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[RISCV][CostModel] Remove cost of icmp inst in icmp+select with SFB. (#91158)
With ShortFowrardBranchOpt(SFB) or ConditionalMoveFusion, scalar ICmp and scalar Select instructions will lower to SELECT_CC and lower to PseudoCCMOVGPR which will generate a conditional branch instruction and a move instruction. The cost of scalar (ICmp + Select) = (0 + Select instruction cost)
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‎llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp

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Original file line numberDiff line numberDiff line change
@@ -14,9 +14,11 @@
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#include "llvm/CodeGen/CostTable.h"
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#include "llvm/CodeGen/TargetLowering.h"
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#include "llvm/IR/Instructions.h"
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#include "llvm/IR/PatternMatch.h"
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#include <cmath>
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#include <optional>
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using namespace llvm;
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using namespace llvm::PatternMatch;
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#define DEBUG_TYPE "riscvtti"
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@@ -1469,6 +1471,21 @@ InstructionCost RISCVTTIImpl::getCmpSelInstrCost(unsigned Opcode, Type *ValTy,
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}
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}
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// With ShortForwardBranchOpt or ConditionalMoveFusion, scalar icmp + select
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// instructions will lower to SELECT_CC and lower to PseudoCCMOVGPR which will
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// generate a conditional branch + mv. The cost of scalar (icmp + select) will
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// be (0 + select instr cost).
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if (ST->hasConditionalMoveFusion() && I && isa<ICmpInst>(I) &&
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ValTy->isIntegerTy() && !I->user_empty()) {
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if (all_of(I->users(), [&](const User *U) {
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return match(U, m_Select(m_Specific(I), m_Value(), m_Value())) &&
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U->getType()->isIntegerTy() &&
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!isa<ConstantData>(U->getOperand(1)) &&
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!isa<ConstantData>(U->getOperand(2));
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}))
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return 0;
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}
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// TODO: Add cost for scalar type.
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return BaseT::getCmpSelInstrCost(Opcode, ValTy, CondTy, VecPred, CostKind, I);

‎llvm/test/Analysis/CostModel/RISCV/cmp-select.ll

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; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py
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; RUN: opt < %s -mtriple=riscv64 -mattr=+v,+f,+short-forward-branch-opt -passes="print<cost-model>" -cost-kind=throughput 2>&1 -disable-output | FileCheck %s --check-prefixes=SFB64
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; RUN: opt < %s -mtriple=riscv64 -mattr=+v,+f -passes="print<cost-model>" -cost-kind=throughput 2>&1 -disable-output | FileCheck %s --check-prefixes=RV64
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define i32 @icmp-iselect(i64 %ca, i64 %cb, i32 %a, i32 %b) {
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; SFB64-LABEL: 'icmp-iselect'
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; SFB64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %cmp1 = icmp slt i64 %ca, %cb
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; SFB64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %select1 = select i1 %cmp1, i32 %a, i32 %b
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; SFB64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret i32 %select1
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;
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; RV64-LABEL: 'icmp-iselect'
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; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %cmp1 = icmp slt i64 %ca, %cb
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; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %select1 = select i1 %cmp1, i32 %a, i32 %b
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; RV64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret i32 %select1
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;
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%cmp1 = icmp slt i64 %ca, %cb
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%select1 = select i1 %cmp1, i32 %a, i32 %b
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ret i32 %select1
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}
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define i32 @icmp-iselects(i64 %ca, i64 %cb, i32 %a, i32 %b, i32 %c) {
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; SFB64-LABEL: 'icmp-iselects'
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; SFB64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %cmp1 = icmp slt i64 %ca, %cb
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; SFB64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %select1 = select i1 %cmp1, i32 %a, i32 %b
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; SFB64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %select2 = select i1 %cmp1, i32 %a, i32 %c
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; SFB64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %ret = add i32 %select1, %select2
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; SFB64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret i32 %ret
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;
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; RV64-LABEL: 'icmp-iselects'
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; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %cmp1 = icmp slt i64 %ca, %cb
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; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %select1 = select i1 %cmp1, i32 %a, i32 %b
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; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %select2 = select i1 %cmp1, i32 %a, i32 %c
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; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %ret = add i32 %select1, %select2
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; RV64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret i32 %ret
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;
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%cmp1 = icmp slt i64 %ca, %cb
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%select1 = select i1 %cmp1, i32 %a, i32 %b
