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[AArch64] Add BF16 fpext and fptrunc costs. #119524

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Jan 7, 2025
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[AArch64] Add BF16 fpext and fptrunc costs. #119524

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32 changes: 32 additions & 0 deletions llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2763,6 +2763,21 @@ InstructionCost AArch64TTIImpl::getCastInstrCost(unsigned Opcode, Type *Dst,
return AdjustCost(
BaseT::getCastInstrCost(Opcode, Dst, Src, CCH, CostKind, I));

static const TypeConversionCostTblEntry BF16Tbl[] = {
{ISD::FP_ROUND, MVT::bf16, MVT::f32, 1}, // bfcvt
{ISD::FP_ROUND, MVT::bf16, MVT::f64, 1}, // bfcvt
{ISD::FP_ROUND, MVT::v4bf16, MVT::v4f32, 1}, // bfcvtn
{ISD::FP_ROUND, MVT::v8bf16, MVT::v8f32, 2}, // bfcvtn+bfcvtn2
{ISD::FP_ROUND, MVT::v2bf16, MVT::v2f64, 2}, // bfcvtn+fcvtn
{ISD::FP_ROUND, MVT::v4bf16, MVT::v4f64, 3}, // fcvtn+fcvtl2+bfcvtn
{ISD::FP_ROUND, MVT::v8bf16, MVT::v8f64, 6}, // 2 * fcvtn+fcvtn2+bfcvtn
};

if (ST->hasBF16())
if (const auto *Entry = ConvertCostTableLookup(
BF16Tbl, ISD, DstTy.getSimpleVT(), SrcTy.getSimpleVT()))
return AdjustCost(Entry->Cost);

static const TypeConversionCostTblEntry ConversionTbl[] = {
{ISD::TRUNCATE, MVT::v2i8, MVT::v2i64, 1}, // xtn
{ISD::TRUNCATE, MVT::v2i16, MVT::v2i64, 1}, // xtn
Expand Down Expand Up @@ -2850,6 +2865,14 @@ InstructionCost AArch64TTIImpl::getCastInstrCost(unsigned Opcode, Type *Dst,
{ISD::FP_EXTEND, MVT::v2f64, MVT::v2f16, 2}, // fcvtl+fcvtl
{ISD::FP_EXTEND, MVT::v4f64, MVT::v4f16, 3}, // fcvtl+fcvtl2+fcvtl
{ISD::FP_EXTEND, MVT::v8f64, MVT::v8f16, 6}, // 2 * fcvtl+fcvtl2+fcvtl
// BF16 (uses shift)
{ISD::FP_EXTEND, MVT::f32, MVT::bf16, 1}, // shl
{ISD::FP_EXTEND, MVT::f64, MVT::bf16, 2}, // shl+fcvt
{ISD::FP_EXTEND, MVT::v4f32, MVT::v4bf16, 1}, // shll
{ISD::FP_EXTEND, MVT::v8f32, MVT::v8bf16, 2}, // shll+shll2
{ISD::FP_EXTEND, MVT::v2f64, MVT::v2bf16, 2}, // shll+fcvtl
{ISD::FP_EXTEND, MVT::v4f64, MVT::v4bf16, 3}, // shll+fcvtl+fcvtl2
{ISD::FP_EXTEND, MVT::v8f64, MVT::v8bf16, 6}, // 2 * shll+fcvtl+fcvtl2
// FP Ext and trunc
{ISD::FP_ROUND, MVT::f32, MVT::f64, 1}, // fcvt
{ISD::FP_ROUND, MVT::v2f32, MVT::v2f64, 1}, // fcvtn
Expand All @@ -2862,6 +2885,15 @@ InstructionCost AArch64TTIImpl::getCastInstrCost(unsigned Opcode, Type *Dst,
{ISD::FP_ROUND, MVT::v2f16, MVT::v2f64, 2}, // fcvtn+fcvtn
{ISD::FP_ROUND, MVT::v4f16, MVT::v4f64, 3}, // fcvtn+fcvtn2+fcvtn
{ISD::FP_ROUND, MVT::v8f16, MVT::v8f64, 6}, // 2 * fcvtn+fcvtn2+fcvtn
// BF16 (more complex, with +bf16 is handled above)
{ISD::FP_ROUND, MVT::bf16, MVT::f32, 8}, // Expansion is ~8 insns
{ISD::FP_ROUND, MVT::bf16, MVT::f64, 9}, // fcvtn + above
{ISD::FP_ROUND, MVT::v2bf16, MVT::v2f32, 8},
{ISD::FP_ROUND, MVT::v4bf16, MVT::v4f32, 8},
{ISD::FP_ROUND, MVT::v8bf16, MVT::v8f32, 15},
{ISD::FP_ROUND, MVT::v2bf16, MVT::v2f64, 9},
{ISD::FP_ROUND, MVT::v4bf16, MVT::v4f64, 10},
{ISD::FP_ROUND, MVT::v8bf16, MVT::v8f64, 19},

