Add internal functions using by MIPS ASE DSP instructions. Signed-off-by: Jia Liu <pro...@gmail.com> --- target-mips/Makefile.objs | 2 +- target-mips/dsp_helper.c | 1100 +++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 1101 insertions(+), 1 deletion(-) create mode 100644 target-mips/dsp_helper.c
diff --git a/target-mips/Makefile.objs b/target-mips/Makefile.objs index 2e0e093..55b252d 100644 --- a/target-mips/Makefile.objs +++ b/target-mips/Makefile.objs @@ -1,4 +1,4 @@ -obj-y += translate.o op_helper.o helper.o cpu.o +obj-y += translate.o dsp_helper.o op_helper.o helper.o cpu.o obj-$(CONFIG_SOFTMMU) += machine.o $(obj)/op_helper.o: QEMU_CFLAGS += $(HELPER_CFLAGS) diff --git a/target-mips/dsp_helper.c b/target-mips/dsp_helper.c new file mode 100644 index 0000000..779f5c7 --- /dev/null +++ b/target-mips/dsp_helper.c @@ -0,0 +1,1100 @@ +/* + * MIPS ASE DSP Instruction emulation helpers for QEMU. + * + * Copyright (c) 2012 Jia Liu <pro...@gmail.com> + * Dongxue Zhang <elat....@gmail.com> + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library 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 + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, see <http://www.gnu.org/licenses/>. + */ + +#include "cpu.h" +#include "helper.h" + +/*** MIPS DSP internal functions begin ***/ +static inline int not_word_value(target_long value) +{ + target_ulong temp; + temp = (target_long)(int32_t)(value & 0xFFFFFFFF); + return value == temp ? 0 : 1; +} + +static inline void set_DSPControl_overflow_flag(CPUMIPSState *env, + uint32_t flag, int position) +{ + env->active_tc.DSPControl |= (target_ulong)flag << position; +} + +static inline void set_DSPControl_carryflag(CPUMIPSState *env, uint32_t flag) +{ + env->active_tc.DSPControl |= (target_ulong)flag << 13; +} + +static inline uint32_t get_DSPControl_carryflag(CPUMIPSState *env) +{ + return (env->active_tc.DSPControl >> 13) & 0x01; +} + +static inline void set_DSPControl_24(CPUMIPSState *env, uint32_t flag, int len) +{ + uint32_t filter; + + filter = ((0x01 << len) - 1) << 24; + filter = ~filter; + + env->active_tc.DSPControl &= filter; + env->active_tc.DSPControl |= (target_ulong)flag << 24; +} + +static inline uint32_t get_DSPControl_24(CPUMIPSState *env, int len) +{ + uint32_t filter; + + filter = (0x01 << len) - 1; + + return (env->active_tc.DSPControl >> 24) & filter; +} + +static inline void set_DSPControl_pos(CPUMIPSState *env, uint32_t pos) +{ + target_ulong dspc; + + dspc = env->active_tc.DSPControl; +#ifndef TARGET_MIPS64 + dspc = dspc & 0xFFFFFFC0; + dspc |= pos; +#else + dspc = dspc & 0xFFFFFF80; + dspc |= pos; +#endif + env->active_tc.DSPControl = dspc; +} + +static inline uint32_t get_DSPControl_pos(CPUMIPSState *env) +{ + target_ulong dspc; + uint32_t pos; + + dspc = env->active_tc.DSPControl; + +#ifndef TARGET_MIPS64 + pos = dspc & 0x3F; +#else + pos = dspc & 0x7F; +#endif + + return pos; +} + +static inline void set_DSPControl_efi(CPUMIPSState *env, uint32_t flag) +{ + env->active_tc.DSPControl &= 0xFFFFBFFF; + env->active_tc.DSPControl |= (target_ulong)flag << 14; +} + +/* get abs value */ +static inline int8_t mipsdsp_sat_abs_u8(CPUMIPSState *env, uint8_t a) +{ + if ((uint8_t)a == 0x80) { + set_DSPControl_overflow_flag(env, 1, 20); + a = 0x7f; + } else { + if (((uint8_t)a & 0x80) == 0x80) { + a = -a; + } + } + + return a; +} + +static inline int16_t mipsdsp_sat_abs_u16(CPUMIPSState *env, int16_t a) +{ + if ((uint16_t)a == 0x8000) { + set_DSPControl_overflow_flag(env, 1, 20); + a = 0x7fff; + } else { + if (((uint16_t)a & 0x8000) == 0x8000) { + a = -a; + } + } + + return a; +} + +static inline int32_t mipsdsp_sat_abs_u32(CPUMIPSState *env, int32_t a) +{ + if (a == 0x80000000) { + set_DSPControl_overflow_flag(env, 1, 20); + a = 0x7FFFFFFF; + } else { + if ((a & 0x80000000) == 0x80000000) { + a = -a; + } + } + + return a; +} + +/* get sum value */ +static inline int16_t mipsdsp_add_i16(CPUMIPSState *env, int16_t a, int16_t b) +{ + int32_t tempI, temp15, temp16; + + tempI = a + b; + temp15 = (tempI & 0x8000) >> 15; + temp16 = (tempI & 0x10000) >> 16; + + if (temp15 != temp16) { + set_DSPControl_overflow_flag(env, 1, 20); + } + + return a + b; +} + +static inline int16_t mipsdsp_sat_add_i16(CPUMIPSState *env, + int16_t a, int16_t b) +{ + int16_t tempS; + int32_t tempI, temp15, temp16; + + tempS = a + b; + tempI = (int32_t)a + (int32_t)b; + temp15 = (tempI & 0x8000) >> 15; + temp16 = (tempI & 0x10000) >> 16; + + if (temp15 != temp16) { + if (temp16 == 0) { + tempS = 0x7FFF; + } else { + tempS = 0x8000; + } + set_DSPControl_overflow_flag(env, 1, 20); + } + + return tempS; +} + +static inline int32_t mipsdsp_sat_add_i32(CPUMIPSState *env, + int32_t a, int32_t b) +{ + int32_t tempI; + int64_t tempL, temp31, temp32; + + tempI = a + b; + tempL = (int64_t)a + (int64_t)b; + temp31 = (tempL & 0x80000000) >> 31; + temp32 = (tempL & 0x100000000ull) >> 32; + + if (temp31 != temp32) { + if (temp32 == 0) { + tempI = 0x7FFFFFFF; + } else { + tempI = 0x80000000; + } + set_DSPControl_overflow_flag(env, 1, 20); + } + + return tempI; +} + +static inline uint8_t mipsdsp_add_u8(CPUMIPSState *env, uint8_t a, uint8_t b) +{ + uint16_t temp; + + temp = (uint16_t)a + (uint16_t)b; + + if ((temp & 0x0100) == 0x0100) { + set_DSPControl_overflow_flag(env, 1, 20); + } + + return temp & 0xFF; +} + +static inline uint16_t mipsdsp_add_u16(CPUMIPSState *env, + uint16_t a, uint16_t b) +{ + uint32_t temp; + + temp = (uint32_t)a + (uint32_t)b; + + if ((temp & 0x00010000) == 0x00010000) { + set_DSPControl_overflow_flag(env, 1, 20); + } + + return temp & 0xFFFF; +} + +static inline uint8_t mipsdsp_sat_add_u8(CPUMIPSState *env, + uint8_t a, uint8_t b) +{ + uint8_t result; + uint16_t temp; + + temp = (uint16_t)a + (uint16_t)b; + result = temp & 0xFF; + + if ((0x0100 & temp) == 0x0100) { + result = 0xFF; + set_DSPControl_overflow_flag(env, 1, 20); + } + + return result; +} + +static inline uint16_t mipsdsp_sat_add_u16(CPUMIPSState *env, + uint16_t a, uint16_t b) +{ + uint16_t result; + uint32_t temp; + + temp = (uint32_t)a + (uint32_t)b; + result = temp & 0xFFFF; + + if ((0x00010000 & temp) == 0x00010000) { + result = 0xFFFF; + set_DSPControl_overflow_flag(env, 1, 20); + } + + return result; +} + +static inline int32_t mipsdsp_sat32_acc_q31(CPUMIPSState *env, + int32_t acc, int32_t a) +{ + int64_t temp; + int32_t temp32, temp31, result; + int64_t temp_sum; + +#ifndef TARGET_MIPS64 + temp = ((uint64_t)env->active_tc.HI[acc] << 32) | + (uint64_t)env->active_tc.LO[acc]; +#else + temp = (uint64_t)env->active_tc.LO[acc]; +#endif + + temp_sum = (int64_t)a + temp; + + temp32 = (temp_sum >> 32) & 0x01; + temp31 = (temp_sum >> 31) & 0x01; + result = temp_sum & 0xFFFFFFFF; + + if (temp32 != temp31) { + if (temp32 == 0) { + result = 0x80000000; + } else { + result = 0x7FFFFFFF; + } + set_DSPControl_overflow_flag(env, 1, 16 + acc); + } + + return result; +} + +/* a[0] is LO, a[1] is HI. */ +static inline void mipsdsp_sat64_acc_add_q63(CPUMIPSState *env, + int64_t *ret, + int32_t ac, + int64_t *a) +{ + uint32_t temp64, temp63; + int64_t temp[3]; + int64_t acc[3]; + int64_t temp_sum; + + temp[0] = a[0]; + temp[1] = a[1]; + if (((temp[1] >> 63) & 0x01) == 0) { + temp[2] = 0x00; + } else { + temp[2] = ~0ull; + } + + acc[0] = env->active_tc.LO[ac]; + acc[1] = env->active_tc.HI[ac]; + if (((acc[1] >> 63) & 0x01) == 0) { + acc[2] = 0x00; + } else { + acc[2] = ~0ull; + } + + temp_sum = temp[0] + acc[0]; + if (((uint64_t)temp_sum < (uint64_t)temp[0]) && + ((uint64_t)temp_sum < (uint64_t)acc[0])) { + temp[1] += 1; + if (temp[1] == 0) { + temp[2] += 1; + } + } + temp[0] = temp_sum; + + temp_sum = temp[1] + acc[1]; + if (((uint64_t)temp_sum < (uint64_t)temp[1]) && + ((uint64_t)temp_sum < (uint64_t)acc[1])) { + temp[2] += 1; + } + + temp[1] = temp_sum; + temp[2] += acc[2]; + temp64 = temp[1] & 0x01; + temp63 = (temp[0] >> 63) & 0x01; + + if (temp64 != temp63) { + if (temp64 == 1) { + ret[0] = 0x8000000000000000ull; + ret[1] = ~0ull; + } else { + ret[0] = 0x0; + ret[1] = 0x7FFFFFFFFFFFFFFFull; + } + set_DSPControl_overflow_flag(env, 1, 16 + ac); + } else { + ret[0] = temp[0]; + ret[1] = temp[1]; + } +} + +/* a[0] is LO, a[1] is HI. */ +static inline void mipsdsp_sat64_acc_sub_q63(CPUMIPSState *env, + int64_t *ret, + int32_t ac, + int64_t *a) +{ + uint32_t temp64, temp63; + int64_t temp[3]; + int64_t acc[3]; + int64_t temp_sum; + + temp[0] = a[0]; + temp[1] = a[1]; + if (((temp[1] >> 63) & 0x01) == 0) { + temp[2] = 0x00; + } else { + temp[2] = ~0ull; + } + + acc[0] = env->active_tc.LO[ac]; + acc[1] = env->active_tc.HI[ac]; + if (((acc[1] >> 63) & 0x01) == 0) { + acc[2] = 0x00; + } else { + acc[2] = ~0ull; + } + + temp_sum = acc[0] - temp[0]; + if ((uint64_t)temp_sum > (uint64_t)acc[0]) { + acc[1] -= 1; + if (acc[1] == ~0ull) { + acc[2] -= 1; + } + } + acc[0] = temp_sum; + + temp_sum = acc[1] - temp[1]; + if ((uint64_t)temp_sum > (uint64_t)acc[1]) { + acc[2] -= 1; + } + acc[1] = temp_sum; + acc[2] -= temp[2]; + + temp64 = acc[1] & 0x01; + temp63 = (acc[0] >> 63) & 0x01; + + if (temp64 != temp63) { + if (temp64 == 1) { + ret[0] = 0x8000000000000000ull; + ret[1] = ~0ull; + } else { + ret[0] = 0x0; + ret[1] = 0x7FFFFFFFFFFFFFFFull; + } + set_DSPControl_overflow_flag(env, 1, 16 + ac); + } else { + ret[0] = acc[0]; + ret[1] = acc[1]; + } +} + +static inline int32_t mipsdsp_mul_i16_i16(CPUMIPSState *env, + int16_t a, int16_t b) +{ + int32_t temp; + + temp = (int32_t)a * (int32_t)b; + + if ((temp > 0x7FFF) || (temp < 0xFFFF8000)) { + set_DSPControl_overflow_flag(env, 1, 21); + } + temp &= 0x0000FFFF; + + return temp; +} + +static inline int32_t mipsdsp_sat16_mul_i16_i16(CPUMIPSState *env, + int16_t a, int16_t b) +{ + int32_t temp; + + temp = (int32_t)a * (int32_t)b; + + if (temp > 0x7FFF) { + temp = 0x00007FFF; + set_DSPControl_overflow_flag(env, 1, 21); + } else if (temp < 0x00007FFF) { + temp = 0xFFFF8000; + set_DSPControl_overflow_flag(env, 1, 21); + } + temp &= 0x0000FFFF; + + return temp; +} + +static inline int32_t mipsdsp_mul_q15_q15_overflowflag21(CPUMIPSState *env, + uint16_t a, uint16_t b) +{ + int32_t temp; + + if ((a == 0x8000) && (b == 0x8000)) { + temp = 0x7FFFFFFF; + set_DSPControl_overflow_flag(env, 1, 21); + } else { + temp = ((int32_t)(int16_t)a * (int32_t)(int16_t)b) << 1; + } + + return temp; +} + +/* right shift */ +static inline int16_t mipsdsp_rshift1_add_q16(int16_t a, int16_t b) +{ + int32_t temp; + + temp = (int32_t)a + (int32_t)b; + + return (temp >> 1) & 0xFFFF; +} + +/* round right shift */ +static inline int16_t mipsdsp_rrshift1_add_q16(int16_t a, int16_t b) +{ + int32_t temp; + + temp = (int32_t)a + (int32_t)b; + temp += 1; + + return (temp >> 1) & 0xFFFF; +} + +static inline int32_t mipsdsp_rshift1_add_q32(int32_t a, int32_t b) +{ + int64_t temp; + + temp = (int64_t)a + (int64_t)b; + + return (temp >> 1) & 0xFFFFFFFF; +} + +static inline int32_t mipsdsp_rrshift1_add_q32(int32_t a, int32_t b) +{ + int64_t temp; + + temp = (int64_t)a + (int64_t)b; + temp += 1; + + return (temp >> 1) & 0xFFFFFFFF; +} + +static inline uint8_t mipsdsp_rshift1_add_u8(uint8_t a, uint8_t b) +{ + uint16_t temp; + + temp = (uint16_t)a + (uint16_t)b; + + return (temp >> 1) & 0x00FF; +} + +static inline uint8_t mipsdsp_rrshift1_add_u8(uint8_t a, uint8_t b) +{ + uint16_t temp; + + temp = (uint16_t)a + (uint16_t)b + 1; + + return (temp >> 1) & 0x00FF; +} + +static inline int64_t mipsdsp_rashift_short_acc(CPUMIPSState *env, + int32_t ac, + int32_t shift) +{ + int32_t sign, temp31; + int64_t temp, acc; + + sign = (env->active_tc.HI[ac] >> 31) & 0x01; + acc = ((int64_t)env->active_tc.HI[ac] << 32) | + ((int64_t)env->active_tc.LO[ac] & 0xFFFFFFFF); + if (shift == 0) { + temp = acc; + } else { + if (sign == 0) { + temp = (((int64_t)0x01 << (32 - shift + 1)) - 1) & (acc >> shift); + } else { + temp = ((((int64_t)0x01 << (shift + 1)) - 1) << (32 - shift)) | + (acc >> shift); + } + } + + temp31 = (temp >> 31) & 0x01; + if (sign != temp31) { + set_DSPControl_overflow_flag(env, 1, 23); + } + + return temp; +} + +/* 128 bits long. p[0] is LO, p[1] is HI. */ +static inline void mipsdsp_rndrashift_short_acc(CPUMIPSState *env, + int64_t *p, + int32_t ac, + int32_t shift) +{ + int64_t acc; + + acc = ((int64_t)env->active_tc.HI[ac] << 32) | + ((int64_t)env->active_tc.LO[ac] & 0xFFFFFFFF); + if (shift == 0) { + p[0] = acc << 1; + p[1] = (acc >> 63) & 0x01; + } else { + p[0] = acc >> (shift - 1); + p[1] = 0; + } +} + +/* 128 bits long. p[0] is LO, p[1] is HI */ +static inline void mipsdsp_rashift_acc(CPUMIPSState *env, + uint64_t *p, + uint32_t ac, + uint32_t shift) +{ + uint64_t tempB, tempA; + + tempB = env->active_tc.HI[ac]; + tempA = env->active_tc.LO[ac]; + shift = shift & 0x1F; + + if (shift == 0) { + p[1] = tempB; + p[0] = tempA; + } else { + p[0] = (tempB << (64 - shift)) | (tempA >> shift); + p[1] = (int64_t)tempB >> shift; + } +} + +/* 128 bits long. p[0] is LO, p[1] is HI , p[2] is sign of HI.*/ +static inline void mipsdsp_rndrashift_acc(CPUMIPSState *env, + uint64_t *p, + uint32_t ac, + uint32_t shift) +{ + uint64_t tempB, tempA; + + tempB = env->active_tc.HI[ac]; + tempA = env->active_tc.LO[ac]; + shift = shift & 0x3F; + + if (shift == 0) { + p[2] = tempB >> 63; + p[1] = (tempB << 1) | (tempA >> 63); + p[0] = tempA << 1; + } else { + p[0] = (tempB << (65 - shift)) | (tempA >> (shift - 1)); + p[1] = (int64_t)tempB >> (shift - 1); + if (((tempB >> 63) & 0x01) == 1) { + p[2] = ~0ull; + } else { + p[2] = 0x0; + } + } +} + +static inline int32_t mipsdsp_mul_q15_q15(CPUMIPSState *env, + int32_t ac, uint16_t a, uint16_t b) +{ + int32_t temp; + + if ((a == 0x8000) && (b == 0x8000)) { + temp = 0x7FFFFFFF; + set_DSPControl_overflow_flag(env, 1, 16 + ac); + } else { + temp = ((uint32_t)a * (uint32_t)b) << 1; + } + + return temp; +} + +static inline int64_t mipsdsp_mul_q31_q31(CPUMIPSState *env, + int32_t ac, uint32_t a, uint32_t b) +{ + uint64_t temp; + + if ((a == 0x80000000) && (b == 0x80000000)) { + temp = 0x7FFFFFFFFFFFFFFFull; + set_DSPControl_overflow_flag(env, 1, 16 + ac); + } else { + temp = ((uint64_t)a * (uint64_t)b) << 1; + } + + return temp; +} + +static inline uint16_t mipsdsp_mul_u8_u8(uint8_t a, uint8_t b) +{ + return (uint16_t)a * (uint16_t)b; +} + +static inline uint16_t mipsdsp_mul_u8_u16(CPUMIPSState *env, + uint8_t a, uint16_t b) +{ + uint32_t tempI; + + tempI = (uint32_t)a * (uint32_t)b; + if (tempI > 0x0000FFFF) { + tempI = 0x0000FFFF; + set_DSPControl_overflow_flag(env, 1, 21); + } + + return tempI & 0x0000FFFF; +} + +static inline uint64_t mipsdsp_mul_u32_u32(CPUMIPSState *env, + uint32_t a, uint32_t b) +{ + return (uint64_t)a * (uint64_t)b; +} + +static inline int16_t mipsdsp_rndq15_mul_q15_q15(CPUMIPSState *env, + uint16_t a, uint16_t b) +{ + uint32_t temp; + + if ((a == 0x8000) && (b == 0x8000)) { + temp = 0x7FFF0000; + set_DSPControl_overflow_flag(env, 1, 21); + } else { + temp = (a * b) << 1; + temp = temp + 0x00008000; + } + + return (temp & 0xFFFF0000) >> 16; +} + +static inline int32_t mipsdsp_sat16_mul_q15_q15(CPUMIPSState *env, + uint16_t a, uint16_t b) +{ + int32_t temp; + + if ((a == 0x8000) && (b == 0x8000)) { + temp = 0x7FFF0000; + set_DSPControl_overflow_flag(env, 1, 21); + } else { + temp = ((uint32_t)a * (uint32_t)b); + temp = temp << 1; + } + + return (temp >> 16) & 0x0000FFFF; +} + +static inline uint16_t mipsdsp_trunc16_sat16_round(CPUMIPSState *env, + uint32_t a) +{ + uint32_t temp32, temp31; + int64_t temp; + + temp = (int32_t)a + 0x00008000; + temp32 = (temp >> 32) & 0x01; + temp31 = (temp >> 31) & 0x01; + + if (temp32 != temp31) { + temp = 0x7FFFFFFF; + set_DSPControl_overflow_flag(env, 1, 22); + } + + return (temp >> 16) & 0xFFFF; +} + +static inline uint8_t mipsdsp_sat8_reduce_precision(CPUMIPSState *env, + uint16_t a) +{ + uint16_t mag; + uint32_t sign; + + sign = (a >> 15) & 0x01; + mag = a & 0x7FFF; + + if (sign == 0) { + if (mag > 0x7F80) { + set_DSPControl_overflow_flag(env, 1, 22); + return 0xFF; + } else { + return (mag >> 7) & 0xFFFF; + } + } else { + set_DSPControl_overflow_flag(env, 1, 22); + return 0x00; + } +} + +static inline uint8_t mipsdsp_lshift8(CPUMIPSState *env, uint8_t a, uint8_t s) +{ + uint8_t sign; + uint8_t discard; + + if (s == 0) { + return a; + } else { + sign = (a >> 7) & 0x01; + if (sign != 0) { + discard = (((0x01 << (8 - s)) - 1) << s) | + ((a >> (6 - (s - 1))) & ((0x01 << s) - 1)); + } else { + discard = a >> (6 - (s - 1)); + } + + if (discard != 0x00) { + set_DSPControl_overflow_flag(env, 1, 22); + } + return a << s; + } +} + +static inline uint16_t mipsdsp_lshift16(CPUMIPSState *env, + uint16_t a, uint8_t s) +{ + uint8_t sign; + uint16_t discard; + + if (s == 0) { + return a; + } else { + sign = (a >> 15) & 0x01; + if (sign != 0) { + discard = (((0x01 << (16 - s)) - 1) << s) | + ((a >> (14 - (s - 1))) & ((0x01 << s) - 1)); + } else { + discard = a >> (14 - (s - 1)); + } + + if ((discard != 0x0000) && (discard != 0xFFFF)) { + set_DSPControl_overflow_flag(env, 1, 22); + } + return a << s; + } +} + + +static inline uint32_t mipsdsp_lshift32(CPUMIPSState *env, + uint32_t a, uint8_t s) +{ + uint32_t discard; + + if (s == 0) { + return a; + } else { + discard = (int32_t)a >> (31 - (s - 1)); + + if ((discard != 0x00000000) && (discard != 0xFFFFFFFF)) { + set_DSPControl_overflow_flag(env, 1, 22); + } + return a << s; + } +} + +static inline uint16_t mipsdsp_sat16_lshift(CPUMIPSState *env, + uint16_t a, uint8_t s) +{ + uint8_t sign; + uint16_t discard; + + if (s == 0) { + return a; + } else { + sign = (a >> 15) & 0x01; + if (sign != 0) { + discard = (((0x01 << (16 - s)) - 1) << s) | + ((a >> (14 - (s - 1))) & ((0x01 << s) - 1)); + } else { + discard = a >> (14 - (s - 1)); + } + + if ((discard != 0x0000) && (discard != 0xFFFF)) { + set_DSPControl_overflow_flag(env, 1, 22); + return (sign == 0) ? 0x7FFF : 0x8000; + } else { + return a << s; + } + } +} + +static inline uint32_t mipsdsp_sat32_lshift(CPUMIPSState *env, + uint32_t a, uint8_t s) +{ + uint8_t sign; + uint32_t discard; + + if (s == 0) { + return a; + } else { + sign = (a >> 31) & 0x01; + if (sign != 0) { + discard = (((0x01 << (32 - s)) - 1) << s) | + ((a >> (30 - (s - 1))) & ((0x01 << s) - 1)); + } else { + discard = a >> (30 - (s - 1)); + } + + if ((discard != 0x00000000) && (discard != 0xFFFFFFFF)) { + set_DSPControl_overflow_flag(env, 1, 22); + return (sign == 0) ? 0x7FFFFFFF : 0x80000000; + } else { + return a << s; + } + } +} + +static inline uint16_t mipsdsp_rnd16_rashift(uint16_t a, uint8_t s) +{ + uint32_t temp; + + if (s == 0) { + temp = (uint32_t)a << 1; + } else { + temp = (int32_t)(int16_t)a >> (s - 1); + } + + return (temp + 1) >> 1; +} + +static inline uint32_t mipsdsp_rnd32_rashift(uint32_t a, uint8_t s) +{ + int64_t temp; + + if (s == 0) { + temp = a << 1; + } else { + temp = (int64_t)(int32_t)a >> (s - 1); + } + temp += 1; + + return (temp >> 1) & 0x00000000FFFFFFFFull; +} + +static inline uint16_t mipsdsp_sub_i16(CPUMIPSState *env, int16_t a, int16_t b) +{ + uint8_t temp16, temp15; + int32_t temp; + + temp = (int32_t)a - (int32_t)b; + temp16 = (temp >> 16) & 0x01; + temp15 = (temp >> 15) & 0x01; + if (temp16 != temp15) { + set_DSPControl_overflow_flag(env, 1, 20); + } + + return temp & 0x0000FFFF; +} + +static inline uint16_t mipsdsp_sat16_sub(CPUMIPSState *env, + int16_t a, int16_t b) +{ + uint8_t temp16, temp15; + int32_t temp; + + temp = (int32_t)a - (int32_t)b; + temp16 = (temp >> 16) & 0x01; + temp15 = (temp >> 15) & 0x01; + if (temp16 != temp15) { + if (temp16 == 0) { + temp = 0x7FFF; + } else { + temp = 0x8000; + } + set_DSPControl_overflow_flag(env, 1, 20); + } + + return temp & 0x0000FFFF; +} + +static inline uint32_t mipsdsp_sat32_sub(CPUMIPSState *env, + int32_t a, int32_t b) +{ + uint8_t temp32, temp31; + int64_t temp; + + temp = (int64_t)a - (int64_t)b; + temp32 = (temp >> 32) & 0x01; + temp31 = (temp >> 31) & 0x01; + if (temp32 != temp31) { + if (temp32 == 0) { + temp = 0x7FFFFFFF; + } else { + temp = 0x80000000; + } + set_DSPControl_overflow_flag(env, 1, 20); + } + + return temp & 0x00000000FFFFFFFFull; +} + +static inline uint16_t mipsdsp_rshift1_sub_q16(int16_t