[CostModel][X86] Reordered SSE42 arithmetic cost LUT into descending order. NFCI.

llvm-svn: 291162

1 files changed, 11 insertions, 13 deletions

diff --git a/llvm/lib/Target/X86/X86TargetTransformInfo.cpp b/llvm/lib/Target/X86/X86TargetTransformInfo.cpp
index a4a040f6620..8a98501abea 100644
--- a/llvm/lib/Target/X86/X86TargetTransformInfo.cpp
+++ b/llvm/lib/Target/X86/X86TargetTransformInfo.cpp
@@ -383,19 +383,6 @@ int X86TTIImpl::getArithmeticInstrCost(
       return LT.first * Entry->Cost;
   }
 
-  static const CostTblEntry SSE42FloatCostTable[] = {
-    { ISD::FDIV,  MVT::f32,   14 }, // Nehalem from http://www.agner.org/
-    { ISD::FDIV,  MVT::v4f32, 14 }, // Nehalem from http://www.agner.org/
-    { ISD::FDIV,  MVT::f64,   22 }, // Nehalem from http://www.agner.org/
-    { ISD::FDIV,  MVT::v2f64, 22 }, // Nehalem from http://www.agner.org/
-  };
-
-  if (ST->hasSSE42()) {
-    if (const auto *Entry = CostTableLookup(SSE42FloatCostTable, ISD,
-                                            LT.second))
-      return LT.first * Entry->Cost;
-  }
-
   static const CostTblEntry
   SSE2UniformCostTable[] = {
     // Uniform splats are cheaper for the following instructions.
@@ -457,6 +444,17 @@ int X86TTIImpl::getArithmeticInstrCost(
       ISD = ISD::MUL;
   }
 
+  static const CostTblEntry SSE42CostTable[] = {
+    { ISD::FDIV,  MVT::f32,   14 }, // Nehalem from http://www.agner.org/
+    { ISD::FDIV,  MVT::v4f32, 14 }, // Nehalem from http://www.agner.org/
+    { ISD::FDIV,  MVT::f64,   22 }, // Nehalem from http://www.agner.org/
+    { ISD::FDIV,  MVT::v2f64, 22 }, // Nehalem from http://www.agner.org/
+  };
+
+  if (ST->hasSSE42())
+    if (const auto *Entry = CostTableLookup(SSE42CostTable, ISD, LT.second))
+      return LT.first * Entry->Cost;
+
   static const CostTblEntry SSE41CostTable[] = {
     { ISD::SHL,  MVT::v16i8,    11 }, // pblendvb sequence.
     { ISD::SHL,  MVT::v32i8,  2*11 }, // pblendvb sequence.