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c_update.cxx
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/*******************************************************************************
* Copyright 2019-2025 Intel Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*******************************************************************************/
#include <numeric>
#include "alloc_utils.hpp"
#include "generator.hpp"
#include "hw_utils.hpp"
#include "kernel_queries.hpp"
#include "layout_utils.hpp"
#include "ngen_object_helpers.hpp"
#include "state_utils.hpp"
using namespace ngen;
using namespace ngen::utils;
using std::vector;
#include "internal/namespace_start.hxx"
// Decide whether to use the legacy post-op injector inside C update.
// Needed if we can't convert C to f32 in-place, but doesn't support binary post-ops.
static inline bool useEltwiseInjector(const GEMMProblem &problem)
{
return problem.hasNonSum1PostOp() && (problem.Tc.paddedSize() < 4);
}
// Main entrypoint for the C matrix update step.
template <HW hw>
bool BLASKernelGenerator<hw>::gemmUpdateC(GEMMProblem &problem, GEMMStrategy &strategy, GEMMState &state)
{
auto Tc = problem.Tc;
auto Tco = problem.Tco;
auto Ts = problem.Ts;
status << "C update" << status_stream::endl;
auto &beta = problem.beta;
if (strategy.fuseBeta && !strategy.altFusedBeta && !strategy.fusePostOps && !strategy.kParallelVariable)
beta = 1;
else if (strategy.cLoadAhead) {
beta = 0;
if (!problem.alpha1())
stub();
}
// C early offset.
if (problem.cOffset == COffset::Pre) {
if (Tc.isInteger() && Tco.isFP() && Ts.isFP()) {
if (!gemmConvertC(Ts, problem, strategy, state))
return false;
} else if (Tc.isInteger() ^ Tco.isInteger()) {
// It's unclear what data type to accumulate in for this scenario.
stub();
}
if (!gemmApplyCOffsetDispatch(problem, strategy, state)) return false;
}
// Prepare legacy eltwise postop injector if configured.
GRFRange postOpScratch;
if (useEltwiseInjector(problem)) {
if (problem.hasBinaryPostOp()) stub();
const int eu_count = 0;
postOpInjector.reset(new Injector(this, problem.Ts.get_dnnl_type(), problem.postOps, eu_count, GRFRange(), problem.postOpFwd));
if (!postOpInjector) stub();
postOpScratch = state.ra.try_alloc_range(postOpInjector->preferred_scratch_regs());
if (postOpScratch.isInvalid())
postOpScratch = state.ra.alloc_range(postOpInjector->min_scratch_regs());
postOpInjector->set_scratch(postOpScratch);
}
// Convert C to the type of alpha/beta if needed and if possible (no data size change).
// If not possible, must be done at a lower level during C update.
bool successfulConvert = true;
if (problem.needsTsConvert())
successfulConvert = gemmConvertC(Ts, problem, strategy, state);
// Scale by alpha now if alpha and beta are both nontrivial. Todo: move above beta = 0 check,
// handle double precision correctly (load alpha to register first).
// Also scale if atomically updating C or for split-complex.
bool nontrivialAlpha = !problem.alpha1() && !problem.alphaM1();
bool forceScale = !problem.alpha1() && strategy.C.atomic;
if (!problem.alpha1() && problem.hasBinaryPostOp()) {
forceScale = true;
if (!successfulConvert) stub();
}
if (successfulConvert && ((nontrivialAlpha && (!problem.beta1() || strategy.doubleWA)) || forceScale)) {
gemmAlphaScale(problem, strategy, state);
}
// Do the actual updating.
if (!gemmAccessC(COperation::UpdateStore, problem, strategy, state))
return false;
// Postop cleanup.
if (useEltwiseInjector(problem)) {
postOpInjector.reset();
state.ra.safeRelease(postOpScratch);
}
// Free C data and layout.
safeReleaseRanges(state.C_regs, state);
state.C_layout.clear();
state.C_layoutExt.clear();
state.raVFlag.safeRelease(state.flagSwizzle);
// Free A/B sum data and layouts.
safeReleaseRanges(state.As_regs, state);
safeReleaseRanges(state.Bs_regs, state);
state.As_layout.clear();
state.Bs_layout.clear();
// Success!
return true;
}
// Load from, update, and/or store to C, with complete remainder handling.
// If op == COperation::Load, only load C.
// If op == COperation::Update, load and update C.
// If op == COperation::UpdateStore, perform full C update with alpha/beta scaling. Unless state.isNested == true, assumed
// to be the conclusion of the kernel.
