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neorv32_zfinx_extension_intrinsics.h
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neorv32_zfinx_extension_intrinsics.h
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// #################################################################################################
// # << NEORV32 - Intrinsics + Emulation Functions for the RISC-V "Zfinx" CPU extension >> #
// # ********************************************************************************************* #
// # The intrinsics provided by this library allow to use the hardware floating-point unit of the #
// # RISC-V Zfinx CPU extension without the need for Zfinx support by the compiler / toolchain. #
// # ********************************************************************************************* #
// # BSD 3-Clause License #
// # #
// # Copyright (c) 2024, Stephan Nolting. All rights reserved. #
// # #
// # Redistribution and use in source and binary forms, with or without modification, are #
// # permitted provided that the following conditions are met: #
// # #
// # 1. Redistributions of source code must retain the above copyright notice, this list of #
// # conditions and the following disclaimer. #
// # #
// # 2. Redistributions in binary form must reproduce the above copyright notice, this list of #
// # conditions and the following disclaimer in the documentation and/or other materials #
// # provided with the distribution. #
// # #
// # 3. Neither the name of the copyright holder nor the names of its contributors may be used to #
// # endorse or promote products derived from this software without specific prior written #
// # permission. #
// # #
// # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS #
// # OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF #
// # MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE #
// # COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, #
// # EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE #
// # GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED #
// # AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING #
// # NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED #
// # OF THE POSSIBILITY OF SUCH DAMAGE. #
// # ********************************************************************************************* #
// # The NEORV32 Processor - https://github.com/stnolting/neorv32 (c) Stephan Nolting #
// #################################################################################################
/**********************************************************************//**
* @file floating_point_test/neorv32_zfinx_extension_intrinsics.h
* @author Stephan Nolting
*
* @brief "Intrinsic" library for the NEORV32 single-precision floating-point in x registers (Zfinx) extension
* @brief Also provides emulation functions for all intrinsics (functionality re-built in pure software). The functionality of the emulation
* @brief functions is based on the RISC-V floating-point spec.
*
* @note All operations from this library use the default GCC "round to nearest, ties to even" rounding mode.
*
* @warning This library is just a temporary fall-back until the Zfinx extensions are supported by the upstream RISC-V GCC port.
**************************************************************************/
#ifndef neorv32_zfinx_extension_intrinsics_h
#define neorv32_zfinx_extension_intrinsics_h
#define __USE_GNU
#define _GNU_SOURCE
#include <float.h>
#include <math.h>
/**********************************************************************//**
* Sanity check
**************************************************************************/
#if defined __riscv_f || (__riscv_flen == 32)
#error Application programs using the Zfinx intrinsic library have to be compiled WITHOUT the <F> MARCH ISA attribute!
#endif
/**********************************************************************//**
* Custom data type to access floating-point values as native floats and in binary representation
**************************************************************************/
typedef union
{
uint32_t binary_value; /**< Access as native float */
float float_value; /**< Access in binary representation */
} float_conv_t;
// ################################################################################################
// Helper functions
// ################################################################################################
/**********************************************************************//**
* Flush to zero if de-normal number.
*
* @warning Subnormal numbers are not supported yet! Flush them to zero.
*
* @param[in] tmp Source operand.
* @return Result.
**************************************************************************/
float subnormal_flush(float tmp) {
float res = tmp;
// flush to zero if subnormal
if (fpclassify(tmp) == FP_SUBNORMAL) {
if (signbit(tmp) != 0) {
res = -0.0f;
}
else {
res = +0.0f;
}
}
return res;
}
// ################################################################################################
// "Intrinsics"
// ################################################################################################
/**********************************************************************//**
* Single-precision floating-point addition
*
* @param[in] rs1 Source operand 1.
* @param[in] rs2 Source operand 2.
* @return Result.
**************************************************************************/
inline float __attribute__ ((always_inline)) riscv_intrinsic_fadds(float rs1, float rs2) {
float_conv_t opa, opb, res;
opa.float_value = rs1;
opb.float_value = rs2;
res.binary_value = CUSTOM_INSTR_R3_TYPE(0b0000000, opb.binary_value, opa.binary_value, 0b000, 0b1010011);
return res.float_value;
}
/**********************************************************************//**
* Single-precision floating-point subtraction
*
* @param[in] rs1 Source operand 1.
