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d30ff374a1
Based on existing softfloat64 support and Berkeley SoftFloat. This is targeted at drivers that can't preserve denorms, so operations where denorm support is irrelevant like conversions to/from integers aren't handled. Because the existing mechanism used by Gallium for softfloat64 doesn't support includes, we unfortunately can't extract common code into a header. This can be done later if we switch Gallium to using glslang and spirv-to-nir. Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/37608>
68 lines
2.5 KiB
C
68 lines
2.5 KiB
C
/*
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* Copyright © 2015 Intel Corporation
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* Copyright © 2025 Valve Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*
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*/
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#include "nir.h"
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#include "nir_builder.h"
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static inline nir_def *
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nir_lower_softfloat_func(nir_builder *b,
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nir_alu_instr *instr,
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nir_function *softfloat_func,
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const struct glsl_type *return_type)
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{
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nir_def *params[4] = {
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NULL,
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};
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nir_variable *ret_tmp =
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nir_local_variable_create(b->impl, return_type, "return_tmp");
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nir_deref_instr *ret_deref = nir_build_deref_var(b, ret_tmp);
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params[0] = &ret_deref->def;
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assert(nir_op_infos[instr->op].num_inputs + 1 == softfloat_func->num_params);
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for (unsigned i = 0; i < nir_op_infos[instr->op].num_inputs; i++) {
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nir_alu_type n_type =
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nir_alu_type_get_base_type(nir_op_infos[instr->op].input_types[i]);
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/* Add bitsize */
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n_type = n_type | instr->src[0].src.ssa->bit_size;
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const struct glsl_type *param_type =
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glsl_scalar_type(nir_get_glsl_base_type_for_nir_type(n_type));
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nir_variable *param =
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nir_local_variable_create(b->impl, param_type, "param");
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nir_deref_instr *param_deref = nir_build_deref_var(b, param);
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nir_store_deref(b, param_deref, nir_mov_alu(b, instr->src[i], 1), ~0);
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assert(i + 1 < ARRAY_SIZE(params));
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params[i + 1] = ¶m_deref->def;
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}
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nir_inline_function_impl(b, softfloat_func->impl, params, NULL);
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return nir_load_deref(b, ret_deref);
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}
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