// If op == COperation::Store, only store C.
template <HW hw>
bool BLASKernelGenerator<hw>::gemmAccessC(COperation op, const GEMMProblem &problem, const GEMMStrategy &strategy, GEMMState &state)
{
Label labelStdCRemainder, labelAltCRemainder, labelBlock2DCRemainder, labelCRemDone, labelSkip;
if (op == COperation::Store) {
auto modProblem = problem;
modProblem.alpha = 1;
modProblem.beta = 0;
modProblem.postOps = gpu_post_ops_t{};
modProblem.cOffset = COffset::None;
return gemmAccessC(COperation::UpdateStore, modProblem, strategy, state);
}
gemmAccessSums(op, problem, strategy, state);
int C_count = (op == COperation::UpdateStore) ? state.C_count : 1;
bool remainderM = (strategy.remHandling[LoopM] != RemainderHandling::Ignore);
bool remainderN = (strategy.remHandling[LoopN] != RemainderHandling::Ignore);
bool remM_C, remN_C;
getCRemainders(hw, problem, strategy, remM_C, remN_C);
bool block2DCRemainder = strategy.block2DCRemainder && !strategy.C.padded && (remainderM || remainderN);
bool block2DCFull = strategy.block2DCFull && !isPacked(problem.C.layout);
block2DCRemainder |= block2DCFull;
block2DCRemainder &= !strategy.C.atomic;
block2DCFull &= !strategy.C.atomic;
bool altCRemainder = strategy.altCRemainder && !strategy.C.padded && (remainderM || remainderN || problem.gemmt());
bool stdCRemainder = !(altCRemainder && (strategy.remHandling[LoopM] == RemainderHandling::KnownRemainder)
&& (strategy.remHandling[LoopN] == RemainderHandling::KnownRemainder));
if ((op != COperation::UpdateStore) && strategy.C.atomic) stub();
if (state.allowEmptyC && (remainderM || remainderN)) {
if (!state.isNested) stub();
int simt = strategy.fused ? 16 : 1;
InstructionModifier mod;
if (remainderM) cmp(simt | le | f0[0], null.ud(), state.remainders[LoopM], 0);
if (remainderN) cmp(simt | le | f1[0], null.ud(), state.remainders[LoopN], 0);
if (remainderM && remainderN)
mod = mod | f0[0] | anyv;
else if (remainderM)
mod = mod | f0[0];
else if (remainderN)
mod = mod | f1[0];
strategy.fused ? goto12(16 | mod, labelSkip)
: ejmpi(1 | mod, labelSkip);
}
bool splitUpdateStore = (problem.cOffset == COffset::Post);
// New post-op path: do all post-ops up to sum, if any.
size_t poSum = 0;
bool newPostOps = !useEltwiseInjector(problem);
if (op == COperation::UpdateStore && newPostOps) {
for (poSum = 0; poSum < problem.postOps.len(); poSum++)
if (problem.postOps[poSum].is_sum())
break;
gemmApplyPostOps(0, poSum, problem, strategy, state);
splitUpdateStore |= (poSum + 1 < problem.postOps.len());
}
if (op == COperation::UpdateStore && splitUpdateStore) {
// C postoffset is implemented by splitting the update and store steps.
bool ok = true;
bool oldAllowEmptyC = state.allowEmptyC;
state.allowEmptyC = false;
if (!(problem.alpha1() && problem.beta0()))
ok = ok && gemmAccessC(COperation::Update, problem, strategy, state);
auto storeProblem = problem;
storeProblem.cOffset = COffset::None;
storeProblem.alpha = 1;
storeProblem.beta = 0;
// Do any post-sum post-ops.
if (newPostOps)
gemmApplyPostOps(poSum + 1, problem.postOps.len(), problem, strategy, state);
storeProblem.postOps = gpu_post_ops_t{};
if (problem.cOffset == COffset::Post)
ok = ok && gemmApplyCOffsetDispatch(problem, strategy, state);
ok = ok && gemmAccessC(COperation::UpdateStore, storeProblem, strategy, state);
state.allowEmptyC = oldAllowEmptyC;
if (ok && state.allowEmptyC && (remainderM || remainderN)) {
mark(labelSkip);
if (strategy.fused) join(16);
}
return ok;
}
auto leave = [&] {
if (state.isNested || (op != COperation::UpdateStore))
jmpi(1, labelCRemDone);
else
epilogue(strategy, state);
};
if (stdCRemainder) {
// Check to see if we should jump to alternate C remainder handling path, when enabled:
// - if this a remainder kernel
// - for triangular updates, if the diagonal crosses this block.
// When fusing, check diagonal for thread 0 for (fused in n) upper/m lower, thread 1 for n lower/m upper.
if (block2DCFull)
jmpi(1, labelBlock2DCRemainder);
else if (altCRemainder || block2DCRemainder) {
if (remainderM) cmp(1 | lt | f0[0], null.ud(), state.remaindersFused[LoopM], strategy.unroll[LoopM]);
if (remainderN) cmp(1 | lt | f1[0], null.ud(), state.remaindersFused[LoopN], strategy.unroll[LoopN]);
auto &remLabel = block2DCRemainder ? labelBlock2DCRemainder : labelAltCRemainder;
if (remainderM && remainderN)
ejmpi(1 | f0[0] | anyv, remLabel);
else if (remainderM)
jmpi(1 | f0[0], remLabel);
else if (remainderN)
jmpi(1 | f1[0], remLabel);
}
if (block2DCRemainder && !altCRemainder)
mark(labelStdCRemainder);
// Release the all-purpose flag temporarily to free up flag registers if it won't be needed.