* @param[in] rs2 Source operand 2.
* @return Result.
**************************************************************************/
inline float __attribute__ ((always_inline)) riscv_intrinsic_fsubs(float rs1, float rs2) {
float_conv_t opa, opb, res;
opa.float_value = rs1;
opb.float_value = rs2;
res.binary_value = CUSTOM_INSTR_R3_TYPE(0b0000100, opb.binary_value, opa.binary_value, 0b000, 0b1010011);
return res.float_value;
}
/**********************************************************************//**
* Single-precision floating-point multiplication
*
* @param[in] rs1 Source operand 1.
* @param[in] rs2 Source operand 2.
* @return Result.
**************************************************************************/
inline float __attribute__ ((always_inline)) riscv_intrinsic_fmuls(float rs1, float rs2) {
float_conv_t opa, opb, res;
opa.float_value = rs1;
opb.float_value = rs2;
res.binary_value = CUSTOM_INSTR_R3_TYPE(0b0001000, opb.binary_value, opa.binary_value, 0b000, 0b1010011);
return res.float_value;
}
/**********************************************************************//**
* Single-precision floating-point minimum
*
* @param[in] rs1 Source operand 1.
* @param[in] rs2 Source operand 2.
* @return Result.
**************************************************************************/
inline float __attribute__ ((always_inline)) riscv_intrinsic_fmins(float rs1, float rs2) {
float_conv_t opa, opb, res;
opa.float_value = rs1;
opb.float_value = rs2;
res.binary_value = CUSTOM_INSTR_R3_TYPE(0b0010100, opb.binary_value, opa.binary_value, 0b000, 0b1010011);
return res.float_value;
}
/**********************************************************************//**
* Single-precision floating-point maximum
*
* @param[in] rs1 Source operand 1.
* @param[in] rs2 Source operand 2.
* @return Result.
**************************************************************************/
inline float __attribute__ ((always_inline)) riscv_intrinsic_fmaxs(float rs1, float rs2) {
float_conv_t opa, opb, res;
opa.float_value = rs1;
opb.float_value = rs2;
res.binary_value = CUSTOM_INSTR_R3_TYPE(0b0010100, opb.binary_value, opa.binary_value, 0b001, 0b1010011);
return res.float_value;
}
/**********************************************************************//**
* Single-precision floating-point convert float to unsigned integer
*
* @param[in] rs1 Source operand 1.
* @return Result.
**************************************************************************/
inline uint32_t __attribute__ ((always_inline)) riscv_intrinsic_fcvt_wus(float rs1) {
float_conv_t opa;
opa.float_value = rs1;
return CUSTOM_INSTR_R2_TYPE(0b1100000, 0b00001, opa.binary_value, 0b000, 0b1010011);
}
/**********************************************************************//**
* Single-precision floating-point convert float to signed integer
*
* @param[in] rs1 Source operand 1.
* @return Result.
**************************************************************************/
inline int32_t __attribute__ ((always_inline)) riscv_intrinsic_fcvt_ws(float rs1) {
float_conv_t opa;
opa.float_value = rs1;
return (int32_t)CUSTOM_INSTR_R2_TYPE(0b1100000, 0b00000, opa.binary_value, 0b000, 0b1010011);
}
/**********************************************************************//**
* Single-precision floating-point convert unsigned integer to float
*
* @param[in] rs1 Source operand 1.
* @return Result.
**************************************************************************/
inline float __attribute__ ((always_inline)) riscv_intrinsic_fcvt_swu(uint32_t rs1) {
float_conv_t res;
res.binary_value = CUSTOM_INSTR_R2_TYPE(0b1101000, 0b00001, rs1, 0b000, 0b1010011);
return res.float_value;
}
/**********************************************************************//**
* Single-precision floating-point convert signed integer to float
*
* @param[in] rs1 Source operand 1.
* @return Result.
**************************************************************************/
inline float __attribute__ ((always_inline)) riscv_intrinsic_fcvt_sw(int32_t rs1) {
float_conv_t res;
res.binary_value = CUSTOM_INSTR_R2_TYPE(0b1101000, 0b00000, rs1, 0b000, 0b1010011);
return res.float_value;
}
/**********************************************************************//**
* Single-precision floating-point equal comparison
*
* @param[in] rs1 Source operand 1.
