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[RISCV][CostModel] Remove cost of icmp inst in icmp+select with SFB. #91158

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17 changes: 17 additions & 0 deletions llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp
Original file line number Diff line number Diff line change
Expand Up @@ -14,9 +14,11 @@
#include "llvm/CodeGen/CostTable.h"
#include "llvm/CodeGen/TargetLowering.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/PatternMatch.h"
#include <cmath>
#include <optional>
using namespace llvm;
using namespace llvm::PatternMatch;

#define DEBUG_TYPE "riscvtti"

Expand Down Expand Up @@ -1443,6 +1445,21 @@ InstructionCost RISCVTTIImpl::getCmpSelInstrCost(unsigned Opcode, Type *ValTy,
}
}

// With ShortForwardBranchOpt or ConditionalMoveFusion, scalar icmp + select
// instructions will lower to SELECT_CC and lower to PseudoCCMOVGPR which will
// generate a conditional branch + mv. The cost of scalar (icmp + select) will
// be (0 + select instr cost).
if (ST->hasConditionalMoveFusion() && I && isa<ICmpInst>(I) &&
ValTy->isIntegerTy() && !I->user_empty()) {
if (all_of(I->users(), [&](const User *U) {
return match(U, m_Select(m_Specific(I), m_Value(), m_Value())) &&
U->getType()->isIntegerTy() &&
!isa<ConstantData>(U->getOperand(1)) &&
!isa<ConstantData>(U->getOperand(2));
}))
return 0;
}

// TODO: Add cost for scalar type.

return BaseT::getCmpSelInstrCost(Opcode, ValTy, CondTy, VecPred, CostKind, I);
Expand Down
258 changes: 258 additions & 0 deletions llvm/test/Analysis/CostModel/RISCV/cmp-select.ll
Original file line number Diff line number Diff line change
@@ -0,0 +1,258 @@
; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py
; 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
; RUN: opt < %s -mtriple=riscv64 -mattr=+v,+f -passes="print<cost-model>" -cost-kind=throughput 2>&1 -disable-output | FileCheck %s --check-prefixes=RV64

define i32 @icmp-iselect(i64 %ca, i64 %cb, i32 %a, i32 %b) {
; SFB64-LABEL: 'icmp-iselect'
; SFB64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %cmp1 = icmp slt i64 %ca, %cb
; SFB64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %select1 = select i1 %cmp1, i32 %a, i32 %b
; SFB64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret i32 %select1
;
; RV64-LABEL: 'icmp-iselect'
; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %cmp1 = icmp slt i64 %ca, %cb
; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %select1 = select i1 %cmp1, i32 %a, i32 %b
; RV64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret i32 %select1
;
%cmp1 = icmp slt i64 %ca, %cb
%select1 = select i1 %cmp1, i32 %a, i32 %b
ret i32 %select1
}

define i32 @icmp-iselects(i64 %ca, i64 %cb, i32 %a, i32 %b, i32 %c) {
; SFB64-LABEL: 'icmp-iselects'
; SFB64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %cmp1 = icmp slt i64 %ca, %cb
; SFB64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %select1 = select i1 %cmp1, i32 %a, i32 %b
; SFB64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %select2 = select i1 %cmp1, i32 %a, i32 %c
; SFB64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %ret = add i32 %select1, %select2
; SFB64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret i32 %ret
;
; RV64-LABEL: 'icmp-iselects'
; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %cmp1 = icmp slt i64 %ca, %cb
; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %select1 = select i1 %cmp1, i32 %a, i32 %b
; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %select2 = select i1 %cmp1, i32 %a, i32 %c
; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %ret = add i32 %select1, %select2
; RV64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret i32 %ret
;
%cmp1 = icmp slt i64 %ca, %cb
%select1 = select i1 %cmp1, i32 %a, i32 %b
%select2 = select i1 %cmp1, i32 %a, i32 %c
%ret = add i32 %select1, %select2
ret i32 %ret
}

define i32 @icmp-ifselects(i64 %ca, i64 %cb, i32 %a, i32 %b, float %c, float %d) {
; SFB64-LABEL: 'icmp-ifselects'
; SFB64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %cmp1 = icmp slt i64 %ca, %cb
; SFB64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %select1 = select i1 %cmp1, i32 %a, i32 %b
; SFB64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %select2 = select i1 %cmp1, float %c, float %d
; SFB64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %selectint = fptosi float %select2 to i32
; SFB64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %ret = add i32 %select1, %selectint
; SFB64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret i32 %ret
;
; RV64-LABEL: 'icmp-ifselects'
; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %cmp1 = icmp slt i64 %ca, %cb
; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %select1 = select i1 %cmp1, i32 %a, i32 %b
; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %select2 = select i1 %cmp1, float %c, float %d
; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %selectint = fptosi float %select2 to i32
; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %ret = add i32 %select1, %selectint
; RV64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret i32 %ret
;
%cmp1 = icmp slt i64 %ca, %cb
%select1 = select i1 %cmp1, i32 %a, i32 %b
%select2 = select i1 %cmp1, float %c, float %d
%selectint = fptosi float %select2 to i32
%ret = add i32 %select1, %selectint
ret i32 %ret
}

