[X86] Add skeleton support for "knm" cpu - clang side

[craig.topper]

Summary

This adds support Knights Mill CPU. Preprocessor defines match gcc's implementation.

[RKSimon]

LGTM

lib/Basic/Targets/X86.cpp

232

Worth adding a TODO comment for the missing features?

lib/Basic/Targets/X86.h

enum CPUKind {
     /// \name Cannonlake Client
     /// Cannonlake client microarchitecture based processors.
     CK_Cannonlake,
 
     /// \name Knights Landing
     /// Knights Landing processor.
     CK_KNL,
 
+    /// \name Knights Mill
+    /// Knights Mill processor.
+    CK_KNM,
+
     /// \name Lakemont
     /// Lakemont microarchitecture based processors.
     CK_Lakemont,
 
     /// \name K6
     /// K6 architecture processors.
     //@{
     CK_K6,
bool checkCPUKind(CPUKind Kind) const {
     case CK_SandyBridge:
     case CK_IvyBridge:
     case CK_Haswell:
     case CK_Broadwell:
     case CK_SkylakeClient:
     case CK_SkylakeServer:
     case CK_Cannonlake:
     case CK_KNL:
+    case CK_KNM:
     case CK_K8:
     case CK_K8SSE3:
     case CK_AMDFAM10:
     case CK_BTVER1:
     case CK_BTVER2:
     case CK_BDVER1:
     case CK_BDVER2:
     case CK_BDVER3:

lib/Basic/Targets/X86.cpp

case CK_Silvermont:
     LLVM_FALLTHROUGH;
   case CK_Bonnell:
     setFeatureEnabledImpl(Features, "movbe", true);
     setFeatureEnabledImpl(Features, "ssse3", true);
     setFeatureEnabledImpl(Features, "fxsr", true);
     setFeatureEnabledImpl(Features, "cx16", true);
     break;
 
+  case CK_KNM:
   case CK_KNL:
     setFeatureEnabledImpl(Features, "avx512f", true);
     setFeatureEnabledImpl(Features, "avx512cd", true);
     setFeatureEnabledImpl(Features, "avx512er", true);
     setFeatureEnabledImpl(Features, "avx512pf", true);
     setFeatureEnabledImpl(Features, "prefetchwt1", true);
     setFeatureEnabledImpl(Features, "fxsr", true);
     setFeatureEnabledImpl(Features, "rdseed", true);
void X86TargetInfo::getTargetDefines(const LangOptions &Opts,
   case CK_SkylakeServer:
     defineCPUMacros(Builder, "skx");
     break;
   case CK_Cannonlake:
     break;
   case CK_KNL:
     defineCPUMacros(Builder, "knl");
     break;
+  case CK_KNM:
+    defineCPUMacros(Builder, "knm");
+    break;
   case CK_Lakemont:
     Builder.defineMacro("__tune_lakemont__");
     break;
   case CK_K6_2:
     Builder.defineMacro("__k6_2__");
     Builder.defineMacro("__tune_k6_2__");
     LLVM_FALLTHROUGH;
   case CK_K6_3:
return llvm::StringSwitch<CPUKind>(CPU)
       .Cases("sandybridge", "corei7-avx", CK_SandyBridge)
       .Cases("ivybridge", "core-avx-i", CK_IvyBridge)
       .Cases("haswell", "core-avx2", CK_Haswell)
       .Case("broadwell", CK_Broadwell)
       .Case("skylake", CK_SkylakeClient)
       .Cases("skylake-avx512", "skx", CK_SkylakeServer)
       .Case("cannonlake", CK_Cannonlake)
       .Case("knl", CK_KNL)
+      .Case("knm", CK_KNM)
       .Case("lakemont", CK_Lakemont)
       .Case("k6", CK_K6)
       .Case("k6-2", CK_K6_2)
       .Case("k6-3", CK_K6_3)
       .Cases("athlon", "athlon-tbird", CK_Athlon)
       .Cases("athlon-xp", "athlon-mp", "athlon-4", CK_AthlonXP)
       .Cases("k8", "athlon64", "athlon-fx", "opteron", CK_K8)
       .Cases("k8-sse3", "athlon64-sse3", "opteron-sse3", CK_K8SSE3)

test/Driver/x86-march.c

 // RUN: %clang -target x86_64-unknown-unknown -c -### %s -march=skx 2>&1 \
 // RUN:   | FileCheck %s -check-prefix=skx
 // skx: "-target-cpu" "skx"
 //
 // RUN: %clang -target x86_64-unknown-unknown -c -### %s -march=knl 2>&1 \
 // RUN:   | FileCheck %s -check-prefix=knl
 // knl: "-target-cpu" "knl"
 //
+// RUN: %clang -target x86_64-unknown-unknown -c -### %s -march=knm 2>&1 \
+// RUN:   | FileCheck %s -check-prefix=knm
+// knm: "-target-cpu" "knm"
+//
 // RUN: %clang -target x86_64-unknown-unknown -c -### %s -march=cannonlake 2>&1 \
 // RUN:   | FileCheck %s -check-prefix=cannonlake
 // cannonlake: "-target-cpu" "cannonlake"
 //
 // RUN: %clang -target x86_64-unknown-unknown -c -### %s -march=lakemont 2>&1 \
 // RUN:   | FileCheck %s -check-prefix=lakemont
 // lakemont: "-target-cpu" "lakemont"
 //