* @param[in] rs2 Source operand 2.
* @return Result.
**************************************************************************/
inline uint32_t __attribute__ ((always_inline)) riscv_intrinsic_feqs(float rs1, float rs2) {
float_conv_t opa, opb;
opa.float_value = rs1;
opb.float_value = rs2;
return CUSTOM_INSTR_R3_TYPE(0b1010000, opb.binary_value, opa.binary_value, 0b010, 0b1010011);
}
/**********************************************************************//**
* Single-precision floating-point less-than comparison
*
* @param[in] rs1 Source operand 1.
* @param[in] rs2 Source operand 2.
* @return Result.
**************************************************************************/
inline uint32_t __attribute__ ((always_inline)) riscv_intrinsic_flts(float rs1, float rs2) {
float_conv_t opa, opb;
opa.float_value = rs1;
opb.float_value = rs2;
return CUSTOM_INSTR_R3_TYPE(0b1010000, opb.binary_value, opa.binary_value, 0b001, 0b1010011);
}
/**********************************************************************//**
* Single-precision floating-point less-than-or-equal comparison
*
* @param[in] rs1 Source operand 1.
* @param[in] rs2 Source operand 2.
* @return Result.
**************************************************************************/
inline uint32_t __attribute__ ((always_inline)) riscv_intrinsic_fles(float rs1, float rs2) {
float_conv_t opa, opb;
opa.float_value = rs1;
opb.float_value = rs2;
return CUSTOM_INSTR_R3_TYPE(0b1010000, opb.binary_value, opa.binary_value, 0b000, 0b1010011);
}
/**********************************************************************//**
* Single-precision floating-point sign-injection
*
* @param[in] rs1 Source operand 1.
* @param[in] rs2 Source operand 2.
* @return Result.
**************************************************************************/
inline float __attribute__ ((always_inline)) riscv_intrinsic_fsgnjs(float rs1, float rs2) {
float_conv_t opa, opb, res;
opa.float_value = rs1;
opb.float_value = rs2;
res.binary_value = CUSTOM_INSTR_R3_TYPE(0b0010000, opb.binary_value, opa.binary_value, 0b000, 0b1010011);
return res.float_value;
}
/**********************************************************************//**
* Single-precision floating-point sign-injection NOT
*
* @param[in] rs1 Source operand 1.
* @param[in] rs2 Source operand 2.
* @return Result.
**************************************************************************/
inline float __attribute__ ((always_inline)) riscv_intrinsic_fsgnjns(float rs1, float rs2) {
float_conv_t opa, opb, res;
opa.float_value = rs1;
opb.float_value = rs2;
res.binary_value = CUSTOM_INSTR_R3_TYPE(0b0010000, opb.binary_value, opa.binary_value, 0b001, 0b1010011);
return res.float_value;
}
/**********************************************************************//**
* Single-precision floating-point sign-injection XOR
*
* @param[in] rs1 Source operand 1.
* @param[in] rs2 Source operand 2.
* @return Result.
**************************************************************************/
inline float __attribute__ ((always_inline)) riscv_intrinsic_fsgnjxs(float rs1, float rs2) {
float_conv_t opa, opb, res;
opa.float_value = rs1;
opb.float_value = rs2;
res.binary_value = CUSTOM_INSTR_R3_TYPE(0b0010000, opb.binary_value, opa.binary_value, 0b010, 0b1010011);
return res.float_value;
}
/**********************************************************************//**
* Single-precision floating-point number classification
*
* @param[in] rs1 Source operand 1.
* @return Result.
**************************************************************************/
inline uint32_t __attribute__ ((always_inline)) riscv_intrinsic_fclasss(float rs1) {
float_conv_t opa;
opa.float_value = rs1;
return CUSTOM_INSTR_R2_TYPE(0b1110000, 0b00000, opa.binary_value, 0b001, 0b1010011);
}
// ################################################################################################
// !!! UNSUPPORTED instructions !!!