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%select2 = select i1 %cmp1, i32 %a, i32 %c
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%ret = add i32 %select1, %select2
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ret i32 %ret
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}
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define i32 @icmp-ifselects(i64 %ca, i64 %cb, i32 %a, i32 %b, float %c, float %d) {
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; SFB64-LABEL: 'icmp-ifselects'
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; SFB64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %cmp1 = icmp slt i64 %ca, %cb
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; SFB64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %select1 = select i1 %cmp1, i32 %a, i32 %b
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; SFB64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %select2 = select i1 %cmp1, float %c, float %d
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; SFB64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %selectint = fptosi float %select2 to i32
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; SFB64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %ret = add i32 %select1, %selectint
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; SFB64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret i32 %ret
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;
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; RV64-LABEL: 'icmp-ifselects'
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; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %cmp1 = icmp slt i64 %ca, %cb
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; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %select1 = select i1 %cmp1, i32 %a, i32 %b
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; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %select2 = select i1 %cmp1, float %c, float %d
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; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %selectint = fptosi float %select2 to i32
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; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %ret = add i32 %select1, %selectint
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; RV64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret i32 %ret
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;
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%cmp1 = icmp slt i64 %ca, %cb
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%select1 = select i1 %cmp1, i32 %a, i32 %b
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%select2 = select i1 %cmp1, float %c, float %d
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%selectint = fptosi float %select2 to i32
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%ret = add i32 %select1, %selectint
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ret i32 %ret
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}
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define i32 @constant-icmp-iselect(i64 %ca, i64 %cb, i32 %a) {
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; SFB64-LABEL: 'constant-icmp-iselect'
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; SFB64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %cmp1 = icmp slt i64 %ca, %cb
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; SFB64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %select1 = select i1 %cmp1, i32 %a, i32 7
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; SFB64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret i32 %select1
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;
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; RV64-LABEL: 'constant-icmp-iselect'
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; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %cmp1 = icmp slt i64 %ca, %cb
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; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %select1 = select i1 %cmp1, i32 %a, i32 7
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; RV64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret i32 %select1
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;
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%cmp1 = icmp slt i64 %ca, %cb
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%select1 = select i1 %cmp1, i32 %a, i32 7
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ret i32 %select1
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}
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define i32 @fcmp-iselect(float %ca, float %cb, i32 %a, i32 %b) {
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; SFB64-LABEL: 'fcmp-iselect'
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; SFB64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %fcmp1 = fcmp ogt float %ca, %cb
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; SFB64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %select1 = select i1 %fcmp1, i32 %a, i32 %b
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; SFB64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret i32 %select1
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;
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; RV64-LABEL: 'fcmp-iselect'
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; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %fcmp1 = fcmp ogt float %ca, %cb
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; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %select1 = select i1 %fcmp1, i32 %a, i32 %b
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; RV64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret i32 %select1
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;
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%fcmp1 = fcmp ogt float %ca, %cb
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%select1 = select i1 %fcmp1, i32 %a, i32 %b
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ret i32 %select1
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}
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define float @fcmp-fselect(float %ca, float %cb, float %a, float %b) {
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; SFB64-LABEL: 'fcmp-fselect'
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; SFB64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %fcmp1 = fcmp ogt float %ca, %cb
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; SFB64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %fselect1 = select i1 %fcmp1, float %a, float %b
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; SFB64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret float %fselect1
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;
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; RV64-LABEL: 'fcmp-fselect'
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; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %fcmp1 = fcmp ogt float %ca, %cb
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; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %fselect1 = select i1 %fcmp1, float %a, float %b
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; RV64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret float %fselect1
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;
