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Use the information about the target cache provided by the TargetTransformInfo. 

Reviewed-by: Tobias Grosser <tobias@grosser.es>

Differential Revision: https://reviews.llvm.org/D37178

llvm-svn: 312255
This commit is contained in:
Roman Gareev 2017-08-31 17:07:54 +00:00
parent 866df0d1ae
commit 6589748920
1 changed files with 72 additions and 8 deletions
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80
polly/lib/Transform/ScheduleOptimizer.cpp
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@ -153,28 +153,51 @@ static cl::opt<int> ThroughputVectorFma(
// represent the parameters of the target cache, which do not have typical
// values that can be used by default. However, to apply the pattern matching
// optimizations, we use the values of the parameters of Intel Core i7-3820
// SandyBridge in case the parameters are not specified. Such an approach helps
// also to attain the high-performance on IBM POWER System S822 and IBM Power
// 730 Express server.
// SandyBridge in case the parameters are not specified or not provided by the
// TargetTransformInfo.
static cl::opt<int> FirstCacheLevelAssociativity(
"polly-target-1st-cache-level-associativity",
cl::desc("The associativity of the first cache level."), cl::Hidden,
cl::init(8), cl::ZeroOrMore, cl::cat(PollyCategory));
cl::init(-1), cl::ZeroOrMore, cl::cat(PollyCategory));
static cl::opt<int> FirstCacheLevelDefaultAssociativity(
"polly-target-1st-cache-level-default-associativity",
cl::desc("The default associativity of the first cache level"
" (if not enough were provided by the TargetTransformInfo)."),
cl::Hidden, cl::init(8), cl::ZeroOrMore, cl::cat(PollyCategory));
static cl::opt<int> SecondCacheLevelAssociativity(
"polly-target-2nd-cache-level-associativity",
cl::desc("The associativity of the second cache level."), cl::Hidden,
cl::init(8), cl::ZeroOrMore, cl::cat(PollyCategory));
cl::init(-1), cl::ZeroOrMore, cl::cat(PollyCategory));
static cl::opt<int> SecondCacheLevelDefaultAssociativity(
"polly-target-2nd-cache-level-default-associativity",
cl::desc("The default associativity of the second cache level"
" (if not enough were provided by the TargetTransformInfo)."),
cl::Hidden, cl::init(8), cl::ZeroOrMore, cl::cat(PollyCategory));
static cl::opt<int> FirstCacheLevelSize(
"polly-target-1st-cache-level-size",
cl::desc("The size of the first cache level specified in bytes."),
cl::Hidden, cl::init(-1), cl::ZeroOrMore, cl::cat(PollyCategory));
static cl::opt<int> FirstCacheLevelDefaultSize(
"polly-target-1st-cache-level-default-size",
cl::desc("The default size of the first cache level specified in bytes"
" (if not enough were provided by the TargetTransformInfo)."),
cl::Hidden, cl::init(32768), cl::ZeroOrMore, cl::cat(PollyCategory));
static cl::opt<int> SecondCacheLevelSize(
"polly-target-2nd-cache-level-size",
cl::desc("The size of the second level specified in bytes."), cl::Hidden,
cl::init(262144), cl::ZeroOrMore, cl::cat(PollyCategory));
cl::init(-1), cl::ZeroOrMore, cl::cat(PollyCategory));
static cl::opt<int> SecondCacheLevelDefaultSize(
"polly-target-2nd-cache-level-default-size",
cl::desc("The default size of the second cache level specified in bytes"
" (if not enough were provided by the TargetTransformInfo)."),
cl::Hidden, cl::init(262144), cl::ZeroOrMore, cl::cat(PollyCategory));
static cl::opt<int> VectorRegisterBitwidth(
"polly-target-vector-register-bitwidth",
@ -893,6 +916,44 @@ getMicroKernelParams(const TargetTransformInfo *TTI, MatMulInfoTy MMI) {
return {Mr, Nr};
}
namespace {
/// Determine parameters of the target cache.
///
/// @param TTI Target Transform Info.
void getTargetCacheParameters(const llvm::TargetTransformInfo *TTI) {
auto L1DCache = llvm::TargetTransformInfo::CacheLevel::L1D;
auto L2DCache = llvm::TargetTransformInfo::CacheLevel::L2D;
if (FirstCacheLevelSize == -1) {
if (TTI->getCacheSize(L1DCache).hasValue())
FirstCacheLevelSize = TTI->getCacheSize(L1DCache).getValue();
else
FirstCacheLevelSize = static_cast<int>(FirstCacheLevelDefaultSize);
}
if (SecondCacheLevelSize == -1) {
if (TTI->getCacheSize(L2DCache).hasValue())
SecondCacheLevelSize = TTI->getCacheSize(L2DCache).getValue();
else
SecondCacheLevelSize = static_cast<int>(SecondCacheLevelDefaultSize);
}
if (FirstCacheLevelAssociativity == -1) {
if (TTI->getCacheAssociativity(L1DCache).hasValue())
FirstCacheLevelAssociativity =
TTI->getCacheAssociativity(L1DCache).getValue();
else
FirstCacheLevelAssociativity =
static_cast<int>(FirstCacheLevelDefaultAssociativity);
}
if (SecondCacheLevelAssociativity == -1) {
if (TTI->getCacheAssociativity(L2DCache).hasValue())
SecondCacheLevelAssociativity =
TTI->getCacheAssociativity(L2DCache).getValue();
else
SecondCacheLevelAssociativity =
static_cast<int>(SecondCacheLevelDefaultAssociativity);
}
}
} // namespace
/// Get parameters of the BLIS macro kernel.
///
/// During the computation of matrix multiplication, blocks of partitioned
@ -901,6 +962,7 @@ getMicroKernelParams(const TargetTransformInfo *TTI, MatMulInfoTy MMI) {
/// iterations. Since parameters of the macro kernel determine sizes of these
/// blocks, there are upper and lower bounds on these parameters.
///
/// @param TTI Target Transform Info.
/// @param MicroKernelParams Parameters of the micro-kernel
/// to be taken into account.
/// @param MMI Parameters of the matrix multiplication operands.
@ -908,8 +970,10 @@ getMicroKernelParams(const TargetTransformInfo *TTI, MatMulInfoTy MMI) {
/// @see MacroKernelParamsTy
/// @see MicroKernelParamsTy
static struct MacroKernelParamsTy
getMacroKernelParams(const MicroKernelParamsTy &MicroKernelParams,
getMacroKernelParams(const llvm::TargetTransformInfo *TTI,
const MicroKernelParamsTy &MicroKernelParams,
MatMulInfoTy MMI) {
getTargetCacheParameters(TTI);
// According to www.cs.utexas.edu/users/flame/pubs/TOMS-BLIS-Analytical.pdf,
// it requires information about the first two levels of a cache to determine
// all the parameters of a macro-kernel. It also checks that an associativity
@ -1227,7 +1291,7 @@ ScheduleTreeOptimizer::optimizeMatMulPattern(isl::schedule_node Node,
NewK = NewK == DimOutNum - 2 ? NewJ : NewK;
Node = permuteBandNodeDimensions(Node, NewK, DimOutNum - 1);
auto MicroKernelParams = getMicroKernelParams(TTI, MMI);
auto MacroKernelParams = getMacroKernelParams(MicroKernelParams, MMI);
auto MacroKernelParams = getMacroKernelParams(TTI, MicroKernelParams, MMI);
Node = createMacroKernel(Node, MacroKernelParams);
Node = createMicroKernel(Node, MicroKernelParams);
if (MacroKernelParams.Mc == 1 || MacroKernelParams.Nc == 1 ||