auto saveFlagAP = state.flagAP;
if (!problem.hasPostOp())
if (!strategy.fused && !strategy.noJumpTables && state.emulate.flag != state.flagAP)
state.raVFlag.safeRelease(state.flagAP);
// Decide on the C remainder handling strategy.
bool fragments[2] = {false, false};
bool fragPositives[2] = {true, true};
int fragSizes[2] = {1 << 16, 1 << 16};
// Check for fragmenting.
bool useNonatomic = !(state.C_layoutExtNonatomicUnmasked.empty() || strategy.C.atomic);
auto &C_layoutExt = state.C_layoutExt;
auto &C_layoutExtUnmasked = useNonatomic ? state.C_layoutExtNonatomicUnmasked
: state.C_layoutExtUnmasked;
bool remDescs[2] = {false, false};
bool remMasks[2] = {false, false};
// Loop over rows (rc = 0) and columns (rc = 1).
for (int rc = 0; rc < 2; rc++) {
if (!(rc ? remN_C : remM_C)) continue; // Skip if not doing remainder handling in this dimension.
for (auto &l : C_layoutExt) {
auto qFragment = rc ? l.colFragment : l.rowFragment;
bool qZeroOK = rc ? l.noColsOK : l.noRowsOK;
bool qMasked = rc ? (bool) l.colMask : (bool) l.rowMask;
bool qDescRem = rc ? l.descRemC : l.descRemR;
if (qFragment > 0) {
fragments[rc] = true;
fragSizes[rc] = std::min<int>(fragSizes[rc], qFragment);
if (qZeroOK) fragPositives[rc] = false;
if (qFragment > 1) {
remDescs[rc] |= qDescRem;
remMasks[rc] |= !qDescRem;
}
} else
remMasks[rc] |= qMasked;
}
}
// Disable fragmentation if fragment size is bigger than unroll.
fragments[0] &= fragSizes[0] < strategy.unroll[LoopM];
fragments[1] &= fragSizes[1] < strategy.unroll[LoopN];
// Sanity check the requirements.
if ((remDescs[0] && remMasks[0]) || (remDescs[1] && remMasks[1])) {
status << "Different remainder types mixed in C layout." << status_stream::endl;
return false;
}
if (remMasks[0] && remMasks[1]) {
status << "Both dimensions are masked (not supported)." << status_stream::endl;
return false;
}
if (remDescs[0] && remDescs[1]) {
status << "Both dimensions use descriptors (not supported)." << status_stream::endl;
return false;
}
// Set remainder handling types.
StdCRemType remTypes[2] = {StdCRemType::Ignore, StdCRemType::Ignore};
for (int rc = 0; rc < 2; rc++) {
if (remDescs[rc]) remTypes[rc] = StdCRemType::Descriptor;
else if (remMasks[rc]) remTypes[rc] = StdCRemType::Mask;
}
// Decide whether to do m or n first. Criteria, in order of priority:
// - Do an ignored dimension first.
// - Do a fragmented dimension first.
// - Do descriptors first.
// - Do whichever dimension of C is strided first.
bool nFirst;
if (remTypes[0] == StdCRemType::Ignore || remTypes[1] == StdCRemType::Ignore)
nFirst = (remTypes[1] == StdCRemType::Ignore);
else if (fragments[0] != fragments[1])
nFirst = fragments[1];
else if (remDescs[0] || remDescs[1])
nFirst = remDescs[1];
else
nFirst = (problem.C.layout == MatrixLayout::N);
// Cache ldc multiples.
gemmCacheLDCMultiples(problem, strategy, state);
// Prepare for load/store descriptor generation.
if (remDescs[0] || remDescs[1])
setupTeardownLoadStoreDesc(true, C_layoutExt, strategy, state);
// Set up address for the beginning of C.
GRFRange C_addr0[2], C_addr0Unmasked[2];
setupCAddr0(C_addr0, C_addr0Unmasked, C_layoutExt, C_layoutExtUnmasked, C_count, problem, strategy, state);
// Try to load C masks. If that fails, fragment the masked dimension down to the size of current blocks.
vector<MaskAssignment> masks;
if (!assignMasks(C_layoutExt, LoopM, LoopN, masks, strategy, state)) {
for (int rc = 0; rc < 2; rc++) {
if (remMasks[rc]) {
fragments[rc] = true;
fragSizes[rc] = rc ? C_layoutExt[0].nc : C_layoutExt[0].nr;
}
}
} else
loadMasks(masks, state.remainders, strategy, state);
// Call the remainder handling routine. If it fails, try again, switching M and N.
