Adds support for Atom Silvermont (SLM) - -march=slm

Implements Instruction scheduler latencies for Silvermont,
using latencies from the Intel Silvermont Optimization Guide.

Auto detects SLM.

Turns on post RA scheduler when generating code for SLM.




git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@190717 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 6 insertions, 2 deletions

diff --git a/lib/Target/X86/X86Subtarget.cpp b/lib/Target/X86/X86Subtarget.cpp
index 851ab63..78c9a1a 100644
--- a/lib/Target/X86/X86Subtarget.cpp
+++ b/lib/Target/X86/X86Subtarget.cpp
@@ -281,7 +281,7 @@ void X86Subtarget::AutoDetectSubtargetFeatures() {
       ToggleFeature(X86::FeatureFastUAMem);
     }
 
-    // Set processor type. Currently only Atom is detected.
+    // Set processor type. Currently only Atom or Silvermont (SLM) is detected.
     if (Family == 6 &&
         (Model == 28 || Model == 38 || Model == 39 ||
          Model == 53 || Model == 54)) {
@@ -290,6 +290,10 @@ void X86Subtarget::AutoDetectSubtargetFeatures() {
       UseLeaForSP = true;
       ToggleFeature(X86::FeatureLeaForSP);
     }
+    else if (Family == 6 &&
+        (Model == 55 || Model == 74 || Model == 77)) {
+      X86ProcFamily = IntelSLM;
+    }
 
     unsigned MaxExtLevel;
     X86_MC::GetCpuIDAndInfo(0x80000000, &MaxExtLevel, &EBX, &ECX, &EDX);
@@ -451,7 +455,7 @@ void X86Subtarget::resetSubtargetFeatures(StringRef CPU, StringRef FS) {
   // new MCSchedModel is used.
   InitMCProcessorInfo(CPUName, FS);
 
-  if (X86ProcFamily == IntelAtom)
+  if (X86ProcFamily == IntelAtom || X86ProcFamily == IntelSLM)
     PostRAScheduler = true;
 
   InstrItins = getInstrItineraryForCPU(CPUName);