[llvm] r291158 - [CostModel][X86] Move vXi64 MUL costs into existing tables. NFCI.

[Simon Pilgrim via llvm-commits]

Author: rksimon
Date: Thu Jan  5 13:01:50 2017
New Revision: 291158

URL: http://llvm.org/viewvc/llvm-project?rev=291158&view=rev
Log:
[CostModel][X86] Move vXi64 MUL costs into existing tables. NFCI.

Removes need for yet another LUT.

Modified:
    llvm/trunk/lib/Target/X86/X86TargetTransformInfo.cpp

Modified: llvm/trunk/lib/Target/X86/X86TargetTransformInfo.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/X86TargetTransformInfo.cpp?rev=291158&r1=291157&r2=291158&view=diff
==============================================================================
--- llvm/trunk/lib/Target/X86/X86TargetTransformInfo.cpp (original)
+++ llvm/trunk/lib/Target/X86/X86TargetTransformInfo.cpp Thu Jan  5 13:01:50 2017
@@ -253,6 +253,7 @@ int X86TTIImpl::getArithmeticInstrCost(
 
     { ISD::MUL,     MVT::v32i8,    13 }, // extend/pmullw/trunc sequence.
     { ISD::MUL,     MVT::v16i8,     5 }, // extend/pmullw/trunc sequence.
+    { ISD::MUL,     MVT::v8i64,     8 }  // 3*pmuludq/3*shift/2*add
   };
 
   if (ST->hasAVX512()) {
@@ -337,6 +338,7 @@ int X86TTIImpl::getArithmeticInstrCost(
 
     { ISD::MUL,   MVT::v32i8,     17 }, // extend/pmullw/trunc sequence.
     { ISD::MUL,   MVT::v16i8,      7 }, // extend/pmullw/trunc sequence.
+    { ISD::MUL,   MVT::v4i64,      8 }, // 3*pmuludq/3*shift/2*add
 
     { ISD::FDIV,  MVT::f32,        7 }, // Haswell from http://www.agner.org/
     { ISD::FDIV,  MVT::v4f32,      7 }, // Haswell from http://www.agner.org/
@@ -504,6 +506,7 @@ int X86TTIImpl::getArithmeticInstrCost(
     { ISD::SRA,  MVT::v4i64,  2*12 }, // srl/xor/sub sequence.
 
     { ISD::MUL,  MVT::v16i8,    12 }, // extend/pmullw/trunc sequence.
+    { ISD::MUL,  MVT::v2i64,     8 }, // 3*pmuludq/3*shift/2*add
 
     { ISD::FDIV, MVT::f32,      23 }, // Pentium IV from http://www.agner.org/
     { ISD::FDIV, MVT::v4f32,    39 }, // Pentium IV from http://www.agner.org/
@@ -561,17 +564,6 @@ int X86TTIImpl::getArithmeticInstrCost(
       return LT.first * Entry->Cost;
   }
 
-  // Custom lowering of vectors.
-  static const CostTblEntry CustomLowered[] = {
-    // A v2i64/v4i64 and multiply is custom lowered as a series of long
-    // multiplies(3), shifts(3) and adds(2).
-    { ISD::MUL,     MVT::v2i64,    8 },
-    { ISD::MUL,     MVT::v4i64,    8 },
-    { ISD::MUL,     MVT::v8i64,    8 }
-  };
-  if (const auto *Entry = CostTableLookup(CustomLowered, ISD, LT.second))
-    return LT.first * Entry->Cost;
-
   // Special lowering of v4i32 mul on sse2, sse3: Lower v4i32 mul as 2x shuffle,
   // 2x pmuludq, 2x shuffle.
   if (ISD == ISD::MUL && LT.second == MVT::v4i32 && ST->hasSSE2() &&