// ################################################################################################
/**********************************************************************//**
* Single-precision floating-point division
*
* @warning This instruction is not supported and should raise an illegal instruction exception when executed.
*
* @param[in] rs1 Source operand 1.
* @param[in] rs2 Source operand 2.
* @return Result.
**************************************************************************/
inline float __attribute__ ((always_inline)) riscv_intrinsic_fdivs(float rs1, float rs2) {
float_conv_t opa, opb, res;
opa.float_value = rs1;
opb.float_value = rs2;
res.binary_value = CUSTOM_INSTR_R3_TYPE(0b0001100, opb.binary_value, opa.binary_value, 0b000, 0b1010011);
return res.float_value;
}
/**********************************************************************//**
* Single-precision floating-point square root
*
* @warning This instruction is not supported and should raise an illegal instruction exception when executed.
*
* @param[in] rs1 Source operand 1.
* @return Result.
**************************************************************************/
inline float __attribute__ ((always_inline)) riscv_intrinsic_fsqrts(float rs1) {
float_conv_t opa, res;
opa.float_value = rs1;
res.binary_value = CUSTOM_INSTR_R2_TYPE(0b0101100, 0b00000, opa.binary_value, 0b000, 0b1010011);
return res.float_value;
}
/**********************************************************************//**
* Single-precision floating-point fused multiply-add
*
* @warning This instruction is not supported and should raise an illegal instruction exception when executed.
*
* @param[in] rs1 Source operand 1
* @param[in] rs2 Source operand 2
* @param[in] rs3 Source operand 3
* @return Result.
**************************************************************************/
inline float __attribute__ ((always_inline)) riscv_intrinsic_fmadds(float rs1, float rs2, float rs3) {
float_conv_t opa, opb, opc, res;
opa.float_value = rs1;
opb.float_value = rs2;
opc.float_value = rs3;
res.binary_value = CUSTOM_INSTR_R4_TYPE(opc.binary_value, opb.binary_value, opa.binary_value, 0b000, 0b1000011);
return res.float_value;
}
/**********************************************************************//**
* Single-precision floating-point fused multiply-sub
*
* @warning This instruction is not supported and should raise an illegal instruction exception when executed.
*
* @param[in] rs1 Source operand 1
* @param[in] rs2 Source operand 2
* @param[in] rs3 Source operand 3
* @return Result.
**************************************************************************/
inline float __attribute__ ((always_inline)) riscv_intrinsic_fmsubs(float rs1, float rs2, float rs3) {
float_conv_t opa, opb, opc, res;
opa.float_value = rs1;
opb.float_value = rs2;
opc.float_value = rs3;
res.binary_value = CUSTOM_INSTR_R4_TYPE(opc.binary_value, opb.binary_value, opa.binary_value, 0b000, 0b1000111);
return res.float_value;
}
/**********************************************************************//**
* Single-precision floating-point fused negated multiply-sub
*
* @warning This instruction is not supported and should raise an illegal instruction exception when executed.
*
* @param[in] rs1 Source operand 1
* @param[in] rs2 Source operand 2
* @param[in] rs3 Source operand 3
* @return Result.
**************************************************************************/
inline float __attribute__ ((always_inline)) riscv_intrinsic_fnmsubs(float rs1, float rs2, float rs3) {
float_conv_t opa, opb, opc, res;
opa.float_value = rs1;
opb.float_value = rs2;
opc.float_value = rs3;
res.binary_value = CUSTOM_INSTR_R4_TYPE(opc.binary_value, opb.binary_value, opa.binary_value, 0b000, 0b1001011);
return res.float_value;
}
/**********************************************************************//**
* Single-precision floating-point fused negated multiply-add
*
* @warning This instruction is not supported and should raise an illegal instruction exception when executed.
*
* @param[in] rs1 Source operand 1
* @param[in] rs2 Source operand 2
* @param[in] rs3 Source operand 3
* @return Result.
**************************************************************************/
inline float __attribute__ ((always_inline)) riscv_intrinsic_fnmadds(float rs1, float rs2, float rs3) {
float_conv_t opa, opb, opc, res;
opa.float_value = rs1;
opb.float_value = rs2;
opc.float_value = rs3;
res.binary_value = CUSTOM_INSTR_R4_TYPE(opc.binary_value, opb.binary_value, opa.binary_value, 0b000, 0b1001111);
return res.float_value;
}
// ################################################################################################
// Emulation functions
// ################################################################################################
/**********************************************************************//**
* Single-precision floating-point addition
*
* @param[in] rs1 Source operand 1.