test/Preprocessor/predefined-arch-macros.c

 // CHECK_KNL_M64: #define __XSAVE__ 1
 // CHECK_KNL_M64: #define __amd64 1
 // CHECK_KNL_M64: #define __amd64__ 1
 // CHECK_KNL_M64: #define __knl 1
 // CHECK_KNL_M64: #define __knl__ 1
 // CHECK_KNL_M64: #define __tune_knl__ 1
 // CHECK_KNL_M64: #define __x86_64 1
 // CHECK_KNL_M64: #define __x86_64__ 1
+
+// RUN: %clang -march=knm -m32 -E -dM %s -o - 2>&1 \
+// RUN:     -target i386-unknown-linux \
+// RUN:   | FileCheck -match-full-lines %s -check-prefix=CHECK_KNM_M32
+// CHECK_KNM_M32: #define __AES__ 1
+// CHECK_KNM_M32: #define __AVX2__ 1
+// CHECK_KNM_M32: #define __AVX512CD__ 1
+// CHECK_KNM_M32: #define __AVX512ER__ 1
+// CHECK_KNM_M32: #define __AVX512F__ 1
+// CHECK_KNM_M32: #define __AVX512PF__ 1
+// CHECK_KNM_M32: #define __AVX__ 1
+// CHECK_KNM_M32: #define __BMI2__ 1
+// CHECK_KNM_M32: #define __BMI__ 1
+// CHECK_KNM_M32: #define __F16C__ 1
+// CHECK_KNM_M32: #define __FMA__ 1
+// CHECK_KNM_M32: #define __LZCNT__ 1
+// CHECK_KNM_M32: #define __MMX__ 1
+// CHECK_KNM_M32: #define __PCLMUL__ 1
+// CHECK_KNM_M32: #define __POPCNT__ 1
+// CHECK_KNM_M32: #define __PREFETCHWT1__ 1
+// CHECK_KNM_M32: #define __RDRND__ 1
+// CHECK_KNM_M32: #define __RTM__ 1
+// CHECK_KNM_M32: #define __SSE2__ 1
+// CHECK_KNM_M32: #define __SSE3__ 1
+// CHECK_KNM_M32: #define __SSE4_1__ 1
+// CHECK_KNM_M32: #define __SSE4_2__ 1
+// CHECK_KNM_M32: #define __SSE__ 1
+// CHECK_KNM_M32: #define __SSSE3__ 1
+// CHECK_KNM_M32: #define __XSAVEOPT__ 1
+// CHECK_KNM_M32: #define __XSAVE__ 1
+// CHECK_KNM_M32: #define __i386 1
+// CHECK_KNM_M32: #define __i386__ 1
+// CHECK_KNM_M32: #define __knm 1
+// CHECK_KNM_M32: #define __knm__ 1
+// CHECK_KNM_M32: #define __tune_knm__ 1
+// CHECK_KNM_M32: #define i386 1
+
+// RUN: %clang -march=knm -m64 -E -dM %s -o - 2>&1 \
+// RUN:     -target i386-unknown-linux \
+// RUN:   | FileCheck -match-full-lines %s -check-prefix=CHECK_KNM_M64
+// CHECK_KNM_M64: #define __AES__ 1
+// CHECK_KNM_M64: #define __AVX2__ 1
+// CHECK_KNM_M64: #define __AVX512CD__ 1
+// CHECK_KNM_M64: #define __AVX512ER__ 1
+// CHECK_KNM_M64: #define __AVX512F__ 1
+// CHECK_KNM_M64: #define __AVX512PF__ 1
+// CHECK_KNM_M64: #define __AVX__ 1
+// CHECK_KNM_M64: #define __BMI2__ 1
+// CHECK_KNM_M64: #define __BMI__ 1
+// CHECK_KNM_M64: #define __F16C__ 1
+// CHECK_KNM_M64: #define __FMA__ 1
+// CHECK_KNM_M64: #define __LZCNT__ 1
+// CHECK_KNM_M64: #define __MMX__ 1
+// CHECK_KNM_M64: #define __PCLMUL__ 1
+// CHECK_KNM_M64: #define __POPCNT__ 1
+// CHECK_KNM_M64: #define __PREFETCHWT1__ 1
+// CHECK_KNM_M64: #define __RDRND__ 1
+// CHECK_KNM_M64: #define __RTM__ 1
+// CHECK_KNM_M64: #define __SSE2_MATH__ 1
+// CHECK_KNM_M64: #define __SSE2__ 1
+// CHECK_KNM_M64: #define __SSE3__ 1
+// CHECK_KNM_M64: #define __SSE4_1__ 1
+// CHECK_KNM_M64: #define __SSE4_2__ 1
+// CHECK_KNM_M64: #define __SSE_MATH__ 1
+// CHECK_KNM_M64: #define __SSE__ 1
+// CHECK_KNM_M64: #define __SSSE3__ 1
+// CHECK_KNM_M64: #define __XSAVEOPT__ 1
+// CHECK_KNM_M64: #define __XSAVE__ 1
+// CHECK_KNM_M64: #define __amd64 1
+// CHECK_KNM_M64: #define __amd64__ 1
+// CHECK_KNM_M64: #define __knm 1
+// CHECK_KNM_M64: #define __knm__ 1
+// CHECK_KNM_M64: #define __tune_knm__ 1
+// CHECK_KNM_M64: #define __x86_64 1
+// CHECK_KNM_M64: #define __x86_64__ 1
 //
 // RUN: %clang -march=skylake-avx512 -m32 -E -dM %s -o - 2>&1 \
 // RUN:     -target i386-unknown-linux \
 // RUN:   | FileCheck -match-full-lines %s -check-prefix=CHECK_SKX_M32
 // CHECK_SKX_M32: #define __AES__ 1
 // CHECK_SKX_M32: #define __AVX2__ 1
 // CHECK_SKX_M32: #define __AVX512BW__ 1
 // CHECK_SKX_M32: #define __AVX512CD__ 1