| /* |
| * Copyright(c) 2019-2021 Qualcomm Innovation Center, Inc. All Rights Reserved. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| #include "qemu/osdep.h" |
| #include "fpu/softfloat.h" |
| #include "cpu.h" |
| #include "fma_emu.h" |
| #include "arch.h" |
| #include "macros.h" |
| |
| #define SF_BIAS 127 |
| #define SF_MAXEXP 254 |
| #define SF_MANTBITS 23 |
| #define float32_nan make_float32(0xffffffff) |
| |
| /* |
| * These three tables are used by the cabacdecbin instruction |
| */ |
| const uint8_t rLPS_table_64x4[64][4] = { |
| {128, 176, 208, 240}, |
| {128, 167, 197, 227}, |
| {128, 158, 187, 216}, |
| {123, 150, 178, 205}, |
| {116, 142, 169, 195}, |
| {111, 135, 160, 185}, |
| {105, 128, 152, 175}, |
| {100, 122, 144, 166}, |
| {95, 116, 137, 158}, |
| {90, 110, 130, 150}, |
| {85, 104, 123, 142}, |
| {81, 99, 117, 135}, |
| {77, 94, 111, 128}, |
| {73, 89, 105, 122}, |
| {69, 85, 100, 116}, |
| {66, 80, 95, 110}, |
| {62, 76, 90, 104}, |
| {59, 72, 86, 99}, |
| {56, 69, 81, 94}, |
| {53, 65, 77, 89}, |
| {51, 62, 73, 85}, |
| {48, 59, 69, 80}, |
| {46, 56, 66, 76}, |
| {43, 53, 63, 72}, |
| {41, 50, 59, 69}, |
| {39, 48, 56, 65}, |
| {37, 45, 54, 62}, |
| {35, 43, 51, 59}, |
| {33, 41, 48, 56}, |
| {32, 39, 46, 53}, |
| {30, 37, 43, 50}, |
| {29, 35, 41, 48}, |
| {27, 33, 39, 45}, |
| {26, 31, 37, 43}, |
| {24, 30, 35, 41}, |
| {23, 28, 33, 39}, |
| {22, 27, 32, 37}, |
| {21, 26, 30, 35}, |
| {20, 24, 29, 33}, |
| {19, 23, 27, 31}, |
| {18, 22, 26, 30}, |
| {17, 21, 25, 28}, |
| {16, 20, 23, 27}, |
| {15, 19, 22, 25}, |
| {14, 18, 21, 24}, |
| {14, 17, 20, 23}, |
| {13, 16, 19, 22}, |
| {12, 15, 18, 21}, |
| {12, 14, 17, 20}, |
| {11, 14, 16, 19}, |
| {11, 13, 15, 18}, |
| {10, 12, 15, 17}, |
| {10, 12, 14, 16}, |
| {9, 11, 13, 15}, |
| {9, 11, 12, 14}, |
| {8, 10, 12, 14}, |
| {8, 9, 11, 13}, |
| {7, 9, 11, 12}, |
| {7, 9, 10, 12}, |
| {7, 8, 10, 11}, |
| {6, 8, 9, 11}, |
| {6, 7, 9, 10}, |
| {6, 7, 8, 9}, |
| {2, 2, 2, 2} |
| }; |
| |
| const uint8_t AC_next_state_MPS_64[64] = { |
| 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, |
| 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, |
| 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, |
| 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, |
| 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, |
| 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, |
| 61, 62, 62, 63 |
| }; |
| |
| |
| const uint8_t AC_next_state_LPS_64[64] = { |
| 0, 0, 1, 2, 2, 4, 4, 5, 6, 7, |
| 8, 9, 9, 11, 11, 12, 13, 13, 15, 15, |
| 16, 16, 18, 18, 19, 19, 21, 21, 22, 22, |
| 23, 24, 24, 25, 26, 26, 27, 27, 28, 29, |
| 29, 30, 30, 30, 31, 32, 32, 33, 33, 33, |
| 34, 34, 35, 35, 35, 36, 36, 36, 37, 37, |
| 37, 38, 38, 63 |
| }; |
| |
| #define BITS_MASK_8 0x5555555555555555ULL |
| #define PAIR_MASK_8 0x3333333333333333ULL |
| #define NYBL_MASK_8 0x0f0f0f0f0f0f0f0fULL |
| #define BYTE_MASK_8 0x00ff00ff00ff00ffULL |
| #define HALF_MASK_8 0x0000ffff0000ffffULL |
| #define WORD_MASK_8 0x00000000ffffffffULL |
| |
| uint64_t interleave(uint32_t odd, uint32_t even) |
| { |
| /* Convert to long long */ |
| uint64_t myodd = odd; |
| uint64_t myeven = even; |
| /* First, spread bits out */ |
| myodd = (myodd | (myodd << 16)) & HALF_MASK_8; |
| myeven = (myeven | (myeven << 16)) & HALF_MASK_8; |
| myodd = (myodd | (myodd << 8)) & BYTE_MASK_8; |
| myeven = (myeven | (myeven << 8)) & BYTE_MASK_8; |
| myodd = (myodd | (myodd << 4)) & NYBL_MASK_8; |
| myeven = (myeven | (myeven << 4)) & NYBL_MASK_8; |
| myodd = (myodd | (myodd << 2)) & PAIR_MASK_8; |
| myeven = (myeven | (myeven << 2)) & PAIR_MASK_8; |
| myodd = (myodd | (myodd << 1)) & BITS_MASK_8; |
| myeven = (myeven | (myeven << 1)) & BITS_MASK_8; |
| /* Now OR together */ |
| return myeven | (myodd << 1); |
| } |
| |
| uint64_t deinterleave(uint64_t src) |
| { |
| /* Get odd and even bits */ |
| uint64_t myodd = ((src >> 1) & BITS_MASK_8); |
| uint64_t myeven = (src & BITS_MASK_8); |
| |
| /* Unspread bits */ |
| myeven = (myeven | (myeven >> 1)) & PAIR_MASK_8; |
| myodd = (myodd | (myodd >> 1)) & PAIR_MASK_8; |
| myeven = (myeven | (myeven >> 2)) & NYBL_MASK_8; |
| myodd = (myodd | (myodd >> 2)) & NYBL_MASK_8; |
| myeven = (myeven | (myeven >> 4)) & BYTE_MASK_8; |
| myodd = (myodd | (myodd >> 4)) & BYTE_MASK_8; |
| myeven = (myeven | (myeven >> 8)) & HALF_MASK_8; |
| myodd = (myodd | (myodd >> 8)) & HALF_MASK_8; |
| myeven = (myeven | (myeven >> 16)) & WORD_MASK_8; |
| myodd = (myodd | (myodd >> 16)) & WORD_MASK_8; |
| |
| /* Return odd bits in upper half */ |
| return myeven | (myodd << 32); |
| } |
| |
| int32_t conv_round(int32_t a, int n) |
| { |
| int64_t val; |
| |
| if (n == 0) { |
| val = a; |
| } else if ((a & ((1 << (n - 1)) - 1)) == 0) { /* N-1..0 all zero? */ |
| /* Add LSB from int part */ |
| val = ((fSE32_64(a)) + (int64_t) (((uint32_t) ((1 << n) & a)) >> 1)); |
| } else { |
| val = ((fSE32_64(a)) + (1 << (n - 1))); |
| } |
| |
| val = val >> n; |
| return (int32_t)val; |
| } |
| |
| /* Floating Point Stuff */ |
| |
| static const FloatRoundMode softfloat_roundingmodes[] = { |
