[llvm] 1c12e12 - [CostModel][X86] Add fdiv(double) throughput x87 costs for

[Simon Pilgrim via llvm-commits]

Author: Simon Pilgrim
Date: 2022-09-03T14:08:25+01:00
New Revision: 1c12e1211198a67cbe0a81118027e225e09476d2

URL: https://github.com/llvm/llvm-project/commit/1c12e1211198a67cbe0a81118027e225e09476d2
DIFF: https://github.com/llvm/llvm-project/commit/1c12e1211198a67cbe0a81118027e225e09476d2.diff

LOG: [CostModel][X86] Add fdiv(double) throughput x87 costs for

Added: 
    

Modified: 
    llvm/lib/Target/X86/X86TargetTransformInfo.cpp
    llvm/test/Analysis/CostModel/X86/arith-fp.ll

Removed: 
    


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diff  --git a/llvm/lib/Target/X86/X86TargetTransformInfo.cpp b/llvm/lib/Target/X86/X86TargetTransformInfo.cpp
index d556a5b109557..a06a42e66cef7 100644
--- a/llvm/lib/Target/X86/X86TargetTransformInfo.cpp
+++ b/llvm/lib/Target/X86/X86TargetTransformInfo.cpp
@@ -1189,6 +1189,7 @@ InstructionCost X86TTIImpl::getArithmeticInstrCost(
     { ISD::FADD, MVT::f64, {  2,  3, 1, 1 } }, // (x87)
     { ISD::FSUB, MVT::f64, {  2,  3, 1, 1 } }, // (x87)
     { ISD::FMUL, MVT::f64, {  2,  5, 1, 1 } }, // (x87)
+    { ISD::FDIV, MVT::f64, { 38 } }, // (x87)
   };
 
   if (const auto *Entry = CostTableLookup(X86CostTbl, ISD, LT.second))

diff  --git a/llvm/test/Analysis/CostModel/X86/arith-fp.ll b/llvm/test/Analysis/CostModel/X86/arith-fp.ll
index 14f62df323680..ff41e4dcb5172 100644
--- a/llvm/test/Analysis/CostModel/X86/arith-fp.ll
+++ b/llvm/test/Analysis/CostModel/X86/arith-fp.ll
@@ -527,10 +527,10 @@ define i32 @fdiv(i32 %arg) {
 ; SSE1-NEXT:  Cost Model: Found an estimated cost of 34 for instruction: %V4F32 = fdiv <4 x float> undef, undef
 ; SSE1-NEXT:  Cost Model: Found an estimated cost of 68 for instruction: %V8F32 = fdiv <8 x float> undef, undef
 ; SSE1-NEXT:  Cost Model: Found an estimated cost of 136 for instruction: %V16F32 = fdiv <16 x float> undef, undef
-; SSE1-NEXT:  Cost Model: Found an estimated cost of 2 for instruction: %F64 = fdiv double undef, undef
-; SSE1-NEXT:  Cost Model: Found an estimated cost of 4 for instruction: %V2F64 = fdiv <2 x double> undef, undef
-; SSE1-NEXT:  Cost Model: Found an estimated cost of 8 for instruction: %V4F64 = fdiv <4 x double> undef, undef
-; SSE1-NEXT:  Cost Model: Found an estimated cost of 16 for instruction: %V8F64 = fdiv <8 x double> undef, undef
+; SSE1-NEXT:  Cost Model: Found an estimated cost of 38 for instruction: %F64 = fdiv double undef, undef
+; SSE1-NEXT:  Cost Model: Found an estimated cost of 76 for instruction: %V2F64 = fdiv <2 x double> undef, undef
+; SSE1-NEXT:  Cost Model: Found an estimated cost of 152 for instruction: %V4F64 = fdiv <4 x double> undef, undef
+; SSE1-NEXT:  Cost Model: Found an estimated cost of 304 for instruction: %V8F64 = fdiv <8 x double> undef, undef
 ; SSE1-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: ret i32 undef
 ;
 ; SSE2-LABEL: 'fdiv'