define i32 @constant-icmp-iselect(i64 %ca, i64 %cb, i32 %a) {
; SFB64-LABEL: 'constant-icmp-iselect'
; SFB64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %cmp1 = icmp slt i64 %ca, %cb
; SFB64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %select1 = select i1 %cmp1, i32 %a, i32 7
; SFB64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret i32 %select1
;
; RV64-LABEL: 'constant-icmp-iselect'
; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %cmp1 = icmp slt i64 %ca, %cb
; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %select1 = select i1 %cmp1, i32 %a, i32 7
; RV64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret i32 %select1
;
%cmp1 = icmp slt i64 %ca, %cb
%select1 = select i1 %cmp1, i32 %a, i32 7
ret i32 %select1
}

define i32 @fcmp-iselect(float %ca, float %cb, i32 %a, i32 %b) {
; SFB64-LABEL: 'fcmp-iselect'
; SFB64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %fcmp1 = fcmp ogt float %ca, %cb
; SFB64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %select1 = select i1 %fcmp1, i32 %a, i32 %b
; SFB64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret i32 %select1
;
; RV64-LABEL: 'fcmp-iselect'
; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %fcmp1 = fcmp ogt float %ca, %cb
; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %select1 = select i1 %fcmp1, i32 %a, i32 %b
; RV64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret i32 %select1
;
%fcmp1 = fcmp ogt float %ca, %cb
%select1 = select i1 %fcmp1, i32 %a, i32 %b
ret i32 %select1
}

define float @fcmp-fselect(float %ca, float %cb, float %a, float %b) {
; SFB64-LABEL: 'fcmp-fselect'
; SFB64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %fcmp1 = fcmp ogt float %ca, %cb
; SFB64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %fselect1 = select i1 %fcmp1, float %a, float %b
; SFB64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret float %fselect1
;
; RV64-LABEL: 'fcmp-fselect'
; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %fcmp1 = fcmp ogt float %ca, %cb
; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %fselect1 = select i1 %fcmp1, float %a, float %b
; RV64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret float %fselect1
;
%fcmp1 = fcmp ogt float %ca, %cb
%fselect1 = select i1 %fcmp1, float %a, float %b
ret float %fselect1
}

define float @icmp-fselect(i64 %ca, i64 %cb, float %a, float %b) {
; SFB64-LABEL: 'icmp-fselect'
; SFB64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %icmp1 = icmp slt i64 %ca, %cb
; SFB64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %fselect1 = select i1 %icmp1, float %a, float %b
; SFB64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret float %fselect1
;
; RV64-LABEL: 'icmp-fselect'
; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %icmp1 = icmp slt i64 %ca, %cb
; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %fselect1 = select i1 %icmp1, float %a, float %b
; RV64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret float %fselect1
;
%icmp1 = icmp slt i64 %ca, %cb
%fselect1 = select i1 %icmp1, float %a, float %b
ret float %fselect1
}

define <2 x i32> @vector-icmp-vector-iselect(<2 x i32> %ca, <2 x i32> %cb, <2 x i32> %a, <2 x i32> %b) {
; SFB64-LABEL: 'vector-icmp-vector-iselect'
; SFB64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %icmp = icmp slt <2 x i32> %ca, %cb
; 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
; SFB64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret <2 x i32> %select1
;
; RV64-LABEL: 'vector-icmp-vector-iselect'
; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %icmp = icmp slt <2 x i32> %ca, %cb
; 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
; RV64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret <2 x i32> %select1
;
%icmp = icmp slt <2 x i32> %ca, %cb
%select1 = select <2 x i1> %icmp, <2 x i32> %a, <2 x i32> %b
ret <2 x i32> %select1
}

define <2 x i32> @vector-fcmp-vector-iselect(<2 x float> %ca, <2 x float> %cb, <2 x i32> %a, <2 x i32> %b) {
; SFB64-LABEL: 'vector-fcmp-vector-iselect'
; SFB64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %fcmp1 = fcmp ogt <2 x float> %ca, %cb
; 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
; SFB64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret <2 x i32> %select1
;
; RV64-LABEL: 'vector-fcmp-vector-iselect'
; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %fcmp1 = fcmp ogt <2 x float> %ca, %cb
; 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
; RV64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret <2 x i32> %select1
;
%fcmp1 = fcmp ogt <2 x float> %ca, %cb
%select1 = select <2 x i1> %fcmp1, <2 x i32> %a, <2 x i32> %b
ret <2 x i32> %select1
}

define <2 x float> @vector-fcmp-vector-fselect(<2 x float> %ca, <2 x float> %cb, <2 x float> %a, <2 x float> %b) {
; SFB64-LABEL: 'vector-fcmp-vector-fselect'
; SFB64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %fcmp1 = fcmp ogt <2 x float> %ca, %cb
; 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
; SFB64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret <2 x float> %select1
;
; RV64-LABEL: 'vector-fcmp-vector-fselect'
; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %fcmp1 = fcmp ogt <2 x float> %ca, %cb
; 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
; RV64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret <2 x float> %select1
;
%fcmp1 = fcmp ogt <2 x float> %ca, %cb
%select1 = select <2 x i1> %fcmp1, <2 x float> %a, <2 x float> %b
ret <2 x float> %select1
}