// LowerVectorINT_TO_FP:
{ISD::SINT_TO_FP, MVT::v2f32, MVT::v2i32, 1},
Expand Down
68 changes: 46 additions & 22 deletions llvm/test/Analysis/CostModel/AArch64/cast.ll
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py
; RUN: opt -passes="print<cost-model>" 2>&1 -disable-output -mtriple=aarch64 %s | FileCheck --check-prefixes=CHECK,CHECK-NOFP16 %s
; RUN: opt -passes="print<cost-model>" 2>&1 -disable-output -mtriple=aarch64 -mattr=+fullfp16 %s | FileCheck --check-prefixes=CHECK,CHECK-FP16 %s
; RUN: opt -passes="print<cost-model>" 2>&1 -disable-output -mtriple=aarch64 -mattr=+fullfp16,+bf16 %s | FileCheck --check-prefixes=CHECK,CHECK-FP16,CHECK-BF16 %s

target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"

Expand Down Expand Up @@ -1237,28 +1238,51 @@ define void @fp16cast() {
}

define void @bf16cast() {
; CHECK-LABEL: 'bf16cast'
; CHECK-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %extf16f32 = fpext bfloat undef to float
; CHECK-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %extv2f16f32 = fpext <2 x bfloat> undef to <2 x float>
; CHECK-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %extv4f16f32 = fpext <4 x bfloat> undef to <4 x float>
; CHECK-NEXT: Cost Model: Found an estimated cost of 3 for instruction: %extv8f16f32 = fpext <8 x bfloat> undef to <8 x float>
; CHECK-NEXT: Cost Model: Found an estimated cost of 6 for instruction: %extv16f16f32 = fpext <16 x bfloat> undef to <16 x float>
; CHECK-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %extf16f64 = fpext bfloat undef to double
; CHECK-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %extv2f16f64 = fpext <2 x bfloat> undef to <2 x double>
; CHECK-NEXT: Cost Model: Found an estimated cost of 3 for instruction: %extv4f16f64 = fpext <4 x bfloat> undef to <4 x double>
; CHECK-NEXT: Cost Model: Found an estimated cost of 7 for instruction: %extv8f16f64 = fpext <8 x bfloat> undef to <8 x double>
; CHECK-NEXT: Cost Model: Found an estimated cost of 14 for instruction: %extv16f16f64 = fpext <16 x bfloat> undef to <16 x double>
; CHECK-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %truncf16f32 = fptrunc float undef to bfloat
; CHECK-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %truncv2f16f32 = fptrunc <2 x float> undef to <2 x bfloat>
; CHECK-NEXT: Cost Model: Found an estimated cost of 16 for instruction: %truncv4f16f32 = fptrunc <4 x float> undef to <4 x bfloat>
; CHECK-NEXT: Cost Model: Found an estimated cost of 33 for instruction: %truncv8f16f32 = fptrunc <8 x float> undef to <8 x bfloat>
; CHECK-NEXT: Cost Model: Found an estimated cost of 66 for instruction: %truncv16f16f32 = fptrunc <16 x float> undef to <16 x bfloat>
; CHECK-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %truncf16f64 = fptrunc double undef to bfloat
; CHECK-NEXT: Cost Model: Found an estimated cost of 6 for instruction: %truncv2f16f64 = fptrunc <2 x double> undef to <2 x bfloat>
; CHECK-NEXT: Cost Model: Found an estimated cost of 13 for instruction: %truncv4f16f64 = fptrunc <4 x double> undef to <4 x bfloat>
; CHECK-NEXT: Cost Model: Found an estimated cost of 27 for instruction: %truncv8f16f64 = fptrunc <8 x double> undef to <8 x bfloat>
; CHECK-NEXT: Cost Model: Found an estimated cost of 54 for instruction: %truncv16f16f64 = fptrunc <16 x double> undef to <16 x bfloat>
; CHECK-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret void
; CHECK-NOFP16-LABEL: 'bf16cast'
; CHECK-NOFP16-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %extf16f32 = fpext bfloat undef to float
; CHECK-NOFP16-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %extv2f16f32 = fpext <2 x bfloat> undef to <2 x float>
; CHECK-NOFP16-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %extv4f16f32 = fpext <4 x bfloat> undef to <4 x float>
; CHECK-NOFP16-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %extv8f16f32 = fpext <8 x bfloat> undef to <8 x float>
; CHECK-NOFP16-NEXT: Cost Model: Found an estimated cost of 4 for instruction: %extv16f16f32 = fpext <16 x bfloat> undef to <16 x float>
; CHECK-NOFP16-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %extf16f64 = fpext bfloat undef to double
; CHECK-NOFP16-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %extv2f16f64 = fpext <2 x bfloat> undef to <2 x double>
; CHECK-NOFP16-NEXT: Cost Model: Found an estimated cost of 3 for instruction: %extv4f16f64 = fpext <4 x bfloat> undef to <4 x double>