| float_round_nearest_even, |
| float_round_to_zero, |
| float_round_down, |
| float_round_up, |
| }; |
| |
| void arch_fpop_start(CPUHexagonState *env) |
| { |
| set_float_exception_flags(0, &env->fp_status); |
| set_float_rounding_mode( |
| softfloat_roundingmodes[fREAD_REG_FIELD(USR, USR_FPRND)], |
| &env->fp_status); |
| } |
| |
| #ifdef CONFIG_USER_ONLY |
| /* |
| * Hexagon Linux kernel only sets the relevant bits in USR (user status |
| * register). The exception isn't raised to user mode, so we don't |
| * model it in qemu user mode. |
| */ |
| #define RAISE_FP_EXCEPTION do {} while (0) |
| #endif |
| |
| #define SOFTFLOAT_TEST_FLAG(FLAG, MYF, MYE) \ |
| do { \ |
| if (flags & FLAG) { \ |
| if (GET_USR_FIELD(USR_##MYF) == 0) { \ |
| SET_USR_FIELD(USR_##MYF, 1); \ |
| if (GET_USR_FIELD(USR_##MYE)) { \ |
| RAISE_FP_EXCEPTION; \ |
| } \ |
| } \ |
| } \ |
| } while (0) |
| |
| void arch_fpop_end(CPUHexagonState *env) |
| { |
| int flags = get_float_exception_flags(&env->fp_status); |
| if (flags != 0) { |
| SOFTFLOAT_TEST_FLAG(float_flag_inexact, FPINPF, FPINPE); |
| SOFTFLOAT_TEST_FLAG(float_flag_divbyzero, FPDBZF, FPDBZE); |
| SOFTFLOAT_TEST_FLAG(float_flag_invalid, FPINVF, FPINVE); |
| SOFTFLOAT_TEST_FLAG(float_flag_overflow, FPOVFF, FPOVFE); |
| SOFTFLOAT_TEST_FLAG(float_flag_underflow, FPUNFF, FPUNFE); |
| } |
| } |
| |
| int arch_sf_recip_common(float32 *Rs, float32 *Rt, float32 *Rd, int *adjust, |
| float_status *fp_status) |
| { |
| int n_exp; |
| int d_exp; |
| int ret = 0; |
| float32 RsV, RtV, RdV; |
| int PeV = 0; |
| RsV = *Rs; |
| RtV = *Rt; |
| if (float32_is_any_nan(RsV) && float32_is_any_nan(RtV)) { |
| if (extract32(RsV & RtV, 22, 1) == 0) { |
| float_raise(float_flag_invalid, fp_status); |
| } |
| RdV = RsV = RtV = float32_nan; |
| } else if (float32_is_any_nan(RsV)) { |
| if (extract32(RsV, 22, 1) == 0) { |
| float_raise(float_flag_invalid, fp_status); |
| } |
| RdV = RsV = RtV = float32_nan; |
| } else if (float32_is_any_nan(RtV)) { |
| /* or put NaN in num/den fixup? */ |
| if (extract32(RtV, 22, 1) == 0) { |
| float_raise(float_flag_invalid, fp_status); |
| } |
| RdV = RsV = RtV = float32_nan; |
| } else if (float32_is_infinity(RsV) && float32_is_infinity(RtV)) { |
| /* or put Inf in num fixup? */ |
| RdV = RsV = RtV = float32_nan; |
| float_raise(float_flag_invalid, fp_status); |
| } else if (float32_is_zero(RsV) && float32_is_zero(RtV)) { |
| /* or put zero in num fixup? */ |
| RdV = RsV = RtV = float32_nan; |
| float_raise(float_flag_invalid, fp_status); |
| } else if (float32_is_zero(RtV)) { |
| /* or put Inf in num fixup? */ |
| uint8_t RsV_sign = float32_is_neg(RsV); |
| uint8_t RtV_sign = float32_is_neg(RtV); |
| /* Check that RsV is NOT infinite before we overwrite it */ |
| if (!float32_is_infinity(RsV)) { |
| float_raise(float_flag_divbyzero, fp_status); |
| } |
| RsV = infinite_float32(RsV_sign ^ RtV_sign); |
| RtV = float32_one; |
| RdV = float32_one; |
| } else if (float32_is_infinity(RtV)) { |
| RsV = make_float32(0x80000000 & (RsV ^ RtV)); |
| RtV = float32_one; |
| RdV = float32_one; |
| } else if (float32_is_zero(RsV)) { |
| /* Does this just work itself out? */ |
| /* No, 0/Inf causes problems. */ |
| RsV = make_float32(0x80000000 & (RsV ^ RtV)); |
| RtV = float32_one; |
| RdV = float32_one; |
| } else if (float32_is_infinity(RsV)) { |
| uint8_t RsV_sign = float32_is_neg(RsV); |
| uint8_t RtV_sign = float32_is_neg(RtV); |
| RsV = infinite_float32(RsV_sign ^ RtV_sign); |
| RtV = float32_one; |
| RdV = float32_one; |
| } else { |
| PeV = 0x00; |
| /* Basic checks passed */ |
| n_exp = float32_getexp(RsV); |
| d_exp = float32_getexp(RtV); |
| if ((n_exp - d_exp + SF_BIAS) <= SF_MANTBITS) { |
| /* Near quotient underflow / inexact Q */ |
| PeV = 0x80; |
| RtV = float32_scalbn(RtV, -64, fp_status); |
| RsV = float32_scalbn(RsV, 64, fp_status); |
| } else if ((n_exp - d_exp + SF_BIAS) > (SF_MAXEXP - 24)) { |
| /* Near quotient overflow */ |
| PeV = 0x40; |
| RtV = float32_scalbn(RtV, 32, fp_status); |
| RsV = float32_scalbn(RsV, -32, fp_status); |
| } else if (n_exp <= SF_MANTBITS + 2) { |
| RtV = float32_scalbn(RtV, 64, fp_status); |
| RsV = float32_scalbn(RsV, 64, fp_status); |
| } else if (d_exp <= 1) { |
| RtV = float32_scalbn(RtV, 32, fp_status); |
| RsV = float32_scalbn(RsV, 32, fp_status); |
| } else if (d_exp > 252) { |
| RtV = float32_scalbn(RtV, -32, fp_status); |
| RsV = float32_scalbn(RsV, -32, fp_status); |
| } |
| RdV = 0; |
| ret = 1; |
| } |
| *Rs = RsV; |
| *Rt = RtV; |
| *Rd = RdV; |
| *adjust = PeV; |
| return ret; |
| } |
| |
| int arch_sf_invsqrt_common(float32 *Rs, float32 *Rd, int *adjust, |
| float_status *fp_status) |
| { |
| float32 RsV, RdV; |
| int PeV = 0; |
| int r_exp; |
| int ret = 0; |
| RsV = *Rs; |
| if (float32_is_any_nan(RsV)) { |
| if (extract32(RsV, 22, 1) == 0) { |
| float_raise(float_flag_invalid, fp_status); |
| } |
| RdV = RsV = float32_nan; |
| } else if (float32_lt(RsV, float32_zero, fp_status)) { |
| /* Negative nonzero values are NaN */ |
| float_raise(float_flag_invalid, fp_status); |
| RsV = float32_nan; |
| RdV = float32_nan; |
