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Make lb_emit_vector_mul_matrix use SIMD if possible

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gingerBill
2021-10-20 13:11:33 +01:00
parent 1bfbed0e02
commit 9e43072113
1 changed files with 71 additions and 3 deletions
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src/llvm_backend_expr.cpp
+71 -3
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@@ -619,11 +619,10 @@ lbValue lb_emit_matrix_mul_vector(lbProcedure *p, lbValue lhs, lbValue rhs, Type
Type *elem = mt->Matrix.elem;
LLVMTypeRef elem_type = lb_type(p->module, elem);
if (lb_matrix_elem_simple(mt)) {
unsigned stride = cast(unsigned)matrix_type_stride_in_elems(mt);
unsigned row_count = cast(unsigned)mt->Matrix.row_count; gb_unused(row_count);
unsigned row_count = cast(unsigned)mt->Matrix.row_count;
unsigned column_count = cast(unsigned)mt->Matrix.column_count;
auto m_columns = slice_make<LLVMValueRef>(permanent_allocator(), column_count);
auto v_rows = slice_make<LLVMValueRef>(permanent_allocator(), column_count);
@@ -709,10 +708,79 @@ lbValue lb_emit_vector_mul_matrix(lbProcedure *p, lbValue lhs, lbValue rhs, Type
i64 vector_count = get_array_type_count(vt);
GB_ASSERT(mt->Matrix.row_count == vector_count);
GB_ASSERT(vector_count == mt->Matrix.row_count);
GB_ASSERT(are_types_identical(mt->Matrix.elem, base_array_type(vt)));
Type *elem = mt->Matrix.elem;
LLVMTypeRef elem_type = lb_type(p->module, elem);
if (lb_matrix_elem_simple(mt)) {
unsigned stride = cast(unsigned)matrix_type_stride_in_elems(mt);
unsigned row_count = cast(unsigned)mt->Matrix.row_count;
unsigned column_count = cast(unsigned)mt->Matrix.column_count; gb_unused(column_count);
auto m_columns = slice_make<LLVMValueRef>(permanent_allocator(), row_count);
auto v_rows = slice_make<LLVMValueRef>(permanent_allocator(), row_count);
unsigned total_count = cast(unsigned)matrix_type_total_elems(mt);
LLVMTypeRef total_matrix_type = LLVMVectorType(elem_type, total_count);
LLVMValueRef matrix_ptr = lb_address_from_load_or_generate_local(p, rhs).value;
LLVMValueRef matrix_vector_ptr = LLVMBuildPointerCast(p->builder, matrix_ptr, LLVMPointerType(total_matrix_type, 0), "");
LLVMValueRef matrix_vector = LLVMBuildLoad(p->builder, matrix_vector_ptr, "");
for (unsigned row_index = 0; row_index < row_count; row_index++) {
auto mask_elems = slice_make<LLVMValueRef>(temporary_allocator(), column_count);
for (unsigned column_index = 0; column_index < column_count; column_index++) {
unsigned offset = row_index + column_index*stride;
mask_elems[column_index] = lb_const_int(p->module, t_u32, offset).value;
}
// transpose mask
LLVMValueRef mask = LLVMConstVector(mask_elems.data, column_count);
LLVMValueRef column = LLVMBuildShuffleVector(p->builder, matrix_vector, LLVMGetUndef(LLVMTypeOf(matrix_vector)), mask, "");
m_columns[row_index] = column;
}
for (unsigned column_index = 0; column_index < row_count; column_index++) {
LLVMValueRef value = lb_emit_struct_ev(p, lhs, column_index).value;
LLVMValueRef row = llvm_splat(p, value, column_count);
v_rows[column_index] = row;
}
GB_ASSERT(row_count > 0);
LLVMValueRef vector = nullptr;
if (is_type_float(elem)) {
for (i64 i = 0; i < row_count; i++) {
LLVMValueRef product = LLVMBuildFMul(p->builder, v_rows[i], m_columns[i], "");
if (i == 0) {
vector = product;
} else {
vector = LLVMBuildFAdd(p->builder, vector, product, "");
}
}
} else {
for (i64 i = 0; i < row_count; i++) {
LLVMValueRef product = LLVMBuildMul(p->builder, v_rows[i], m_columns[i], "");
if (i == 0) {
vector = product;
} else {
vector = LLVMBuildAdd(p->builder, vector, product, "");
}
}
}
lbAddr res = lb_add_local_generated(p, type, true);
LLVMValueRef res_ptr = res.addr.value;
unsigned alignment = cast(unsigned)gb_max(type_align_of(type), lb_alignof(LLVMTypeOf(vector)));
LLVMSetAlignment(res_ptr, alignment);
res_ptr = LLVMBuildPointerCast(p->builder, res_ptr, LLVMPointerType(LLVMTypeOf(vector), 0), "");
LLVMBuildStore(p->builder, vector, res_ptr);
return lb_addr_load(p, res);
}
lbAddr res = lb_add_local_generated(p, type, true);