixInstrs()">;
 def IsISA3_1 : Predicate<"Subtarget->isISA3_1()">;
+def PairedVectorMemops : Predicate<"PPCSubTarget->pairedVectorMemops()">;
 
 let Predicates = [PrefixInstrs] in {
   let Interpretation64Bit = 1, isCodeGenOnly = 1 in {

llvm/lib/Target/PowerPC/PPCScheduleP9.td

@@ -41,8 +41,10 @@ def P9Model : SchedMachineModel {
   let CompleteModel = 1;
 
   // Do not support SPE (Signal Processing Engine), prefixed instructions on
-  // Power 9, PC relative mem ops, or instructions introduced in ISA 3.1.
-  let UnsupportedFeatures = [HasSPE, PrefixInstrs, PCRelativeMemops, IsISA3_1];
+  // Power 9, paired vector mem ops, PC relative mem ops, or instructions
+  // introduced in ISA 3.1.
+  let UnsupportedFeatures = [HasSPE, PrefixInstrs, PairedVectorMemops,
+                             PCRelativeMemops, IsISA3_1];
 }
 
 let SchedModel = P9Model in {

llvm/lib/Target/PowerPC/PPCSubtarget.cpp

@@ -116,6 +116,7 @@ void PPCSubtarget::initializeEnvironment() {
   VectorsUseTwoUnits = false;
   UsePPCPreRASchedStrategy = false;
   UsePPCPostRASchedStrategy = false;
+  PairedVectorMemops = false;
   PredictableSelectIsExpensive = false;
 
   HasPOPCNTD = POPCNTD_Unavailable;

llvm/lib/Target/PowerPC/PPCSubtarget.h

@@ -145,6 +145,7 @@ protected:
   bool VectorsUseTwoUnits;
   bool UsePPCPreRASchedStrategy;
   bool UsePPCPostRASchedStrategy;
+  bool PairedVectorMemops;
   bool PredictableSelectIsExpensive;
 
   POPCNTDKind HasPOPCNTD;
@@ -259,6 +260,7 @@ public:
   bool hasP10Vector() const { return HasP10Vector; }
   bool hasPrefixInstrs() const { return HasPrefixInstrs; }
   bool hasPCRelativeMemops() const { return HasPCRelativeMemops; }
+  bool pairedVectorMemops() const { return PairedVectorMemops; }
   bool hasMFOCRF() const { return HasMFOCRF; }
   bool hasISEL() const { return HasISEL; }
   bool hasBPERMD() const { return HasBPERMD; }

llvm/test/CodeGen/PowerPC/future-check-features.ll

@@ -1,9 +1,9 @@
-; RUN: llc -mattr=pcrelative-memops,prefix-instrs -verify-machineinstrs \
-; RUN:   -mtriple=powerpc64le-unknown-unknown -ppc-asm-full-reg-names \
-; RUN:   %s -o - 2>&1 | FileCheck %s
-; RUN: llc -mattr=pcrelative-memops,prefix-instrs -verify-machineinstrs \
-; RUN:   -mtriple=powerpc64-unknown-unknown -ppc-asm-full-reg-names \
-; RUN:   %s -o - 2>&1 | FileCheck %s
+; RUN: llc -mattr=pcrelative-memops,prefix-instrs,paired-vector-memops \
+; RUN:   -verify-machineinstrs -mtriple=powerpc64le-unknown-unknown \
+; RUN:   -ppc-asm-full-reg-names %s -o - 2>&1 | FileCheck %s
+; RUN: llc -mattr=pcrelative-memops,prefix-instrs,paired-vector-memops \
+; RUN:   -verify-machineinstrs -mtriple=powerpc64-unknown-unknown \
+; RUN:   -ppc-asm-full-reg-names %s -o - 2>&1 | FileCheck %s
 
 define dso_local signext i32 @f() {
 entry: