321 lines
11 KiB
C
321 lines
11 KiB
C
/*
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* Copyright(c) 2019-2021 Qualcomm Innovation Center, Inc. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu/osdep.h"
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#include "fpu/softfloat.h"
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#include "cpu.h"
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#include "fma_emu.h"
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#include "arch.h"
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#include "macros.h"
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#define SF_BIAS 127
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#define SF_MAXEXP 254
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#define SF_MANTBITS 23
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#define float32_nan make_float32(0xffffffff)
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#define BITS_MASK_8 0x5555555555555555ULL
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#define PAIR_MASK_8 0x3333333333333333ULL
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#define NYBL_MASK_8 0x0f0f0f0f0f0f0f0fULL
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#define BYTE_MASK_8 0x00ff00ff00ff00ffULL
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#define HALF_MASK_8 0x0000ffff0000ffffULL
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#define WORD_MASK_8 0x00000000ffffffffULL
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uint64_t interleave(uint32_t odd, uint32_t even)
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{
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/* Convert to long long */
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uint64_t myodd = odd;
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uint64_t myeven = even;
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/* First, spread bits out */
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myodd = (myodd | (myodd << 16)) & HALF_MASK_8;
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myeven = (myeven | (myeven << 16)) & HALF_MASK_8;
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myodd = (myodd | (myodd << 8)) & BYTE_MASK_8;
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myeven = (myeven | (myeven << 8)) & BYTE_MASK_8;
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myodd = (myodd | (myodd << 4)) & NYBL_MASK_8;
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myeven = (myeven | (myeven << 4)) & NYBL_MASK_8;
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myodd = (myodd | (myodd << 2)) & PAIR_MASK_8;
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myeven = (myeven | (myeven << 2)) & PAIR_MASK_8;
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myodd = (myodd | (myodd << 1)) & BITS_MASK_8;
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myeven = (myeven | (myeven << 1)) & BITS_MASK_8;
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/* Now OR together */
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return myeven | (myodd << 1);
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}
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uint64_t deinterleave(uint64_t src)
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{
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/* Get odd and even bits */
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uint64_t myodd = ((src >> 1) & BITS_MASK_8);
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uint64_t myeven = (src & BITS_MASK_8);
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/* Unspread bits */
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myeven = (myeven | (myeven >> 1)) & PAIR_MASK_8;
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myodd = (myodd | (myodd >> 1)) & PAIR_MASK_8;
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myeven = (myeven | (myeven >> 2)) & NYBL_MASK_8;
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myodd = (myodd | (myodd >> 2)) & NYBL_MASK_8;
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myeven = (myeven | (myeven >> 4)) & BYTE_MASK_8;
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myodd = (myodd | (myodd >> 4)) & BYTE_MASK_8;
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myeven = (myeven | (myeven >> 8)) & HALF_MASK_8;
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myodd = (myodd | (myodd >> 8)) & HALF_MASK_8;
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myeven = (myeven | (myeven >> 16)) & WORD_MASK_8;
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myodd = (myodd | (myodd >> 16)) & WORD_MASK_8;
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/* Return odd bits in upper half */
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return myeven | (myodd << 32);
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}
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int32_t conv_round(int32_t a, int n)
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{
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int64_t val;
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if (n == 0) {
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val = a;
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} else if ((a & ((1 << (n - 1)) - 1)) == 0) { /* N-1..0 all zero? */
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/* Add LSB from int part */
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val = ((fSE32_64(a)) + (int64_t) (((uint32_t) ((1 << n) & a)) >> 1));
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} else {
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val = ((fSE32_64(a)) + (1 << (n - 1)));
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}
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val = val >> n;
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return (int32_t)val;
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}
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/* Floating Point Stuff */
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static const FloatRoundMode softfloat_roundingmodes[] = {
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float_round_nearest_even,
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float_round_to_zero,
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float_round_down,
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float_round_up,
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};
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void arch_fpop_start(CPUHexagonState *env)
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{
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set_float_exception_flags(0, &env->fp_status);
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set_float_rounding_mode(
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softfloat_roundingmodes[fREAD_REG_FIELD(USR, USR_FPRND)],
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&env->fp_status);
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}
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#ifdef CONFIG_USER_ONLY
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/*
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* Hexagon Linux kernel only sets the relevant bits in USR (user status
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* register). The exception isn't raised to user mode, so we don't
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* model it in qemu user mode.
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*/
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#define RAISE_FP_EXCEPTION do {} while (0)
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#endif
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#define SOFTFLOAT_TEST_FLAG(FLAG, MYF, MYE) \
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do { \
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if (flags & FLAG) { \
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if (GET_USR_FIELD(USR_##MYF) == 0) { \
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SET_USR_FIELD(USR_##MYF, 1); \
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if (GET_USR_FIELD(USR_##MYE)) { \
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RAISE_FP_EXCEPTION; \
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} \
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} \
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} \
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} while (0)
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void arch_fpop_end(CPUHexagonState *env)
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{
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int flags = get_float_exception_flags(&env->fp_status);
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if (flags != 0) {
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SOFTFLOAT_TEST_FLAG(float_flag_inexact, FPINPF, FPINPE);
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SOFTFLOAT_TEST_FLAG(float_flag_divbyzero, FPDBZF, FPDBZE);
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SOFTFLOAT_TEST_FLAG(float_flag_invalid, FPINVF, FPINVE);
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SOFTFLOAT_TEST_FLAG(float_flag_overflow, FPOVFF, FPOVFE);
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SOFTFLOAT_TEST_FLAG(float_flag_underflow, FPUNFF, FPUNFE);
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}
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}
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int arch_sf_recip_common(float32 *Rs, float32 *Rt, float32 *Rd, int *adjust,
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float_status *fp_status)
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{
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int n_exp;
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int d_exp;
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int ret = 0;
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float32 RsV, RtV, RdV;
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int PeV = 0;
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RsV = *Rs;
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RtV = *Rt;
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if (float32_is_any_nan(RsV) && float32_is_any_nan(RtV)) {
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if (extract32(RsV & RtV, 22, 1) == 0) {
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float_raise(float_flag_invalid, fp_status);
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}
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RdV = RsV = RtV = float32_nan;
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} else if (float32_is_any_nan(RsV)) {
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if (extract32(RsV, 22, 1) == 0) {
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float_raise(float_flag_invalid, fp_status);
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}
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RdV = RsV = RtV = float32_nan;
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} else if (float32_is_any_nan(RtV)) {
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/* or put NaN in num/den fixup? */
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if (extract32(RtV, 22, 1) == 0) {
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float_raise(float_flag_invalid, fp_status);
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}
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RdV = RsV = RtV = float32_nan;
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} else if (float32_is_infinity(RsV) && float32_is_infinity(RtV)) {
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/* or put Inf in num fixup? */
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RdV = RsV = RtV = float32_nan;
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float_raise(float_flag_invalid, fp_status);
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} else if (float32_is_zero(RsV) && float32_is_zero(RtV)) {
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/* or put zero in num fixup? */
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RdV = RsV = RtV = float32_nan;
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float_raise(float_flag_invalid, fp_status);
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} else if (float32_is_zero(RtV)) {
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/* or put Inf in num fixup? */
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uint8_t RsV_sign = float32_is_neg(RsV);
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uint8_t RtV_sign = float32_is_neg(RtV);
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/* Check that RsV is NOT infinite before we overwrite it */
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if (!float32_is_infinity(RsV)) {
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float_raise(float_flag_divbyzero, fp_status);
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}
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RsV = infinite_float32(RsV_sign ^ RtV_sign);
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RtV = float32_one;
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RdV = float32_one;
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} else if (float32_is_infinity(RtV)) {
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RsV = make_float32(0x80000000 & (RsV ^ RtV));
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RtV = float32_one;
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RdV = float32_one;
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} else if (float32_is_zero(RsV)) {
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/* Does this just work itself out? */
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/* No, 0/Inf causes problems. */
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RsV = make_float32(0x80000000 & (RsV ^ RtV));
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RtV = float32_one;
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RdV = float32_one;
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} else if (float32_is_infinity(RsV)) {
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uint8_t RsV_sign = float32_is_neg(RsV);
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uint8_t RtV_sign = float32_is_neg(RtV);
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RsV = infinite_float32(RsV_sign ^ RtV_sign);
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RtV = float32_one;
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RdV = float32_one;
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} else {
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PeV = 0x00;
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/* Basic checks passed */
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n_exp = float32_getexp(RsV);
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d_exp = float32_getexp(RtV);
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if ((n_exp - d_exp + SF_BIAS) <= SF_MANTBITS) {
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/* Near quotient underflow / inexact Q */
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PeV = 0x80;
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RtV = float32_scalbn(RtV, -64, fp_status);
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RsV = float32_scalbn(RsV, 64, fp_status);
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} else if ((n_exp - d_exp + SF_BIAS) > (SF_MAXEXP - 24)) {
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/* Near quotient overflow */
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PeV = 0x40;
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RtV = float32_scalbn(RtV, 32, fp_status);
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RsV = float32_scalbn(RsV, -32, fp_status);