; CHECK-NOFP16-NEXT: Cost Model: Found an estimated cost of 6 for instruction: %extv8f16f64 = fpext <8 x bfloat> undef to <8 x double>
; CHECK-NOFP16-NEXT: Cost Model: Found an estimated cost of 12 for instruction: %extv16f16f64 = fpext <16 x bfloat> undef to <16 x double>
; CHECK-NOFP16-NEXT: Cost Model: Found an estimated cost of 8 for instruction: %truncf16f32 = fptrunc float undef to bfloat
; CHECK-NOFP16-NEXT: Cost Model: Found an estimated cost of 8 for instruction: %truncv2f16f32 = fptrunc <2 x float> undef to <2 x bfloat>
; CHECK-NOFP16-NEXT: Cost Model: Found an estimated cost of 8 for instruction: %truncv4f16f32 = fptrunc <4 x float> undef to <4 x bfloat>
; CHECK-NOFP16-NEXT: Cost Model: Found an estimated cost of 15 for instruction: %truncv8f16f32 = fptrunc <8 x float> undef to <8 x bfloat>
; CHECK-NOFP16-NEXT: Cost Model: Found an estimated cost of 30 for instruction: %truncv16f16f32 = fptrunc <16 x float> undef to <16 x bfloat>
; CHECK-NOFP16-NEXT: Cost Model: Found an estimated cost of 9 for instruction: %truncf16f64 = fptrunc double undef to bfloat
; CHECK-NOFP16-NEXT: Cost Model: Found an estimated cost of 9 for instruction: %truncv2f16f64 = fptrunc <2 x double> undef to <2 x bfloat>
; CHECK-NOFP16-NEXT: Cost Model: Found an estimated cost of 10 for instruction: %truncv4f16f64 = fptrunc <4 x double> undef to <4 x bfloat>
; CHECK-NOFP16-NEXT: Cost Model: Found an estimated cost of 19 for instruction: %truncv8f16f64 = fptrunc <8 x double> undef to <8 x bfloat>
; CHECK-NOFP16-NEXT: Cost Model: Found an estimated cost of 38 for instruction: %truncv16f16f64 = fptrunc <16 x double> undef to <16 x bfloat>
; CHECK-NOFP16-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret void
;
; CHECK-BF16-LABEL: 'bf16cast'
; CHECK-BF16-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %extf16f32 = fpext bfloat undef to float
; CHECK-BF16-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %extv2f16f32 = fpext <2 x bfloat> undef to <2 x float>
; CHECK-BF16-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %extv4f16f32 = fpext <4 x bfloat> undef to <4 x float>
; CHECK-BF16-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %extv8f16f32 = fpext <8 x bfloat> undef to <8 x float>
; CHECK-BF16-NEXT: Cost Model: Found an estimated cost of 4 for instruction: %extv16f16f32 = fpext <16 x bfloat> undef to <16 x float>
; CHECK-BF16-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %extf16f64 = fpext bfloat undef to double
; CHECK-BF16-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %extv2f16f64 = fpext <2 x bfloat> undef to <2 x double>
; CHECK-BF16-NEXT: Cost Model: Found an estimated cost of 3 for instruction: %extv4f16f64 = fpext <4 x bfloat> undef to <4 x double>
; CHECK-BF16-NEXT: Cost Model: Found an estimated cost of 6 for instruction: %extv8f16f64 = fpext <8 x bfloat> undef to <8 x double>
; CHECK-BF16-NEXT: Cost Model: Found an estimated cost of 12 for instruction: %extv16f16f64 = fpext <16 x bfloat> undef to <16 x double>
; CHECK-BF16-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %truncf16f32 = fptrunc float undef to bfloat
; CHECK-BF16-NEXT: Cost Model: Found an estimated cost of 8 for instruction: %truncv2f16f32 = fptrunc <2 x float> undef to <2 x bfloat>
; CHECK-BF16-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %truncv4f16f32 = fptrunc <4 x float> undef to <4 x bfloat>
; CHECK-BF16-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %truncv8f16f32 = fptrunc <8 x float> undef to <8 x bfloat>
; CHECK-BF16-NEXT: Cost Model: Found an estimated cost of 4 for instruction: %truncv16f16f32 = fptrunc <16 x float> undef to <16 x bfloat>
; CHECK-BF16-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %truncf16f64 = fptrunc double undef to bfloat
; CHECK-BF16-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %truncv2f16f64 = fptrunc <2 x double> undef to <2 x bfloat>
; CHECK-BF16-NEXT: Cost Model: Found an estimated cost of 3 for instruction: %truncv4f16f64 = fptrunc <4 x double> undef to <4 x bfloat>
; CHECK-BF16-NEXT: Cost Model: Found an estimated cost of 6 for instruction: %truncv8f16f64 = fptrunc <8 x double> undef to <8 x bfloat>
; CHECK-BF16-NEXT: Cost Model: Found an estimated cost of 12 for instruction: %truncv16f16f64 = fptrunc <16 x double> undef to <16 x bfloat>
; CHECK-BF16-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret void
;
%extf16f32 = fpext bfloat undef to float
%extv2f16f32 = fpext <2 x bfloat> undef to <2 x float>
Expand Down
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