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[CODEGEN] Add cache modifier to tl.load (#351)

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* Add cache modifier to tl.load
* Add comment to cache_modifier
* Remove force_nc_cache
* Update test
This commit is contained in:
daadaada
2021-10-18 13:14:04 +08:00
committed by GitHub
parent 90ded16c32
commit 858dec8372
16 changed files with 119 additions and 63 deletions
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4
lib/codegen/pass.cc
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@@ -25,7 +25,7 @@ namespace codegen {
// TODO:
// There should be a proper pass manager there!
std::unique_ptr<llvm::Module> add_passes_to_emit_bin(ir::module &ir, llvm::LLVMContext& ctx, codegen::target* target,
int cc, int num_warps, int num_stages, bool force_nc_cache, int& shared_static) {
int cc, int num_warps, int num_stages, int& shared_static) {
// generate llvm code
std::string name = ir.get_function_list()[0]->get_name();
std::unique_ptr<llvm::Module> llvm(new llvm::Module(name, ctx));
@@ -46,7 +46,7 @@ std::unique_ptr<llvm::Module> add_passes_to_emit_bin(ir::module &ir, llvm::LLVMC
codegen::transform::coalesce coalesce(&align, &layouts);
codegen::transform::prefetch prefetch_s(target);
codegen::transform::membar barriers(&liveness, &layouts, &allocation, &prefetch_s, target);
codegen::generator isel(&axes, &layouts, &align, &allocation, &swizzle, target, num_warps, force_nc_cache);
codegen::generator isel(&axes, &layouts, &align, &allocation, &swizzle, target, num_warps);
// run passes
dce.run(ir);
peephole.run(ir);

11
lib/codegen/selection/generator.cc
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@@ -197,9 +197,9 @@ generator::generator(analysis::axes *a_axes,
analysis::allocation *alloc,
analysis::swizzle *swizzle,
target *tgt,
unsigned num_warps, bool force_nc_cache)
unsigned num_warps)
: a_axes_(a_axes), layouts_(layouts), alignment_(alignment), alloc_(alloc), swizzle_(swizzle),
tgt_(tgt), num_warps_(num_warps), force_nc_cache_(force_nc_cache), add(&builder_), mul(&builder_), gep(&builder_) {
tgt_(tgt), num_warps_(num_warps), add(&builder_), mul(&builder_), gep(&builder_) {
}
@@ -629,10 +629,9 @@ void generator::visit_load_inst(ir::load_inst* x){
// -----
std::ostringstream asm_oss;
asm_oss << "@$" << n_words; // predicate
// if(force_nc_cache_)
asm_oss << " ld.global";
// else
// asm_oss << " ld.global.cg";
asm_oss << " ld.global";
if (x->get_cache_modifier() == ir::load_inst::CA) asm_oss << ".ca";
if (x->get_cache_modifier() == ir::load_inst::CG) asm_oss << ".cg";
if(n_words > 1)
asm_oss << ".v" << n_words; // vector width
asm_oss << ".b" << width; // word size

5
lib/codegen/transform/peephole.cc
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@@ -116,7 +116,7 @@ bool peephole::rewrite_load_to_shared(ir::instruction *value, ir::builder& build
int nts = layout->nts(layout->get_order()[0]);
int dtsize = value->get_type()->get_scalar_ty()->get_primitive_size_in_bits() / 8;
if(nts*dtsize >= 4){
ir::value* new_load = builder.create_masked_load_async(ptr, msk, val);
ir::value* new_load = builder.create_masked_load_async(ptr, msk, val, ld->get_cache_modifier());
copy_to_shared->replace_all_uses_with(new_load);
return true;
}
@@ -206,7 +206,8 @@ bool peephole::rewrite_select_masked_load(ir::instruction *value, ir::builder& b
builder.set_insert_point(select);
ir::value* new_load = builder.create_masked_load(if_value->get_pointer_operand(),
if_value->get_mask_operand(),
select->get_else_value_op());
select->get_else_value_op(),
if_value->get_cache_modifier());
select->replace_all_uses_with(new_load);
return true;
}

12
lib/codegen/transform/pipeline.cc
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@@ -111,6 +111,8 @@ struct pipeline_info_t {
};
void pipeline::run(ir::module &mod) {
if (num_stages_ <= 1)
return;
// *Very* conservative heuristics for pre-fetching.
// A load instruction can be pipelined if:
// - the pointer is a phi node that references a value
@@ -176,7 +178,7 @@ void pipeline::run(ir::module &mod) {
false_value = remat_false_value;
} else
false_value = builder.create_splat(ir::undef_value::get(ty->get_scalar_ty()), ty->get_block_shapes());
first_loads[0] = builder.create_masked_load(first_ptrs[0], first_masks[0], false_value);
first_loads[0] = builder.create_masked_load(first_ptrs[0], first_masks[0], false_value, load->get_cache_modifier());
for (int stage = 1; stage < num_stages-1; ++stage) {
// mask is the loop condition of the previous iteration
@@ -191,7 +193,7 @@ void pipeline::run(ir::module &mod) {
first_masks[stage] = builder.create_and(first_masks[stage], remat_mask);
false_value = remat_false_value;
}
first_loads[stage] = builder.create_masked_load(first_ptrs[stage], first_masks[stage], false_value);
first_loads[stage] = builder.create_masked_load(first_ptrs[stage], first_masks[stage], false_value, load->get_cache_modifier());
}
// create new phis for induction variables
@@ -220,7 +222,7 @@ void pipeline::run(ir::module &mod) {
next_mask = builder.create_and(next_mask, remat_mask);
false_value = remat_false_value;
}
ir::value* next_load = builder.create_masked_load(next_ptr, next_mask, false_value);
ir::value* next_load = builder.create_masked_load(next_ptr, next_mask, false_value, load->get_cache_modifier());
// phi node
@@ -255,7 +257,7 @@ void pipeline::run(ir::module &mod) {
}
else
false_value = builder.create_splat(ir::undef_value::get(ty->get_scalar_ty()), ty->get_block_shapes());
ir::value* first_load = builder.create_masked_load(first_ptr, first_mask, false_value);
ir::value* first_load = builder.create_masked_load(first_ptr, first_mask, false_value, load->get_cache_modifier());
// pre-fetch next iteration
builder.set_insert_point(block->get_inst_list().back());
ir::value* next_ptr = ptr->get_value_for_block(block);
@@ -266,7 +268,7 @@ void pipeline::run(ir::module &mod) {
next_mask = builder.create_and(next_mask, remat_mask);
false_value = remat_false_value;
}
ir::value* next_load = builder.create_masked_load(next_ptr, next_mask, false_value);
ir::value* next_load = builder.create_masked_load(next_ptr, next_mask, false_value, load->get_cache_modifier());
// phi node
builder.set_insert_point(block->get_first_non_phi());
ir::phi_node* new_load = builder.create_phi(ty, 2);