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Make transpose use SIMD if possible

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gingerBill
2021-10-20 15:22:02 +01:00
parent cdf881a378
commit 465c87bd5a
1 changed files with 52 additions and 21 deletions
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73
src/llvm_backend_expr.cpp
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@@ -495,21 +495,70 @@ bool lb_matrix_elem_simple(Type *t) {
case Basic_f16le:
case Basic_f16be:
// TODO(bill): determine when this is fine
return false;
return true;
}
}
return true;
}
LLVMValueRef lb_matrix_to_vector(lbProcedure *p, lbValue matrix) {
Type *mt = base_type(matrix.type);
GB_ASSERT(mt->kind == Type_Matrix);
LLVMTypeRef elem_type = lb_type(p->module, mt->Matrix.elem);
unsigned total_count = cast(unsigned)matrix_type_total_elems(mt);
LLVMTypeRef total_matrix_type = LLVMVectorType(elem_type, total_count);
LLVMValueRef ptr = lb_address_from_load_or_generate_local(p, matrix).value;
LLVMValueRef matrix_vector_ptr = LLVMBuildPointerCast(p->builder, ptr, LLVMPointerType(total_matrix_type, 0), "");
LLVMValueRef matrix_vector = LLVMBuildLoad(p->builder, matrix_vector_ptr, "");
return matrix_vector;
}
lbValue lb_emit_matrix_tranpose(lbProcedure *p, lbValue m, Type *type) {
if (is_type_array(m.type)) {
// no-op
m.type = type;
return m;
}
Type *mt = base_type(m.type);
GB_ASSERT(mt->kind == Type_Matrix);
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;
auto rows = slice_make<LLVMValueRef>(permanent_allocator(), row_count);
auto mask_elems = slice_make<LLVMValueRef>(permanent_allocator(), column_count);
LLVMValueRef vector = lb_matrix_to_vector(p, m);
for (unsigned i = 0; i < row_count; i++) {
for (unsigned j = 0; j < column_count; j++) {
unsigned offset = stride*j + i;
mask_elems[j] = lb_const_int(p->module, t_u32, offset).value;
}
// transpose mask
LLVMValueRef mask = LLVMConstVector(mask_elems.data, column_count);
LLVMValueRef row = LLVMBuildShuffleVector(p->builder, vector, LLVMGetUndef(LLVMTypeOf(vector)), mask, "");
rows[i] = row;
}
lbAddr res = lb_add_local_generated(p, type, true);
for_array(i, rows) {
LLVMValueRef row = rows[i];
lbValue dst_row_ptr = lb_emit_matrix_epi(p, res.addr, 0, i);
LLVMValueRef ptr = dst_row_ptr.value;
ptr = LLVMBuildPointerCast(p->builder, ptr, LLVMPointerType(LLVMTypeOf(row), 0), "");
LLVMBuildStore(p->builder, row, ptr);
}
return lb_addr_load(p, res);
}
lbAddr res = lb_add_local_generated(p, type, true);
i64 row_count = mt->Matrix.row_count;
@@ -556,21 +605,6 @@ lbValue lb_emit_outer_product(lbProcedure *p, lbValue a, lbValue b, Type *type)
}
LLVMValueRef lb_matrix_to_vector(lbProcedure *p, lbValue matrix) {
Type *mt = base_type(matrix.type);
GB_ASSERT(mt->kind == Type_Matrix);
LLVMTypeRef elem_type = lb_type(p->module, mt->Matrix.elem);
unsigned total_count = cast(unsigned)matrix_type_total_elems(mt);
LLVMTypeRef total_matrix_type = LLVMVectorType(elem_type, total_count);
LLVMValueRef ptr = lb_address_from_load_or_generate_local(p, matrix).value;
LLVMValueRef matrix_vector_ptr = LLVMBuildPointerCast(p->builder, ptr, LLVMPointerType(total_matrix_type, 0), "");
LLVMValueRef matrix_vector = LLVMBuildLoad(p->builder, matrix_vector_ptr, "");
return matrix_vector;
}
lbValue lb_emit_matrix_mul(lbProcedure *p, lbValue lhs, lbValue rhs, Type *type) {
Type *xt = base_type(lhs.type);
Type *yt = base_type(rhs.type);
@@ -594,12 +628,11 @@ lbValue lb_emit_matrix_mul(lbProcedure *p, lbValue lhs, lbValue rhs, Type *type)
auto x_rows = slice_make<LLVMValueRef>(permanent_allocator(), outer_rows);
auto y_columns = slice_make<LLVMValueRef>(permanent_allocator(), outer_columns);
LLVMValueRef x_vector = lb_matrix_to_vector(p, lhs);
LLVMValueRef y_vector = lb_matrix_to_vector(p, rhs);
auto mask_elems = slice_make<LLVMValueRef>(permanent_allocator(), inner);
for (unsigned i = 0; i < outer_rows; i++) {
auto mask_elems = slice_make<LLVMValueRef>(temporary_allocator(), inner);
for (unsigned j = 0; j < inner; j++) {
unsigned offset = x_stride*j + i;
mask_elems[j] = lb_const_int(p->module, t_u32, offset).value;
@@ -616,8 +649,6 @@ lbValue lb_emit_matrix_mul(lbProcedure *p, lbValue lhs, lbValue rhs, Type *type)
LLVMValueRef column = LLVMBuildShuffleVector(p->builder, y_vector, LLVMGetUndef(LLVMTypeOf(y_vector)), mask, "");
y_columns[i] = column;
}
lbAddr res = lb_add_local_generated(p, type, true);
for_array(i, x_rows) {
@@ -760,8 +791,8 @@ lbValue lb_emit_vector_mul_matrix(lbProcedure *p, lbValue lhs, lbValue rhs, Type
LLVMValueRef matrix_vector = lb_matrix_to_vector(p, rhs);
auto mask_elems = slice_make<LLVMValueRef>(permanent_allocator(), column_count);
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;