// If that still fails, then try again with complete fragmentation if partial
// fragmentation attempted the first time.
bool columns[2] = {nFirst, !nFirst};
bool switchedColumns[2] = {!nFirst, nFirst};
do {
if (doStdCRemainder(C_layoutExt, C_layoutExtUnmasked, false, columns, remTypes, fragments, fragPositives, fragSizes, C_addr0, C_addr0Unmasked, op, masks, problem, strategy, state)) break;
if (doStdCRemainder(C_layoutExt, C_layoutExtUnmasked, false, switchedColumns, remTypes, fragments, fragPositives, fragSizes, C_addr0, C_addr0Unmasked, op, masks, problem, strategy, state)) break;
if ((fragments[0] && (fragSizes[0] > 1)) || (fragments[1] && (fragSizes[1] > 1))) {
fragSizes[0] = fragSizes[1] = 1;
if (doStdCRemainder(C_layoutExt, C_layoutExtUnmasked, false, columns, remTypes, fragments, fragPositives, fragSizes, C_addr0, C_addr0Unmasked, op, masks, problem, strategy, state)) break;
if (doStdCRemainder(C_layoutExt, C_layoutExtUnmasked, false, switchedColumns, remTypes, fragments, fragPositives, fragSizes, C_addr0, C_addr0Unmasked, op, masks, problem, strategy, state)) break;
}
return false;
} while (false);
// Free cached ldc multiples.
for (int q = 0; q < state.C_count; q++)
releaseLDMultiples(state.ldcMultiples[q], state);
releaseIndexVec(state);
// Free address header for block 0.
for (int q = 0; q < C_count; q++)
state.ra.safeRelease(C_addr0[q]);
// Free C mask registers.
safeReleaseMaskAssignments(masks, state);
for (auto &block: C_layoutExt)
block.clearFlag();
// Clean up after load/store descriptor generation.
if (remDescs[0] || remDescs[1])
setupTeardownLoadStoreDesc(false, C_layoutExt, strategy, state);
// Restore all-purpose flag.
state.flagAP = saveFlagAP;
state.raVFlag.claim(saveFlagAP);
// Leave.
if (block2DCRemainder || altCRemainder)
leave();
}
// Do block 2D C remainder handling if enabled.
if (block2DCRemainder) {
mark(labelBlock2DCRemainder);
// Check for transposition.
bool doTranspose = isTransposing(strategy.C.accessType);
// Check if alignment requirements are met, and stride fits in 24 bits.
auto Tc = problem.Tc, Tc_ext = problem.Tc_ext;
uint16_t align = block2DMinAlignment(hw, problem.C, strategy.C, true);
for (int q = 0; q < state.C_count; q++) {
bool checkAlign = (problem.C.alignment % align) != 0;
bool checkWidth = (q == 0 && Tc_ext.paddedSize() < 4 && op != COperation::Load);
auto &labelNonBlock2DRem = altCRemainder ? labelAltCRemainder : labelStdCRemainder;
if (checkAlign) {
and_(1 | nz | f0[0], null.uw(), state.effC[q].uw(), align - 1);
and_(1 | nz | f1[0], null.uw(), state.inputs.ldc[q].uw(), align - 1);
}
if (checkWidth)
and_(1 | nz | f0[1], null.uw(), state.remainders[isColMajor(problem.C.layout) ? LoopM : LoopN], (4 / Tc_ext) - 1);
and_(1 | nz | f1[1], null.ud(), state.inputs.ldc[q], 0xFF000000);
if (checkAlign)
ejmpi(1 | f0[0] | anyv, labelNonBlock2DRem);
if (checkWidth)
jmpi(1 | f0[1], labelNonBlock2DRem);
jmpi(1 | f1[1], labelNonBlock2DRem);
}
status << "2D block C remainder handling (m/n)" << status_stream::endl;
// Rustle up a new layout.
// Match existing C layout if possible and deemed worthwhile.
vector<RegisterBlock> C_layout2D;
auto modProblem = problem;
auto modStrategy = strategy;
auto modState = state;
modProblem.C.setAlignment(align);
modStrategy.C = state.Cext_strategy;
modStrategy.C.newDP = true;
modStrategy.C.address2D = true;
modStrategy.C.accessType = doTranspose ? AccessType::Block2DTranspose : AccessType::Block2D;
auto &C_layout = modState.C_layout;
auto &C_layoutExt = modState.C_layoutExt;
auto &C_layoutExtUnmasked = modState.C_layoutExtUnmasked;
bool inplace = (Tc == Tc_ext) && upgradeLayoutToBlock2D(Tc, C_layout, C_layout2D, remM_C, remN_C, op != COperation::Load, modProblem.C, modStrategy.C);
for (auto &block: C_layout2D)
inplace = inplace && state.C_regs[0].contiguous(block.offsetReg(), block.nregs());
modState.copyC = !inplace;
if (inplace)
C_layoutExt = std::move(C_layout2D);
else
if (!getRegLayout(Tc_ext, C_layoutExt, strategy.unroll[LoopM], strategy.unroll[LoopN], remM_C, remN_C, true, AllowFragDesc, 0, 0, modProblem.C, modStrategy.C)) stub();
C_layoutExtUnmasked.clear();
unlinkFromMemory(C_layout);
// Do the update.
