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X86TTI: Adjust sdiv cost now that we can lower it on plain SSE2.

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Includes a fix for a horrible typo that caused all SDIV costs to be
slightly off :)

llvm-svn: 207371
This commit is contained in:
Benjamin Kramer 2014-04-27 18:47:54 +00:00
parent cc45aefeb0
commit 764309a6cd
3 changed files with 8 additions and 3 deletions
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2
lib/CodeGen/TargetLoweringBase.cpp
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@ -1327,7 +1327,7 @@ int TargetLoweringBase::InstructionOpcodeToISD(unsigned Opcode) const {
case Mul: return ISD::MUL;
case FMul: return ISD::FMUL;
case UDiv: return ISD::UDIV;
case SDiv: return ISD::UDIV;
case SDiv: return ISD::SDIV;
case FDiv: return ISD::FDIV;
case URem: return ISD::UREM;
case SRem: return ISD::SREM;

5
lib/Target/X86/X86TargetTransformInfo.cpp
View File

@ -369,11 +369,16 @@ unsigned X86TTI::getArithmeticInstrCost(unsigned Opcode, Type *Ty,
{ ISD::SDIV, MVT::v8i16, 6 }, // pmulhw sequence
{ ISD::UDIV, MVT::v8i16, 6 }, // pmulhuw sequence
{ ISD::SDIV, MVT::v4i32, 19 }, // pmuludq sequence
{ ISD::UDIV, MVT::v4i32, 15 }, // pmuludq sequence
};
if (Op2Info == TargetTransformInfo::OK_UniformConstantValue &&
ST->hasSSE2()) {
// pmuldq sequence.
if (ISD == ISD::SDIV && LT.second == MVT::v4i32 && ST->hasSSE41())
return LT.first * 15;
int Idx = CostTableLookup(SSE2UniformConstCostTable, ISD, LT.second);
if (Idx != -1)
return LT.first * SSE2UniformConstCostTable[Idx].Cost;

4
test/Analysis/CostModel/X86/vdiv-cost.ll
View File

@ -69,7 +69,7 @@ define <4 x i32> @test8(<4 x i32> %a) {
ret <4 x i32> %div
; CHECK: 'Cost Model Analysis' for function 'test8':
; SSE2: Found an estimated cost of 15 for instruction: %div
; SSE2: Found an estimated cost of 19 for instruction: %div
; AVX2: Found an estimated cost of 15 for instruction: %div
}
@ -78,7 +78,7 @@ define <8 x i32> @test9(<8 x i32> %a) {
ret <8 x i32> %div
; CHECK: 'Cost Model Analysis' for function 'test9':
; SSE2: Found an estimated cost of 30 for instruction: %div
; SSE2: Found an estimated cost of 38 for instruction: %div
; AVX2: Found an estimated cost of 15 for instruction: %div
}