[PowerPC] Prevent the use of MMA with P9 and earlier

[bsaleil]

Summary

We want to allow using MMA on P10 CPU only. This patch prevents the use of MMA with the -mmma option on P9 CPUs and earlier.

[bsaleil]

clang-format

[amyk]

Overall LGTM.

clang/lib/Basic/Targets/PPC.cpp

bool PPCTargetInfo::initFeatureMap(
 
   if (!(ArchDefs & ArchDefinePwr9) && (ArchDefs & ArchDefinePpcgr) &&
       llvm::find(FeaturesVec, "+float128") != FeaturesVec.end()) {
     // We have __float128 on PPC but not power 9 and above.
     Diags.Report(diag::err_opt_not_valid_with_opt) << "-mfloat128" << CPU;
     return false;
   }
 
+  if (!(ArchDefs & ArchDefinePwr10) && llvm::find(FeaturesVec, "+mma") != FeaturesVec.end()) {
+    // We have MMA on PPC but not power 10 and above.
+    Diags.Report(diag::err_opt_not_valid_with_opt) << "-mmma" << CPU;
+    return false;
+  }
+
   return TargetInfo::initFeatureMap(Features, Diags, CPU, FeaturesVec);
 }
 
 // Add any Power10 specific features.
 void PPCTargetInfo::addP10SpecificFeatures(
     llvm::StringMap<bool> &Features) const {
   Features["htm"] = false; // HTM was removed for P10.
   Features["paired-vector-memops"] = true;

clang/test/Driver/ppc-mma-support-check.c

+// RUN: not %clang -target powerpc64le-unknown-linux-gnu -fsyntax-only \
+// RUN:   -mcpu=pwr10 -mmma %s 2>&1 | FileCheck %s --check-prefix=HASMMA
+// RUN: not %clang -target powerpc64le-unknown-linux-gnu -fsyntax-only \
+// RUN:   -mcpu=power10 -mmma %s 2>&1 | FileCheck %s --check-prefix=HASMMA
+
+// RUN: not %clang -target powerpc64le-unknown-linux-gnu -fsyntax-only \
+// RUN:   -mcpu=pwr9 -mmma %s 2>&1 | FileCheck %s --check-prefix=NOMMA
+// RUN: not %clang -target powerpc64le-unknown-linux-gnu -fsyntax-only \
+// RUN:   -mcpu=pwr8 -mmma %s 2>&1 | FileCheck %s --check-prefix=NOMMA
+// RUN: not %clang -target powerpc64le-unknown-linux-gnu -fsyntax-only \
+// RUN:   -mcpu=pwr7 -mmma %s 2>&1 | FileCheck %s --check-prefix=NOMMA
+// RUN: not %clang -target powerpc64le-unknown-linux-gnu -fsyntax-only \
+// RUN:   -mmma %s 2>&1 | FileCheck %s --check-prefix=NOMMA
+
+#ifdef __MMA__
+static_assert(false, "MMA enabled");
+#endif
+
+// HASMMA: MMA enabled
+// HASMMA-NOT: option '-mmma' cannot be specified with
+// NOMMA: option '-mmma' cannot be specified with
+

clang/test/Preprocessor/init-ppc64.c

 // PPCFUTURE:#define _ARCH_PWR6 1
 // PPCFUTURE-NOT:#define _ARCH_PWR6X 1
 // PPCFUTURE:#define _ARCH_PWR7 1
 // PPCFUTURE:#define _ARCH_PWR8 1
 // PPCFUTURE:#define _ARCH_PWR9 1
 // PPCFUTURE:#define _ARCH_PWR_FUTURE 1
 // PPCFUTURE:#define __MMA__ 1
 //
-// RUN: %clang_cc1 -E -dM -ffreestanding -triple=powerpc64-none-none -target-feature +mma -target-cpu power9 -fno-signed-char < /dev/null | FileCheck -check-prefix PPC-MMA %s
+// RUN: %clang_cc1 -E -dM -ffreestanding -triple=powerpc64-none-none -target-feature +mma -target-cpu power10 -fno-signed-char < /dev/null | FileCheck -check-prefix PPC-MMA %s
 // PPC-MMA:#define __MMA__ 1
 //
 // RUN: %clang_cc1 -E -dM -ffreestanding -triple=powerpc64-none-none -target-feature +float128 -target-cpu power9 -fno-signed-char < /dev/null | FileCheck -check-prefix PPC-FLOAT128 %s
 // PPC-FLOAT128:#define __FLOAT128__ 1
 //
 // RUN: %clang_cc1 -E -dM -ffreestanding -triple=powerpc64-ibm-aix7.1.0.0 -fno-signed-char < /dev/null | FileCheck -match-full-lines -check-prefix PPC64-AIX %s
 //
 // PPC64-AIX:#define _AIX 1