[X86] Move all atom CPUs to the same section of the switch and use fallthroughs like we do for other CPU generations. NFC

This is prep work to add MOVBE to all Atom CPUs. This instruction didn't come in to the Nehalem/Westmere/SandyBridge/etc. line until later so there's no natural place to overlap the Atom CPUs into that part of the switch.

llvm-svn: 306849

1 files changed, 6 insertions, 3 deletions

diff --git a/clang/lib/Basic/Targets.cpp b/clang/lib/Basic/Targets.cpp
index e1d1bf3ad17..c8326ab2736 100644
--- a/clang/lib/Basic/Targets.cpp
+++ b/clang/lib/Basic/Targets.cpp
@@ -3224,7 +3224,6 @@ bool X86TargetInfo::initFeatureMap(
     setFeatureEnabledImpl(Features, "cx16", true);
     break;
   case CK_Core2:
-  case CK_Bonnell:
     setFeatureEnabledImpl(Features, "ssse3", true);
     setFeatureEnabledImpl(Features, "fxsr", true);
     setFeatureEnabledImpl(Features, "cx16", true);
@@ -3279,7 +3278,6 @@ bool X86TargetInfo::initFeatureMap(
     setFeatureEnabledImpl(Features, "xsaveopt", true);
     LLVM_FALLTHROUGH;
   case CK_Westmere:
-  case CK_Silvermont:
     setFeatureEnabledImpl(Features, "aes", true);
     setFeatureEnabledImpl(Features, "pclmul", true);
     LLVM_FALLTHROUGH;
@@ -3297,12 +3295,17 @@ bool X86TargetInfo::initFeatureMap(
     setFeatureEnabledImpl(Features, "xsaves", true);
     setFeatureEnabledImpl(Features, "clflushopt", true);
     setFeatureEnabledImpl(Features, "mpx", true);
+    LLVM_FALLTHROUGH;
+  case CK_Silvermont:
     setFeatureEnabledImpl(Features, "aes", true);
     setFeatureEnabledImpl(Features, "pclmul", true);
     setFeatureEnabledImpl(Features, "sse4.2", true);
+    LLVM_FALLTHROUGH;
+  case CK_Bonnell:
+    setFeatureEnabledImpl(Features, "ssse3", true);
     setFeatureEnabledImpl(Features, "fxsr", true);
     setFeatureEnabledImpl(Features, "cx16", true);
-  break;
+    break;
   case CK_KNL:
     setFeatureEnabledImpl(Features, "avx512f", true);
     setFeatureEnabledImpl(Features, "avx512cd", true);