Address2DParams params;
params.rows = state.remainders[LoopM];
params.cols = state.remainders[LoopN];
GRFRange C_addr0[2], C_addr0Unmasked[2];
setupCAddr0(C_addr0, C_addr0Unmasked, C_layoutExt, C_layoutExtUnmasked, C_count, modProblem, modStrategy, modState, ¶ms);
bool columns[2] = {false, true};
StdCRemType remTypes[2] = {StdCRemType::Ignore, StdCRemType::Ignore};
bool fragments[2] = {false, false};
bool fragPositives[2] = {false, false};
int fragSizes[2] = {1 << 16, 1 << 16};
vector<MaskAssignment> masks;
if (!doStdCRemainder(C_layoutExt, C_layoutExtUnmasked, false, columns, remTypes, fragments, fragPositives, fragSizes, C_addr0, C_addr0Unmasked, op, masks, modProblem, modStrategy, modState)) stub();
if (altCRemainder)
leave();
}
// Do alternate C remainder handling if enabled.
if (altCRemainder) {
mark(labelAltCRemainder);
doAlternateCRemainder(op, problem, strategy, state);
}
if (altCRemainder || block2DCRemainder)
mark(labelCRemDone);
if (state.allowEmptyC && (remainderM || remainderN)) {
mark(labelSkip);
if (strategy.fused) join(16);
}
return true; /* Successful! */
}
// Update C. If configured, choose between regular beta and beta = 0 or beta = 1 updates now.
template <HW hw>
bool BLASKernelGenerator<hw>::gemmUpdateCDispatch(GEMMProblem &problem, GEMMStrategy &strategy, GEMMState &state)
{
auto &beta = problem.beta;
auto vbetar = state.inputs.beta_real;
// Decide if we need to create special paths for beta = 0 or beta = 1 cases.
bool checkBeta0 = problem.checkBeta0 && !beta.fixed();
bool checkBeta1 = strategy.checkBeta1 && !beta.fixed();
bool checkTRMMBeta1 = state.beta1.isValid();
bool fuseCheckBeta0 = false;
bool fuseCheckBeta1 = false;
bool oldNested = state.isNested;
if (strategy.fuseBeta && strategy.altFusedBeta)
state.isNested = true;
if (strategy.fusePostOps) {
if (!state.useTempC) {
fuseCheckBeta0 |= strategy.kParallelVariable;
checkBeta0 |= fuseCheckBeta0;
}
} else if (strategy.fuseBeta) {
if (strategy.kParallelVariable || strategy.altFusedBeta) {
fuseCheckBeta1 = !problem.beta1();
checkBeta1 |= fuseCheckBeta1;
} else
checkBeta0 = checkBeta1 = false;
}
if (checkTRMMBeta1 && (checkBeta0 || checkBeta1)) stub();
// Decide if we need special paths for L1-uncached/cached cases.
bool checkUC = strategy.altFusedBeta && strategy.kParallelVariable && !strategy.fusePostOps && strategy.C.newDP;
auto C_l1UCW = makeL1Uncacheable(strategy.C.cachingW);
auto Ce_l1UCW = makeL1Uncacheable(state.Cext_strategy.cachingW);
checkUC = checkUC && (C_l1UCW != strategy.C.cachingW || Ce_l1UCW != state.Cext_strategy.cachingW);
if (strategy.altFusedBeta && !checkUC && !strategy.fusePostOps) {
strategy.C.cachingW = C_l1UCW;
state.Cext_strategy.cachingW = Ce_l1UCW;
}
// Generate the various paths needed.
if (!checkBeta0 && !checkBeta1 && !checkTRMMBeta1 && !checkUC) {
if (!gemmUpdateC(problem, strategy, state)) return false;
} else {
Label labelBeta0, labelBeta1, labelCached, labelBeta0Cached, labelBetaDone;
InstructionModifier mod0 = 1 | f0[0];
InstructionModifier mod1 = 1 | f0[1];
InstructionModifier modC = 1 | f1[0];
bool simtCF1 = false;
if (checkUC)
and_(1 | ze | f1[0], null.ud(), state.inputs.flags, FlagKPartitioned);
if (checkBeta1 && !beta.fixed()) {
cmp(1 | eq | f0[1], vbetar.getReg(0), cast(problem.Ts, 1.0));
}
if (checkBeta0 && !beta.fixed()) {
cmp0(1 | eq | f0[0], vbetar.getReg(0));
}
if (fuseCheckBeta1) {
if (strategy.altFusedBeta) {
auto mod = beta.fixed() ? (1 | ze | f0[1])
: (1 | ~f0[1] | ze | f0[1]);
if (strategy.kParallelVariable && !checkUC) {
auto temp = state.ra.alloc_sub<uint32_t>();
xor_(1, temp, state.inputs.flags, FlagKPartitioned);
and_(mod, null.ud(), temp, FlagDidBeta | FlagKPartitioned);
state.ra.safeRelease(temp);
} else
and_(mod, null.ud(), state.inputs.flags, FlagDidBeta);
} else if (strategy.kParallelVariable) {
auto mod = beta.fixed() ? (1 | nz | f0[1])
: (1 | ~f0[1] | nz | f0[1]);
and_(mod, null.ud(), state.inputs.flags, FlagKPartitioned);
}
}
if (fuseCheckBeta0) {
auto mod = beta.fixed() ? (1 | nz | f0[0])
: (1 | ~f0[0] | nz | f0[0]);
and_(mod, null.ud(), state.inputs.flags, FlagKPartitioned);
}
if (checkUC)
jmpi(modC, labelCached);
if (checkBeta0 && !fuseCheckBeta1)
jmpi(mod0, labelBeta0);
if (checkBeta1 || checkTRMMBeta1) {
simtCF1 ? if_(mod1, labelBeta1, labelBetaDone)
: jmpi(mod1, labelBeta1);
}
if (checkBeta0 && fuseCheckBeta1)
jmpi(mod0, labelBeta0);
// Regular update.
