[X86] Introduction of -march=lakemont.

Differential Revision: http://reviews.llvm.org/D18651

llvm-svn: 265405

1 files changed, 16 insertions, 3 deletions

diff --git a/clang/lib/Basic/Targets.cpp b/clang/lib/Basic/Targets.cpp
index 70db97d7fb8..51ebd81871d 100644
--- a/clang/lib/Basic/Targets.cpp
+++ b/clang/lib/Basic/Targets.cpp
@@ -2239,6 +2239,10 @@ class X86TargetInfo : public TargetInfo {
     /// Knights Landing processor.
     CK_KNL,
 
+    /// \name Lakemont
+    /// Lakemont microarchitecture based processors.
+    CK_Lakemont,
+
     /// \name K6
     /// K6 architecture processors.
     //@{
@@ -2343,6 +2347,7 @@ class X86TargetInfo : public TargetInfo {
         .Case("skx", CK_SkylakeServer) // Legacy name.
         .Case("cannonlake", CK_Cannonlake)
         .Case("knl", CK_KNL)
+        .Case("lakemont", CK_Lakemont)
         .Case("k6", CK_K6)
         .Case("k6-2", CK_K6_2)
         .Case("k6-3", CK_K6_3)
@@ -2490,6 +2495,7 @@ public:
     case CK_C3_2:
     case CK_Pentium4:
     case CK_Pentium4M:
+    case CK_Lakemont:
     case CK_Prescott:
     case CK_K6:
     case CK_K6_2:
@@ -2588,10 +2594,13 @@ bool X86TargetInfo::initFeatureMap(
   if (getTriple().getArch() == llvm::Triple::x86_64)
     setFeatureEnabledImpl(Features, "sse2", true);
 
-  // Enable X87 for all X86 processors.
-  setFeatureEnabledImpl(Features, "x87", true);
+  const CPUKind Kind = getCPUKind(CPU);
+
+  // Enable X87 for all X86 processors but Lakemont.
+  if (Kind != CK_Lakemont)
+    setFeatureEnabledImpl(Features, "x87", true);
 
-  switch (getCPUKind(CPU)) {
+  switch (Kind) {
   case CK_Generic:
   case CK_i386:
   case CK_i486:
@@ -2599,6 +2608,7 @@ bool X86TargetInfo::initFeatureMap(
   case CK_Pentium:
   case CK_i686:
   case CK_PentiumPro:
+  case CK_Lakemont:
     break;
   case CK_PentiumMMX:
   case CK_Pentium2:
@@ -3253,6 +3263,9 @@ void X86TargetInfo::getTargetDefines(const LangOptions &Opts,
   case CK_KNL:
     defineCPUMacros(Builder, "knl");
     break;
+  case CK_Lakemont:
+    Builder.defineMacro("__tune_lakemont__");
+    break;
   case CK_K6_2:
     Builder.defineMacro("__k6_2__");
     Builder.defineMacro("__tune_k6_2__");