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%fcmp1 = fcmp ogt float %ca, %cb
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%fselect1 = select i1 %fcmp1, float %a, float %b
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ret float %fselect1
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}
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define float @icmp-fselect(i64 %ca, i64 %cb, float %a, float %b) {
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; SFB64-LABEL: 'icmp-fselect'
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; SFB64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %icmp1 = icmp slt i64 %ca, %cb
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; SFB64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %fselect1 = select i1 %icmp1, float %a, float %b
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; SFB64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret float %fselect1
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;
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; RV64-LABEL: 'icmp-fselect'
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; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %icmp1 = icmp slt i64 %ca, %cb
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; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %fselect1 = select i1 %icmp1, float %a, float %b
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; RV64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret float %fselect1
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;
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%icmp1 = icmp slt i64 %ca, %cb
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%fselect1 = select i1 %icmp1, float %a, float %b
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ret float %fselect1
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}
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define <2 x i32> @vector-icmp-vector-iselect(<2 x i32> %ca, <2 x i32> %cb, <2 x i32> %a, <2 x i32> %b) {
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; SFB64-LABEL: 'vector-icmp-vector-iselect'
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; SFB64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %icmp = icmp slt <2 x i32> %ca, %cb
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; SFB64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %select1 = select <2 x i1> %icmp, <2 x i32> %a, <2 x i32> %b
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; SFB64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret <2 x i32> %select1
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;
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; RV64-LABEL: 'vector-icmp-vector-iselect'
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; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %icmp = icmp slt <2 x i32> %ca, %cb
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; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %select1 = select <2 x i1> %icmp, <2 x i32> %a, <2 x i32> %b
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; RV64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret <2 x i32> %select1
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;
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%icmp = icmp slt <2 x i32> %ca, %cb
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%select1 = select <2 x i1> %icmp, <2 x i32> %a, <2 x i32> %b
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ret <2 x i32> %select1
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}
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define <2 x i32> @vector-fcmp-vector-iselect(<2 x float> %ca, <2 x float> %cb, <2 x i32> %a, <2 x i32> %b) {
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; SFB64-LABEL: 'vector-fcmp-vector-iselect'
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; SFB64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %fcmp1 = fcmp ogt <2 x float> %ca, %cb
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; SFB64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %select1 = select <2 x i1> %fcmp1, <2 x i32> %a, <2 x i32> %b
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; SFB64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret <2 x i32> %select1
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;
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; RV64-LABEL: 'vector-fcmp-vector-iselect'
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; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %fcmp1 = fcmp ogt <2 x float> %ca, %cb
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; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %select1 = select <2 x i1> %fcmp1, <2 x i32> %a, <2 x i32> %b
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; RV64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret <2 x i32> %select1
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;
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%fcmp1 = fcmp ogt <2 x float> %ca, %cb
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%select1 = select <2 x i1> %fcmp1, <2 x i32> %a, <2 x i32> %b
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ret <2 x i32> %select1
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}
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define <2 x float> @vector-fcmp-vector-fselect(<2 x float> %ca, <2 x float> %cb, <2 x float> %a, <2 x float> %b) {
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; SFB64-LABEL: 'vector-fcmp-vector-fselect'
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; SFB64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %fcmp1 = fcmp ogt <2 x float> %ca, %cb
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; SFB64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %select1 = select <2 x i1> %fcmp1, <2 x float> %a, <2 x float> %b
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; SFB64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret <2 x float> %select1
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;
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; RV64-LABEL: 'vector-fcmp-vector-fselect'
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; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %fcmp1 = fcmp ogt <2 x float> %ca, %cb
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; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %select1 = select <2 x i1> %fcmp1, <2 x float> %a, <2 x float> %b
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; RV64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret <2 x float> %select1
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;
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%fcmp1 = fcmp ogt <2 x float> %ca, %cb
176+
%select1 = select <2 x i1> %fcmp1, <2 x float> %a, <2 x float> %b
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ret <2 x float> %select1
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}
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define <2 x float> @vector-icmp-vector-fselect(<2 x i32> %ca, <2 x i32> %cb, <2 x float> %a, <2 x float> %b) {
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; SFB64-LABEL: 'vector-icmp-vector-fselect'
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; SFB64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %icmp1 = icmp slt <2 x i32> %ca, %cb