{
auto subproblem = problem;
auto substrategy = strategy;
auto substate = state;
if (strategy.C.atomic && !strategy.C.base.isStateless() && !strategy.C.newDP)
stub(); /* need to shift addresses */
substrategy.C.atomic = substrategy.CO.atomic = false;
substate.Cext_strategy.atomic = false;
if (checkUC) {
substrategy.C.cachingW = C_l1UCW;
substate.Cext_strategy.cachingW = Ce_l1UCW;
}
if (!gemmUpdateC(subproblem, substrategy, substate)) return false;
}
simtCF1 ? else_(16, labelBetaDone) :
state.isNested ? jmpi(1, labelBetaDone)
: epilogue(strategy, state);
// beta = 1 update.
if (checkBeta1 || checkTRMMBeta1) {
status << "Special path: beta = 1" << status_stream::endl;
mark(labelBeta1);
auto subproblem = problem;
auto substate = state;
subproblem.beta = 1;
if (subproblem.postOps.len() > 0) {
auto &lastPO = subproblem.postOps[subproblem.postOps.len() - 1];
if (lastPO.is_sum()) lastPO.set_scale(1.0f);
}
if (!gemmUpdateC(subproblem, strategy, substate)) return false;
if (checkBeta0) {
(simtCF1 || state.isNested) ? jmpi(1, labelBetaDone)
: epilogue(strategy, state);
}
}
// beta = 0 update.
if (checkBeta0) {
status << "Special path: beta = 0" << status_stream::endl;
mark(labelBeta0);
auto subproblem = problem;
auto substrategy = strategy;
auto substate = state;
subproblem.beta = 0;
subproblem.removeFinalSumPostOp();
if (checkUC) {
substrategy.C.cachingW = C_l1UCW;
substate.Cext_strategy.cachingW = Ce_l1UCW;
}
substrategy.C.atomic = substrategy.CO.atomic = false;
substate.Cext_strategy.atomic = false;
if (!gemmUpdateC(subproblem, substrategy, substate)) return false;
}
// Updates with L1 caching enabled for non-k-sliced tiles.
if (checkUC) {
state.isNested ? jmpi(1, labelBetaDone)
: epilogue(strategy, state);
status << "Special path: L1 caching enabled" << status_stream::endl;
mark(labelCached);
if (checkBeta0) jmpi(mod0, labelBeta0Cached);
{
auto subproblem = problem;
auto substrategy = strategy;
auto substate = state;
substrategy.C.atomic = substrategy.CO.atomic = false;
substate.Cext_strategy.atomic = false;
if (!gemmUpdateC(subproblem, substrategy, substate)) return false;
}
if (checkBeta0) {
state.isNested ? jmpi(1, labelBetaDone)
: epilogue(strategy, state);
status << "Special path: beta = 0, L1 caching enabled" << status_stream::endl;
mark(labelBeta0Cached);
auto subproblem = problem;
auto substrategy = strategy;
auto substate = state;
subproblem.beta = 0;
subproblem.removeFinalSumPostOp();
substrategy.C.atomic = substrategy.CO.atomic = false;
substate.Cext_strategy.atomic = false;
if (!gemmUpdateC(subproblem, substrategy, substate)) return false;
}
}
mark(labelBetaDone);
if (simtCF1) endif(16);
}
// Cleanup.
state.isNested = oldNested;
return true;
}
// Perform C update operation on C_acc, given original C data in C_load.
// All inputs and outputs are assumed to be of type problem.Ts.
template <HW hw>
void BLASKernelGenerator<hw>::updateC(const GRFMultirange &C_acc, const GRFMultirange &C_accSwap, const GRFMultirange &C_load,
const GEMMProblem &problem, const GEMMStrategy &strategy, GEMMState &state)
{
auto Ts = problem.Ts;
auto &alpha = problem.alpha;
auto &beta = problem.beta;
auto valphar = state.inputs.alpha_real;
auto vbetar = state.inputs.beta_real;
bool alpha1 = (alpha == 1);
bool alphaM1 = (alpha == -1);
bool beta1 = (beta == 1);
bool beta0 = (beta == 0);
bool betaM1 = (beta == -1);
#define FOR_EACH_C(f) do { \
map(hw, state.Tacc.real(), C_load, C_acc, strategy, [&](int esize, GRF loaded, GRF acc) { \
f; \
}); \
} while (false)
#define FOR_EACH_C_CX(f) do { \
map(hw, state.Tacc.real(), C_load, C_acc, C_accSwap, strategy, [&](int esize, GRF loaded, GRF acc, GRF accswap) { \
f; \
}); \
} while (false)
if (!beta0) {
if (alpha1 || alphaM1) {
if (beta1)
FOR_EACH_C(add(esize, acc, loaded, alpha1 ? acc : -acc));
else if (betaM1)
FOR_EACH_C(add(esize, acc, -loaded, alpha1 ? acc : -acc));
else if (beta.fixed())
stub(); // beta should be put in a register first.