* @param[in] rs2 Source operand 2.
* @return Result.
**************************************************************************/
float __attribute__ ((noinline)) riscv_emulate_fadds(float rs1, float rs2) {
float opa = subnormal_flush(rs1);
float opb = subnormal_flush(rs2);
float res = opa + opb;
// make NAN canonical
if (fpclassify(res) == FP_NAN) {
res = NAN;
}
return subnormal_flush(res);
}
/**********************************************************************//**
* Single-precision floating-point subtraction
*
* @param[in] rs1 Source operand 1.
* @param[in] rs2 Source operand 2.
* @return Result.
**************************************************************************/
float __attribute__ ((noinline)) riscv_emulate_fsubs(float rs1, float rs2) {
float opa = subnormal_flush(rs1);
float opb = subnormal_flush(rs2);
float res = opa - opb;
// make NAN canonical
if (fpclassify(res) == FP_NAN) {
res = NAN;
}
return subnormal_flush(res);
}
/**********************************************************************//**
* Single-precision floating-point multiplication
*
* @param[in] rs1 Source operand 1.
* @param[in] rs2 Source operand 2.
* @return Result.
**************************************************************************/
float __attribute__ ((noinline)) riscv_emulate_fmuls(float rs1, float rs2) {
float opa = subnormal_flush(rs1);
float opb = subnormal_flush(rs2);
float res = opa * opb;
return subnormal_flush(res);
}
/**********************************************************************//**
* Single-precision floating-point minimum
*
* @param[in] rs1 Source operand 1.
* @param[in] rs2 Source operand 2.
* @return Result.
**************************************************************************/
float __attribute__ ((noinline)) riscv_emulate_fmins(float rs1, float rs2) {
float opa = subnormal_flush(rs1);
float opb = subnormal_flush(rs2);
union {
uint32_t binary_value; /**< Access as native float */
float float_value; /**< Access in binary representation */
} tmp_a, tmp_b;
if ((fpclassify(opa) == FP_NAN) && (fpclassify(opb) == FP_NAN)) {
return nanf("");
}
if (fpclassify(opa) == FP_NAN) {
return opb;
}
if (fpclassify(opb) == FP_NAN) {
return opa;
}
// RISC-V spec: -0 < +0
tmp_a.float_value = opa;
tmp_b.float_value = opb;
if (((tmp_a.binary_value == 0x80000000) && (tmp_b.binary_value == 0x00000000)) ||
((tmp_a.binary_value == 0x00000000) && (tmp_b.binary_value == 0x80000000))) {
return -0.0f;
}
return fmin(opa, opb);
}
/**********************************************************************//**
* Single-precision floating-point maximum
*
* @param[in] rs1 Source operand 1.
* @param[in] rs2 Source operand 2.
* @return Result.
**************************************************************************/
float __attribute__ ((noinline)) riscv_emulate_fmaxs(float rs1, float rs2) {
float opa = subnormal_flush(rs1);
float opb = subnormal_flush(rs2);
union {
uint32_t binary_value; /**< Access as native float */
float float_value; /**< Access in binary representation */
} tmp_a, tmp_b;
if ((fpclassify(opa) == FP_NAN) && (fpclassify(opb) == FP_NAN)) {
return nanf("");
}
if (fpclassify(opa) == FP_NAN) {
return opb;
}
if (fpclassify(opb) == FP_NAN) {
return opa;
}
// RISC-V spec: -0 < +0
tmp_a.float_value = opa;
tmp_b.float_value = opb;
if (((tmp_a.binary_value == 0x80000000) && (tmp_b.binary_value == 0x00000000)) ||
((tmp_a.binary_value == 0x00000000) && (tmp_b.binary_value == 0x80000000))) {
return +0.0f;
}
return fmax(opa, opb);
}
/**********************************************************************//**
* Single-precision floating-point float to unsigned integer
*
* @param[in] rs1 Source operand 1.