define <2 x float> @vector-icmp-vector-fselect(<2 x i32> %ca, <2 x i32> %cb, <2 x float> %a, <2 x float> %b) {
; SFB64-LABEL: 'vector-icmp-vector-fselect'
; SFB64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %icmp1 = icmp slt <2 x i32> %ca, %cb
; 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
; SFB64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret <2 x float> %select1
;
; RV64-LABEL: 'vector-icmp-vector-fselect'
; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %icmp1 = icmp slt <2 x i32> %ca, %cb
; 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
; RV64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret <2 x float> %select1
;
%icmp1 = icmp slt <2 x i32> %ca, %cb
%select1 = select <2 x i1> %icmp1, <2 x float> %a, <2 x float> %b
ret <2 x float> %select1
}

define <2 x float> @icmp-vector-fselect(i1 %ca, i1 %cb, <2 x float> %a, <2 x float> %b) {
; SFB64-LABEL: 'icmp-vector-fselect'
; SFB64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %icmp1 = icmp slt i1 %ca, %cb
; SFB64-NEXT: Cost Model: Found an estimated cost of 3 for instruction: %select1 = select i1 %icmp1, <2 x float> %a, <2 x float> %b
; SFB64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret <2 x float> %select1
;
; RV64-LABEL: 'icmp-vector-fselect'
; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %icmp1 = icmp slt i1 %ca, %cb
; RV64-NEXT: Cost Model: Found an estimated cost of 3 for instruction: %select1 = select i1 %icmp1, <2 x float> %a, <2 x float> %b
; RV64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret <2 x float> %select1
;
%icmp1 = icmp slt i1 %ca, %cb
%select1 = select i1 %icmp1, <2 x float> %a, <2 x float> %b
ret <2 x float> %select1
}

define <2 x i32> @icmp-vector-iselect(i1 %ca, i1 %cb, <2 x i32> %a, <2 x i32> %b) {
; SFB64-LABEL: 'icmp-vector-iselect'
; SFB64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %icmp1 = icmp slt i1 %ca, %cb
; SFB64-NEXT: Cost Model: Found an estimated cost of 3 for instruction: %select1 = select i1 %icmp1, <2 x i32> %a, <2 x i32> %b
; SFB64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret <2 x i32> %select1
;
; RV64-LABEL: 'icmp-vector-iselect'
; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %icmp1 = icmp slt i1 %ca, %cb
; RV64-NEXT: Cost Model: Found an estimated cost of 3 for instruction: %select1 = select i1 %icmp1, <2 x i32> %a, <2 x i32> %b
; RV64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret <2 x i32> %select1
;
%icmp1 = icmp slt i1 %ca, %cb
%select1 = select i1 %icmp1, <2 x i32> %a, <2 x i32> %b
ret <2 x i32> %select1
}

define <2 x float> @fcmp-vector-fselect(float %ca, float %cb, <2 x float> %a, <2 x float> %b) {
; SFB64-LABEL: 'fcmp-vector-fselect'
; SFB64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %fcmp1 = fcmp ogt float %ca, %cb
; SFB64-NEXT: Cost Model: Found an estimated cost of 3 for instruction: %select1 = select i1 %fcmp1, <2 x float> %a, <2 x float> %b
; SFB64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret <2 x float> %select1
;
; RV64-LABEL: 'fcmp-vector-fselect'
; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %fcmp1 = fcmp ogt float %ca, %cb
; RV64-NEXT: Cost Model: Found an estimated cost of 3 for instruction: %select1 = select i1 %fcmp1, <2 x float> %a, <2 x float> %b
; RV64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret <2 x float> %select1
;
%fcmp1 = fcmp ogt float %ca, %cb
%select1 = select i1 %fcmp1, <2 x float> %a, <2 x float> %b
ret <2 x float> %select1
}

define <2 x i32> @fcmp-vector-iselect(float %ca, float %cb, <2 x i32> %a, <2 x i32> %b) {
; SFB64-LABEL: 'fcmp-vector-iselect'
; SFB64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %fcmp1 = fcmp ogt float %ca, %cb
; SFB64-NEXT: Cost Model: Found an estimated cost of 3 for instruction: %select1 = select i1 %fcmp1, <2 x i32> %a, <2 x i32> %b
; SFB64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret <2 x i32> %select1
;
; RV64-LABEL: 'fcmp-vector-iselect'
; RV64-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %fcmp1 = fcmp ogt float %ca, %cb
; RV64-NEXT: Cost Model: Found an estimated cost of 3 for instruction: %select1 = select i1 %fcmp1, <2 x i32> %a, <2 x i32> %b
; RV64-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret <2 x i32> %select1
;
%fcmp1 = fcmp ogt float %ca, %cb
%select1 = select i1 %fcmp1, <2 x i32> %a, <2 x i32> %b
ret <2 x i32> %select1
}
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