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} else if (n_exp <= SF_MANTBITS + 2) {
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RtV = float32_scalbn(RtV, 64, fp_status);
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RsV = float32_scalbn(RsV, 64, fp_status);
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} else if (d_exp <= 1) {
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RtV = float32_scalbn(RtV, 32, fp_status);
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RsV = float32_scalbn(RsV, 32, fp_status);
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} else if (d_exp > 252) {
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RtV = float32_scalbn(RtV, -32, fp_status);
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RsV = float32_scalbn(RsV, -32, fp_status);
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}
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RdV = 0;
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ret = 1;
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}
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*Rs = RsV;
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*Rt = RtV;
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*Rd = RdV;
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*adjust = PeV;
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return ret;
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}
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int arch_sf_invsqrt_common(float32 *Rs, float32 *Rd, int *adjust,
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float_status *fp_status)
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{
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float32 RsV, RdV;
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int PeV = 0;
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int r_exp;
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int ret = 0;
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RsV = *Rs;
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if (float32_is_any_nan(RsV)) {
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if (extract32(RsV, 22, 1) == 0) {
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float_raise(float_flag_invalid, fp_status);
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}
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RdV = RsV = float32_nan;
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} else if (float32_lt(RsV, float32_zero, fp_status)) {
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/* Negative nonzero values are NaN */
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float_raise(float_flag_invalid, fp_status);
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RsV = float32_nan;
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RdV = float32_nan;
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} else if (float32_is_infinity(RsV)) {
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/* or put Inf in num fixup? */
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RsV = infinite_float32(1);
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RdV = infinite_float32(1);
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} else if (float32_is_zero(RsV)) {
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/* or put zero in num fixup? */
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RdV = float32_one;
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} else {
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PeV = 0x00;
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/* Basic checks passed */
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r_exp = float32_getexp(RsV);
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if (r_exp <= 24) {
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RsV = float32_scalbn(RsV, 64, fp_status);
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PeV = 0xe0;
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}
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RdV = 0;
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ret = 1;
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}
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*Rs = RsV;
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*Rd = RdV;
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*adjust = PeV;
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return ret;
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}
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const uint8_t recip_lookup_table[128] = {
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0x0fe, 0x0fa, 0x0f6, 0x0f2, 0x0ef, 0x0eb, 0x0e7, 0x0e4,
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0x0e0, 0x0dd, 0x0d9, 0x0d6, 0x0d2, 0x0cf, 0x0cc, 0x0c9,
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0x0c6, 0x0c2, 0x0bf, 0x0bc, 0x0b9, 0x0b6, 0x0b3, 0x0b1,
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0x0ae, 0x0ab, 0x0a8, 0x0a5, 0x0a3, 0x0a0, 0x09d, 0x09b,
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0x098, 0x096, 0x093, 0x091, 0x08e, 0x08c, 0x08a, 0x087,
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0x085, 0x083, 0x080, 0x07e, 0x07c, 0x07a, 0x078, 0x075,
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0x073, 0x071, 0x06f, 0x06d, 0x06b, 0x069, 0x067, 0x065,
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0x063, 0x061, 0x05f, 0x05e, 0x05c, 0x05a, 0x058, 0x056,
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0x054, 0x053, 0x051, 0x04f, 0x04e, 0x04c, 0x04a, 0x049,
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0x047, 0x045, 0x044, 0x042, 0x040, 0x03f, 0x03d, 0x03c,
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0x03a, 0x039, 0x037, 0x036, 0x034, 0x033, 0x032, 0x030,
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0x02f, 0x02d, 0x02c, 0x02b, 0x029, 0x028, 0x027, 0x025,
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0x024, 0x023, 0x021, 0x020, 0x01f, 0x01e, 0x01c, 0x01b,
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0x01a, 0x019, 0x017, 0x016, 0x015, 0x014, 0x013, 0x012,
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0x011, 0x00f, 0x00e, 0x00d, 0x00c, 0x00b, 0x00a, 0x009,
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0x008, 0x007, 0x006, 0x005, 0x004, 0x003, 0x002, 0x000,
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};
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const uint8_t invsqrt_lookup_table[128] = {
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0x069, 0x066, 0x063, 0x061, 0x05e, 0x05b, 0x059, 0x057,
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0x054, 0x052, 0x050, 0x04d, 0x04b, 0x049, 0x047, 0x045,
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0x043, 0x041, 0x03f, 0x03d, 0x03b, 0x039, 0x037, 0x036,
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0x034, 0x032, 0x030, 0x02f, 0x02d, 0x02c, 0x02a, 0x028,
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0x027, 0x025, 0x024, 0x022, 0x021, 0x01f, 0x01e, 0x01d,
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0x01b, 0x01a, 0x019, 0x017, 0x016, 0x015, 0x014, 0x012,
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0x011, 0x010, 0x00f, 0x00d, 0x00c, 0x00b, 0x00a, 0x009,
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0x008, 0x007, 0x006, 0x005, 0x004, 0x003, 0x002, 0x001,
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0x0fe, 0x0fa, 0x0f6, 0x0f3, 0x0ef, 0x0eb, 0x0e8, 0x0e4,
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0x0e1, 0x0de, 0x0db, 0x0d7, 0x0d4, 0x0d1, 0x0ce, 0x0cb,
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0x0c9, 0x0c6, 0x0c3, 0x0c0, 0x0be, 0x0bb, 0x0b8, 0x0b6,
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0x0b3, 0x0b1, 0x0af, 0x0ac, 0x0aa, 0x0a8, 0x0a5, 0x0a3,
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0x0a1, 0x09f, 0x09d, 0x09b, 0x099, 0x097, 0x095, 0x093,
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0x091, 0x08f, 0x08d, 0x08b, 0x089, 0x087, 0x086, 0x084,
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0x082, 0x080, 0x07f, 0x07d, 0x07b, 0x07a, 0x078, 0x077,
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0x075, 0x074, 0x072, 0x071, 0x06f, 0x06e, 0x06c, 0x06b,
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};
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