* @return Result.
**************************************************************************/
uint32_t __attribute__ ((noinline)) riscv_emulate_fcvt_wus(float rs1) {
float opa = subnormal_flush(rs1);
return (uint32_t)rint(opa);
}
/**********************************************************************//**
* Single-precision floating-point float to signed integer
*
* @param[in] rs1 Source operand 1.
* @return Result.
**************************************************************************/
int32_t __attribute__ ((noinline)) riscv_emulate_fcvt_ws(float rs1) {
float opa = subnormal_flush(rs1);
return (int32_t)rint(opa);
}
/**********************************************************************//**
* Single-precision floating-point unsigned integer to float
*
* @param[in] rs1 Source operand 1.
* @return Result.
**************************************************************************/
float __attribute__ ((noinline)) riscv_emulate_fcvt_swu(uint32_t rs1) {
return (float)rs1;
}
/**********************************************************************//**
* Single-precision floating-point signed integer to float
*
* @param[in] rs1 Source operand 1.
* @return Result.
**************************************************************************/
float __attribute__ ((noinline)) riscv_emulate_fcvt_sw(int32_t rs1) {
return (float)rs1;
}
/**********************************************************************//**
* Single-precision floating-point equal comparison
*
* @param[in] rs1 Source operand 1.
* @param[in] rs2 Source operand 2.
* @return Result.
**************************************************************************/
uint32_t __attribute__ ((noinline)) riscv_emulate_feqs(float rs1, float rs2) {
float opa = subnormal_flush(rs1);
float opb = subnormal_flush(rs2);
if ((fpclassify(opa) == FP_NAN) || (fpclassify(opb) == FP_NAN)) {
return 0;
}
if isless(opa, opb) {
return 0;
}
else if isgreater(opa, opb) {
return 0;
}
else {
return 1;
}
}
/**********************************************************************//**
* Single-precision floating-point less-than comparison
*
* @param[in] rs1 Source operand 1.
* @param[in] rs2 Source operand 2.
* @return Result.
**************************************************************************/
uint32_t __attribute__ ((noinline)) riscv_emulate_flts(float rs1, float rs2) {
float opa = subnormal_flush(rs1);
float opb = subnormal_flush(rs2);
if ((fpclassify(opa) == FP_NAN) || (fpclassify(opb) == FP_NAN)) {
return 0;
}
if isless(opa, opb) {
return 1;
}
else {
return 0;
}
}
/**********************************************************************//**
* Single-precision floating-point less-than-or-equal comparison
*
* @param[in] rs1 Source operand 1.
* @param[in] rs2 Source operand 2.
* @return Result.
**************************************************************************/
uint32_t __attribute__ ((noinline)) riscv_emulate_fles(float rs1, float rs2) {
float opa = subnormal_flush(rs1);
float opb = subnormal_flush(rs2);
if ((fpclassify(opa) == FP_NAN) || (fpclassify(opb) == FP_NAN)) {
return 0;
}
if islessequal(opa, opb) {
return 1;
}
else {
return 0;
}
}
/**********************************************************************//**
* Single-precision floating-point sign-injection
*
* @param[in] rs1 Source operand 1.
* @param[in] rs2 Source operand 2.
* @return Result.
**************************************************************************/
float __attribute__ ((noinline)) riscv_emulate_fsgnjs(float rs1, float rs2) {
float opa = rs1;
float opb = rs2;
int sign_1 = (int)signbit(opa);
int sign_2 = (int)signbit(opb);
float res = 0;
if (sign_2 != 0) { // opb is negative
if (sign_1 == 0) {
res = -opa;
}
else {
res = opa;
}
}
else { // opb is positive
if (sign_1 == 0) {
res = opa;
}
else {
res = -opa;
}
}
return res;
}
/**********************************************************************//**
* Single-precision floating-point sign-injection NOT
*
* @param[in] rs1 Source operand 1.
* @param[in] rs2 Source operand 2.
* @return Result.
