[llvm] [CostModel][X86] Update logic vector reduction costs to match llvm-mca estimates (PR #214191)
Simon Pilgrim via llvm-commits
llvm-commits at lists.llvm.org
Thu Aug 6 03:40:13 PDT 2026
================
@@ -5729,13 +5743,75 @@ X86TTIImpl::getArithmeticReductionCost(unsigned Opcode, VectorType *ValTy,
{ ISD::ADD, MVT::v8i32, {5, 5, 5, 5} },
{ ISD::ADD, MVT::v16i16, {5, 5, 5, 5} },
{ ISD::ADD, MVT::v32i8, {4, 4, 4, 4} },
+
+ { ISD::AND, MVT::v4i64, {3, 7, 5, 5} },
+ { ISD::AND, MVT::v8i32, {4, 9, 7, 7} },
+ { ISD::AND, MVT::v16i16, {5,11, 9, 9} },
+ { ISD::AND, MVT::v8i16, {4, 7, 7, 7} },
+ { ISD::AND, MVT::v32i8, {6,13,11,11} },
+ { ISD::AND, MVT::v16i8, {5,10, 9, 9} },
----------------
RKSimon wrote:
Fixed for silvermont and above - the bonnell model has some very dodgy numbers for gpr<->vec moves that makes the llvm-mca stats very suspicious
https://github.com/llvm/llvm-project/pull/214191
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