a, int16_t b) +{ + int32_t temp; + + temp = (int32_t)a - (int32_t)b; + + return (temp >> 1) & 0x0000FFFF; +} + +static inline uint16_t mipsdsp_rrshift1_sub_q16(int16_t a, int16_t b) +{ + int32_t temp; + + temp = (int32_t)a - (int32_t)b; + temp += 1; + + return (temp >> 1) & 0x0000FFFF; +} + +static inline uint32_t mipsdsp_rshift1_sub_q32(int32_t a, int32_t b) +{ + int64_t temp; + + temp = (int64_t)a - (int64_t)b; + + return (temp >> 1) & 0x00000000FFFFFFFFull; +} + +static inline uint32_t mipsdsp_rrshift1_sub_q32(int32_t a, int32_t b) +{ + int64_t temp; + + temp = (int64_t)a - (int64_t)b; + temp += 1; + + return (temp >> 1) & 0x00000000FFFFFFFFull; +} + +static inline uint16_t mipsdsp_sub_u16_u16(CPUMIPSState *env, + uint16_t a, uint16_t b) +{ + uint8_t temp16; + uint32_t temp; + + temp = (uint32_t)a - (uint32_t)b; + temp16 = (temp >> 16) & 0x01; + if (temp16 == 1) { + set_DSPControl_overflow_flag(env, 1, 20); + } + return temp & 0x0000FFFF; +} + +static inline uint16_t mipsdsp_satu16_sub_u16_u16(CPUMIPSState *env, + uint16_t a, uint16_t b) +{ + uint8_t temp16; + uint32_t temp; + + temp = (uint32_t)a - (uint32_t)b; + temp16 = (temp >> 16) & 0x01; + + if (temp16 == 1) { + temp = 0x0000; + set_DSPControl_overflow_flag(env, 1, 20); + } + + return temp & 0x0000FFFF; +} + +static inline uint8_t mipsdsp_sub_u8(CPUMIPSState *env, uint8_t a, uint8_t b) +{ + uint8_t temp8; + uint16_t temp; + + temp = (uint16_t)a - (uint16_t)b; + temp8 = (temp >> 8) & 0x01; + if (temp8 == 1) { + set_DSPControl_overflow_flag(env, 1, 20); + } + + return temp & 0x00FF; +} + +static inline uint8_t mipsdsp_satu8_sub(CPUMIPSState *env, uint8_t a, uint8_t b) +{ + uint8_t temp8; + uint16_t temp; + + temp = (uint16_t)a - (uint16_t)b; + temp8 = (temp >> 8) & 0x01; + if (temp8 == 1) { + temp = 0x00; + set_DSPControl_overflow_flag(env, 1, 20); + } + + return temp & 0x00FF; +} + +static inline uint32_t mipsdsp_sub32(CPUMIPSState *env, int32_t a, int32_t b) +{ + uint32_t temp32, temp31; + int64_t temp; + + temp = (int64_t)a - (int64_t)b; + temp32 = (temp >> 32) & 0x01; + temp31 = (temp >> 31) & 0x01; + if (temp32 != temp31) { + set_DSPControl_overflow_flag(env, 1, 20); + } + + return temp & 0xFFFFFFFF; +} + +static inline int32_t mipsdsp_add_i32(CPUMIPSState *env, int32_t a, int32_t b) +{ + int32_t temp32, temp31; + int64_t temp; + + temp = (int64_t)a + (int64_t)b; + + temp32 = (temp >> 32) & 0x01; + temp31 = (temp >> 31) & 0x01; + if (temp32 != temp31) { + set_DSPControl_overflow_flag(env, 1, 20); + } + + return temp & 0xFFFFFFFF; +} + +static inline int32_t mipsdsp_cmp_eq(uint32_t a, uint32_t b) +{ + return a == b; +} + +static inline int32_t mipsdsp_cmp_le(uint32_t a, uint32_t b) +{ + return a <= b; +} + +static inline int32_t mipsdsp_cmp_lt(uint32_t a, uint32_t b) +{ + return a < b; +} +/*** MIPS DSP internal functions end ***/ -- 1.7.9.5