**************************************************************************/
float __attribute__ ((noinline)) riscv_emulate_fsgnjns(float rs1, float rs2) {
float opa = rs1;
float opb = rs2;
int sign_1 = (int)signbit(opa);
int sign_2 = (int)signbit(opb);
float res = 0;
if (sign_2 != 0) { // opb is negative
if (sign_1 == 0) {
res = opa;
}
else {
res = -opa;
}
}
else { // opb is positive
if (sign_1 == 0) {
res = -opa;
}
else {
res = opa;
}
}
return res;
}
/**********************************************************************//**
* Single-precision floating-point sign-injection XOR
*
* @param[in] rs1 Source operand 1.
* @param[in] rs2 Source operand 2.
* @return Result.
**************************************************************************/
float __attribute__ ((noinline)) riscv_emulate_fsgnjxs(float rs1, float rs2) {
float opa = rs1;
float opb = rs2;
int sign_1 = (int)signbit(opa);
int sign_2 = (int)signbit(opb);
float res = 0;
if (((sign_1 == 0) && (sign_2 != 0)) || ((sign_1 != 0) && (sign_2 == 0))) {
if (sign_1 == 0) {
res = -opa;
}
else {
res = opa;
}
}
else {
if (sign_1 == 0) {
res = opa;
}
else {
res = -opa;
}
}
return res;
}
/**********************************************************************//**
* Single-precision floating-point number classification
*
* @param[in] rs1 Source operand 1.
* @return Result.
**************************************************************************/
uint32_t __attribute__ ((noinline)) riscv_emulate_fclasss(float rs1) {
float opa = rs1;
union {
uint32_t binary_value; /**< Access as native float */
float float_value; /**< Access in binary representation */
} aux;
// RISC-V classify result layout
const uint32_t CLASS_NEG_INF = 1 << 0; // negative infinity
const uint32_t CLASS_NEG_NORM = 1 << 1; // negative normal number
const uint32_t CLASS_NEG_DENORM = 1 << 2; // negative subnormal number
const uint32_t CLASS_NEG_ZERO = 1 << 3; // negative zero
const uint32_t CLASS_POS_ZERO = 1 << 4; // positive zero
const uint32_t CLASS_POS_DENORM = 1 << 5; // positive subnormal number
const uint32_t CLASS_POS_NORM = 1 << 6; // positive normal number
const uint32_t CLASS_POS_INF = 1 << 7; // positive infinity
const uint32_t CLASS_SNAN = 1 << 8; // signaling NaN (sNaN)
const uint32_t CLASS_QNAN = 1 << 9; // quiet NaN (qNaN)
int tmp = fpclassify(opa);
int sgn = (int)signbit(opa);
uint32_t res = 0;
// infinity
if (tmp == FP_INFINITE) {
if (sgn) { res |= CLASS_NEG_INF; }
else { res |= CLASS_POS_INF; }
}
// zero
if (tmp == FP_ZERO) {
if (sgn) { res |= CLASS_NEG_ZERO; }
else { res |= CLASS_POS_ZERO; }
}
// normal
if (tmp == FP_NORMAL) {
if (sgn) { res |= CLASS_NEG_NORM; }
else { res |= CLASS_POS_NORM; }
}
// subnormal
if (tmp == FP_SUBNORMAL) {
if (sgn) { res |= CLASS_NEG_DENORM; }
else { res |= CLASS_POS_DENORM; }
}
// NaN
if (tmp == FP_NAN) {
aux.float_value = opa;
if ((aux.binary_value >> 22) & 0b1) { // bit 22 (mantissa's MSB) is set -> canonical (quiet) NAN
res |= CLASS_QNAN;
}
else {
res |= CLASS_SNAN;
}
}
return res;
}
/**********************************************************************//**
* Single-precision floating-point division
*
* @param[in] rs1 Source operand 1.
* @param[in] rs2 Source operand 2.
* @return Result.
**************************************************************************/
float __attribute__ ((noinline)) riscv_emulate_fdivs(float rs1, float rs2) {
float opa = subnormal_flush(rs1);
float opb = subnormal_flush(rs2);
float res = opa / opb;
return subnormal_flush(res);
}
/**********************************************************************//**
* Single-precision floating-point square root
*
* @param[in] rs1 Source operand 1.
* @return Result.
**************************************************************************/
float __attribute__ ((noinline)) riscv_emulate_fsqrts(float rs1) {
float opa = subnormal_flush(rs1);