else {
if (!strategy.doubleWA)
FOR_EACH_C(mad(esize, acc, alpha1 ? acc : -acc, loaded, vbetar.getRegAvoiding(hw, loaded)));
else {
FOR_EACH_C(mul(esize, loaded, loaded, vbetar.getRegAvoiding(hw, loaded)));
FOR_EACH_C(add(esize, acc, loaded, alpha1 ? acc : -acc));
}
}
} else {
bool neg = false;
if (!beta1) {
if (betaM1)
neg = true;
else if (!beta.fixed() && !Ts.isComplex())
FOR_EACH_C(mul(esize, loaded, loaded, vbetar.getRegAvoiding(hw, acc)));
else
stub();
}
if (alpha.fixed())
stub(); // alpha should be put in a register first.
else {
if (!strategy.doubleWA)
FOR_EACH_C(mad(esize, acc, neg ? -loaded : loaded, acc, valphar.getRegAvoiding(hw, acc)));
else {
FOR_EACH_C(mul(esize, acc, acc, valphar.getRegAvoiding(hw, acc)));
FOR_EACH_C(add(esize, acc, neg ? -loaded : loaded, acc));
}
}
}
} else if (alphaM1)
FOR_EACH_C(mov(esize, acc, -acc));
else if (alpha1)
/* no op */;
else if (alpha.fixed())
stub(); // alpha should be put in a register first.
else {
FOR_EACH_C(mul(esize, acc, acc, valphar.getRegAvoiding(hw, acc)));
}
if (useEltwiseInjector(problem)) {
Label labelPostOpDone;
bool allocFlag = state.flagAP.isInvalid();
auto flagNonfinal = allocFlag ? state.raVFlag.alloc() : state.flagAP;
and_(1 | nz | flagNonfinal, null.ud(), state.inputs.flags,
FlagNonfinalKBlock);
jmpi(1 | flagNonfinal, labelPostOpDone);
if (allocFlag)
state.raVFlag.safeRelease(flagNonfinal);
if (state.Tacc != Type::f32 || !postOpInjector) stub();
for (const auto &range: C_acc.ranges)
postOpInjector->compute(range);
mark(labelPostOpDone);
}
#undef FOR_EACH_C
#undef FOR_EACH_C_CX
}
static inline void getDefaultCParams(Address2DParams ¶ms, GEMMState &state)
{
params.rows = state.inputs.m;
params.cols = state.inputs.n;
params.offR = state.i0;
params.offC = state.j0;
params.remR = state.remainders[LoopM];
params.remC = state.remainders[LoopN];
}
// Update an entire C layout.
template <HW hw>
void BLASKernelGenerator<hw>::updateCLayout(const vector<RegisterBlock> &layoutExt, const GRFRange (&C_addr0)[2],
const RegisterBlock &C_block0, COperation op,
const GEMMProblem &problem, const GEMMStrategy &strategy, GEMMState &state)
{
#define FOR_EACH_C for (int q = 0; q < C_count; q++)
auto Tc = problem.Tc, Tc_ext = problem.Tc_ext, Ts = problem.Ts;
bool loadOnly = (op == COperation::Load);
bool beta0 = problem.beta0();
bool needLoad = (!beta0 && !loadOnly);
bool copyC = state.copyC;
int C_count = (op == COperation::UpdateStore) ? state.C_count : 1;
auto nblocks = int(layoutExt.size());
bool haveDescs = layoutExt[0].descAssigned;
vector<GRFRange> (&C_addrs)[2] = state.C_addrs;
GRFMultirange C_extRange, C_copyRange;
GRFMultirange &C_accRange = state.C_regs[0];
auto &C_extRegs = C_extRange.ranges;
auto &C_copyRegs = C_copyRange.ranges;
vector<GRFRange> C_convertRegs;
FOR_EACH_C C_addrs[q].clear();
// Map layout to blocks in internal C layout as needed.
vector<RegisterBlock> layout;
vector<int> blockMap;
if (copyC) {
if (!reblockLayout(Tc, blockMap, layout, layoutExt, state.C_layout, problem.C, strategy.C)) stub();
} else {
layout = layoutExt;
blockMap.resize(nblocks + 1);
for (int i = 0; i <= nblocks; i++)
blockMap[i] = i;
}
// Prepare for late C conversion.
bool lateCConvert = (!loadOnly && !strategy.C.atomic && problem.needsTsConvert() && state.Tacc != Ts);
bool copyCLoad = needLoad && (copyC || lateCConvert);
if (lateCConvert && Tc.isComplex()) stub();
// Load as much of C as is possible at a time, given register space.
for (int lstart = 0; lstart < nblocks;) {
int lend;
// Allocate address and data registers for C updating. If allocator chokes,
// proceed with the registers we were able to allocate.