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; SFB64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %select1 = select <2 x i1> %icmp1, <2 x float> %a, <2 x float> %b
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; SFB64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret <2 x float> %select1
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;
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; RV64-LABEL: 'vector-icmp-vector-fselect'
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; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %icmp1 = icmp slt <2 x i32> %ca, %cb
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; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %select1 = select <2 x i1> %icmp1, <2 x float> %a, <2 x float> %b
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; RV64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret <2 x float> %select1
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;
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%icmp1 = icmp slt <2 x i32> %ca, %cb
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%select1 = select <2 x i1> %icmp1, <2 x float> %a, <2 x float> %b
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ret <2 x float> %select1
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}
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define <2 x float> @icmp-vector-fselect(i1 %ca, i1 %cb, <2 x float> %a, <2 x float> %b) {
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; SFB64-LABEL: 'icmp-vector-fselect'
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; SFB64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %icmp1 = icmp slt i1 %ca, %cb
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; SFB64-NEXT: Cost Model: Found an estimated cost of 3 for instruction: %select1 = select i1 %icmp1, <2 x float> %a, <2 x float> %b
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; SFB64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret <2 x float> %select1
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;
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; RV64-LABEL: 'icmp-vector-fselect'
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; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %icmp1 = icmp slt i1 %ca, %cb
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; RV64-NEXT: Cost Model: Found an estimated cost of 3 for instruction: %select1 = select i1 %icmp1, <2 x float> %a, <2 x float> %b
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; RV64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret <2 x float> %select1
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;
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%icmp1 = icmp slt i1 %ca, %cb
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%select1 = select i1 %icmp1, <2 x float> %a, <2 x float> %b
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ret <2 x float> %select1
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}
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define <2 x i32> @icmp-vector-iselect(i1 %ca, i1 %cb, <2 x i32> %a, <2 x i32> %b) {
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; SFB64-LABEL: 'icmp-vector-iselect'
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; SFB64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %icmp1 = icmp slt i1 %ca, %cb
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; SFB64-NEXT: Cost Model: Found an estimated cost of 3 for instruction: %select1 = select i1 %icmp1, <2 x i32> %a, <2 x i32> %b
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; SFB64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret <2 x i32> %select1
217+
;
218+
; RV64-LABEL: 'icmp-vector-iselect'
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; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %icmp1 = icmp slt i1 %ca, %cb
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; RV64-NEXT: Cost Model: Found an estimated cost of 3 for instruction: %select1 = select i1 %icmp1, <2 x i32> %a, <2 x i32> %b
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; RV64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret <2 x i32> %select1
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;
223+
%icmp1 = icmp slt i1 %ca, %cb
224+
%select1 = select i1 %icmp1, <2 x i32> %a, <2 x i32> %b
225+
ret <2 x i32> %select1
226+
}
227+
228+
define <2 x float> @fcmp-vector-fselect(float %ca, float %cb, <2 x float> %a, <2 x float> %b) {
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; SFB64-LABEL: 'fcmp-vector-fselect'
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; SFB64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %fcmp1 = fcmp ogt float %ca, %cb
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; SFB64-NEXT: Cost Model: Found an estimated cost of 3 for instruction: %select1 = select i1 %fcmp1, <2 x float> %a, <2 x float> %b
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; SFB64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret <2 x float> %select1
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;
234+
; RV64-LABEL: 'fcmp-vector-fselect'
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; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %fcmp1 = fcmp ogt float %ca, %cb
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; RV64-NEXT: Cost Model: Found an estimated cost of 3 for instruction: %select1 = select i1 %fcmp1, <2 x float> %a, <2 x float> %b
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; RV64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret <2 x float> %select1
238+
;
239+
%fcmp1 = fcmp ogt float %ca, %cb
240+
%select1 = select i1 %fcmp1, <2 x float> %a, <2 x float> %b
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ret <2 x float> %select1
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}
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define <2 x i32> @fcmp-vector-iselect(float %ca, float %cb, <2 x i32> %a, <2 x i32> %b) {
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; SFB64-LABEL: 'fcmp-vector-iselect'
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; SFB64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %fcmp1 = fcmp ogt float %ca, %cb
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; SFB64-NEXT: Cost Model: Found an estimated cost of 3 for instruction: %select1 = select i1 %fcmp1, <2 x i32> %a, <2 x i32> %b
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; SFB64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret <2 x i32> %select1
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;
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; RV64-LABEL: 'fcmp-vector-iselect'
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; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %fcmp1 = fcmp ogt float %ca, %cb
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; RV64-NEXT: Cost Model: Found an estimated cost of 3 for instruction: %select1 = select i1 %fcmp1, <2 x i32> %a, <2 x i32> %b
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; RV64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret <2 x i32> %select1
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;
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%fcmp1 = fcmp ogt float %ca, %cb
256+
%select1 = select i1 %fcmp1, <2 x i32> %a, <2 x i32> %b
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ret <2 x i32> %select1
258+
}

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