| } else if (float32_is_infinity(RsV)) { |
| /* or put Inf in num fixup? */ |
| RsV = infinite_float32(1); |
| RdV = infinite_float32(1); |
| } else if (float32_is_zero(RsV)) { |
| /* or put zero in num fixup? */ |
| RdV = float32_one; |
| } else { |
| PeV = 0x00; |
| /* Basic checks passed */ |
| r_exp = float32_getexp(RsV); |
| if (r_exp <= 24) { |
| RsV = float32_scalbn(RsV, 64, fp_status); |
| PeV = 0xe0; |
| } |
| RdV = 0; |
| ret = 1; |
| } |
| *Rs = RsV; |
| *Rd = RdV; |
| *adjust = PeV; |
| return ret; |
| } |
| |
| const uint8_t recip_lookup_table[128] = { |
| 0x0fe, 0x0fa, 0x0f6, 0x0f2, 0x0ef, 0x0eb, 0x0e7, 0x0e4, |
| 0x0e0, 0x0dd, 0x0d9, 0x0d6, 0x0d2, 0x0cf, 0x0cc, 0x0c9, |
| 0x0c6, 0x0c2, 0x0bf, 0x0bc, 0x0b9, 0x0b6, 0x0b3, 0x0b1, |
| 0x0ae, 0x0ab, 0x0a8, 0x0a5, 0x0a3, 0x0a0, 0x09d, 0x09b, |
| 0x098, 0x096, 0x093, 0x091, 0x08e, 0x08c, 0x08a, 0x087, |
| 0x085, 0x083, 0x080, 0x07e, 0x07c, 0x07a, 0x078, 0x075, |
| 0x073, 0x071, 0x06f, 0x06d, 0x06b, 0x069, 0x067, 0x065, |
| 0x063, 0x061, 0x05f, 0x05e, 0x05c, 0x05a, 0x058, 0x056, |
| 0x054, 0x053, 0x051, 0x04f, 0x04e, 0x04c, 0x04a, 0x049, |
| 0x047, 0x045, 0x044, 0x042, 0x040, 0x03f, 0x03d, 0x03c, |
| 0x03a, 0x039, 0x037, 0x036, 0x034, 0x033, 0x032, 0x030, |
| 0x02f, 0x02d, 0x02c, 0x02b, 0x029, 0x028, 0x027, 0x025, |
| 0x024, 0x023, 0x021, 0x020, 0x01f, 0x01e, 0x01c, 0x01b, |
| 0x01a, 0x019, 0x017, 0x016, 0x015, 0x014, 0x013, 0x012, |
| 0x011, 0x00f, 0x00e, 0x00d, 0x00c, 0x00b, 0x00a, 0x009, |
| 0x008, 0x007, 0x006, 0x005, 0x004, 0x003, 0x002, 0x000, |
| }; |
| |
| const uint8_t invsqrt_lookup_table[128] = { |
| 0x069, 0x066, 0x063, 0x061, 0x05e, 0x05b, 0x059, 0x057, |
| 0x054, 0x052, 0x050, 0x04d, 0x04b, 0x049, 0x047, 0x045, |
| 0x043, 0x041, 0x03f, 0x03d, 0x03b, 0x039, 0x037, 0x036, |
| 0x034, 0x032, 0x030, 0x02f, 0x02d, 0x02c, 0x02a, 0x028, |
| 0x027, 0x025, 0x024, 0x022, 0x021, 0x01f, 0x01e, 0x01d, |
| 0x01b, 0x01a, 0x019, 0x017, 0x016, 0x015, 0x014, 0x012, |
| 0x011, 0x010, 0x00f, 0x00d, 0x00c, 0x00b, 0x00a, 0x009, |
| 0x008, 0x007, 0x006, 0x005, 0x004, 0x003, 0x002, 0x001, |
| 0x0fe, 0x0fa, 0x0f6, 0x0f3, 0x0ef, 0x0eb, 0x0e8, 0x0e4, |
| 0x0e1, 0x0de, 0x0db, 0x0d7, 0x0d4, 0x0d1, 0x0ce, 0x0cb, |
| 0x0c9, 0x0c6, 0x0c3, 0x0c0, 0x0be, 0x0bb, 0x0b8, 0x0b6, |
| 0x0b3, 0x0b1, 0x0af, 0x0ac, 0x0aa, 0x0a8, 0x0a5, 0x0a3, |
| 0x0a1, 0x09f, 0x09d, 0x09b, 0x099, 0x097, 0x095, 0x093, |
| 0x091, 0x08f, 0x08d, 0x08b, 0x089, 0x087, 0x086, 0x084, |
| 0x082, 0x080, 0x07f, 0x07d, 0x07b, 0x07a, 0x078, 0x077, |
| 0x075, 0x074, 0x072, 0x071, 0x06f, 0x06e, 0x06c, 0x06b, |
| }; |