//
// At the same time, build up three layouts for this chunk of C:
// sublayoutExt: C data to be loaded/stored
// sublayoutCopy: copied C data
// sublayoutAcc: C data in accumulators
bool allocOK = true;
auto tryAlloc = [&](int regs, Bundle hint = Bundle()) {
auto range = state.ra.try_alloc_range(regs, hint);
allocOK &= range.isValid();
return range;
};
// Save some space for temporary allocations inside C update.
int saveRegs = 1;
if (Tc != Tc_ext)
saveRegs += 16;
auto save = chunkAlloc(saveRegs, 2, state);
vector<RegisterBlock> sublayoutExt, sublayoutCopy, sublayoutAcc;
size_t sublayoutCopySize = 0;
int bytes = 0, bytesConvert = 0;
auto initOA = layoutExt[lstart].offsetAddr;
auto lanchor = lstart;
int tokens = 0, maxTokens = 256;
if (needLoad && hw >= HW::Gen12LP)
maxTokens = tokenCount(hw, strategy.GRFs);
for (lend = lstart; (lend < nblocks) && (tokens < maxTokens); lend++, tokens++) {
auto li0 = blockMap[lend], li1 = blockMap[lend + 1];
int expand = lateCConvert ? div_up(Ts.size(), state.Tacc.size()) : 1;
if (copyCLoad) for (int li = li0; li < li1; li++) {
auto block = layout[li];
block.compact(state.Tacc);
block.offsetBytes = bytesConvert;
bytesConvert += block.nregs() * expand * GRF::bytes(hw);
sublayoutCopy.push_back(block);
}
auto blockExt = layoutExt[lend];
bool origin = (blockExt.offsetR == 0 && blockExt.offsetC == 0 && blockExt.cxComponent <= 0);
if (blockExt.offsetAddr == 0)
initOA = 0, lanchor = lend;
else {
bool is2D = strategy.C.address2D;
blockExt.subAddrOffset(initOA, is2D); // Handle case where we start with an offset block.
if (!copyC)
layout[lend].subAddrOffset(initOA, is2D);
}
auto naddr = addrGRFCount(problem.C, strategy.C, blockExt);
FOR_EACH_C C_addrs[q].push_back(origin ? C_addr0[q] :
(blockExt.offsetAddr == 0) ? tryAlloc(naddr)
: C_addrs[q][lanchor - lstart]);
if (needLoad || copyC)
C_extRegs.push_back(tryAlloc(blockExt.nregs(), getHint(HintType::CLoad, strategy)));
if (copyCLoad) for (int li = li0; li < li1; li++)
C_copyRegs.push_back(tryAlloc(sublayoutCopy[li - li0 + sublayoutCopySize].nregs() * expand, getHint(HintType::CLoad, strategy)));
if (lateCConvert) for (int li = li0; li < li1; li++)
C_convertRegs.push_back(tryAlloc(layout[li].nregs() * expand));
if (!allocOK)
break;
blockExt.offsetBytes = bytes;
bytes += blockExt.nregs() * GRF::bytes(hw);
sublayoutExt.push_back(blockExt);
sublayoutCopySize = sublayoutCopy.size();
}
if (lstart == lend) throw out_of_registers_exception();
sublayoutCopy.resize(sublayoutCopySize);
int listart = blockMap[lstart];
int liend = blockMap[lend];
sublayoutAcc.reserve(liend - listart);
for (int l = listart; l < liend; l++)
sublayoutAcc.push_back(layout[l]);
safeReleaseRanges(save, state);
// Set up C addresses relative to prior blocks.
// TODO: use inline address offsets instead of setupAddrRel for constant offsets.
FOR_EACH_C {
Address2DParams C_params;
auto C_addrsWith0 = C_addrs[q];
auto C_sublayoutWith0 = sublayoutExt;
C_addrsWith0.insert(C_addrsWith0.begin(), C_addr0[q]);
C_sublayoutWith0.insert(C_sublayoutWith0.begin(), C_block0);
getDefaultCParams(C_params, state);
setupAddr(Tc_ext, C_addrsWith0, state.effC[q], C_sublayoutWith0, state.inputs.ldc[q], problem.C, strategy.C, strategy, state, C_params, state.ldcMultiples[q], 1);
}
if (strategy.C.atomic) {
// Atomic update.
// Alpha scaling is done earlier; beta scaling isn't supported.
if (!problem.alpha1() || !problem.beta1()) stub();
if (copyC)
copyRegisters(state.Tacc, Tc_ext, sublayoutAcc, sublayoutExt, C_accRange, C_extRange, strategy, state);
else if (state.Tacc != Tc_ext) {