/* * M-profile MVE Operations * * Copyright (c) 2021 Linaro, Ltd. * * 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 2.1 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 . */ #include "qemu/osdep.h" #include "cpu.h" #include "internals.h" #include "vec_internal.h" #include "exec/helper-proto.h" #include "exec/cpu_ldst.h" #include "exec/exec-all.h" #include "tcg/tcg.h" static uint16_t mve_element_mask(CPUARMState *env) { /* * Return the mask of which elements in the MVE vector should be * updated. This is a combination of multiple things: * (1) by default, we update every lane in the vector * (2) VPT predication stores its state in the VPR register; * (3) low-overhead-branch tail predication will mask out part * the vector on the final iteration of the loop * (4) if EPSR.ECI is set then we must execute only some beats * of the insn * We combine all these into a 16-bit result with the same semantics * as VPR.P0: 0 to mask the lane, 1 if it is active. * 8-bit vector ops will look at all bits of the result; * 16-bit ops will look at bits 0, 2, 4, ...; * 32-bit ops will look at bits 0, 4, 8 and 12. * Compare pseudocode GetCurInstrBeat(), though that only returns * the 4-bit slice of the mask corresponding to a single beat. */ uint16_t mask = FIELD_EX32(env->v7m.vpr, V7M_VPR, P0); if (!(env->v7m.vpr & R_V7M_VPR_MASK01_MASK)) { mask |= 0xff; } if (!(env->v7m.vpr & R_V7M_VPR_MASK23_MASK)) { mask |= 0xff00; } if (env->v7m.ltpsize < 4 && env->regs[14] <= (1 << (4 - env->v7m.ltpsize))) { /* * Tail predication active, and this is the last loop iteration. * The element size is (1 << ltpsize), and we only want to process * loopcount elements, so we want to retain the least significant * (loopcount * esize) predicate bits and zero out bits above that. */ int masklen = env->regs[14] << env->v7m.ltpsize; assert(masklen <= 16); mask &= MAKE_64BIT_MASK(0, masklen); } if ((env->condexec_bits & 0xf) == 0) { /* * ECI bits indicate which beats are already executed; * we handle this by effectively predicating them out. */ int eci = env->condexec_bits >> 4; switch (eci) { case ECI_NONE: break; case ECI_A0: mask &= 0xfff0; break; case ECI_A0A1: mask &= 0xff00; break; case ECI_A0A1A2: case ECI_A0A1A2B0: mask &= 0xf000; break; default: g_assert_not_reached(); } } return mask; } static void mve_advance_vpt(CPUARMState *env) { /* Advance the VPT and ECI state if necessary */ uint32_t vpr = env->v7m.vpr; unsigned mask01, mask23; if ((env->condexec_bits & 0xf) == 0) { env->condexec_bits = (env->condexec_bits == (ECI_A0A1A2B0 << 4)) ? (ECI_A0 << 4) : (ECI_NONE << 4); } if (!(vpr & (R_V7M_VPR_MASK01_MASK | R_V7M_VPR_MASK23_MASK))) { /* VPT not enabled, nothing to do */ return; } mask01 = FIELD_EX32(vpr, V7M_VPR, MASK01); mask23 = FIELD_EX32(vpr, V7M_VPR, MASK23); if (mask01 > 8) { /* high bit set, but not 0b1000: invert the relevant half of P0 */ vpr ^= 0xff; } if (mask23 > 8) { /* high bit set, but not 0b1000: invert the relevant half of P0 */ vpr ^= 0xff00; } vpr = FIELD_DP32(vpr, V7M_VPR, MASK01, mask01 << 1); vpr = FIELD_DP32(vpr, V7M_VPR, MASK23, mask23 << 1); env->v7m.vpr = vpr; } #define DO_VLDR(OP, MSIZE, LDTYPE, ESIZE, TYPE) \ void HELPER(mve_##OP)(CPUARMState *env, void *vd, uint32_t addr) \ { \ TYPE *d = vd; \ uint16_t mask = mve_element_mask(env); \ unsigned b, e; \ /* \ * R_SXTM allows the dest reg to become UNKNOWN for abandoned \ * beats so we don't care if we update part of the dest and \ * then take an exception. \ */ \ for (b = 0, e = 0; b < 16; b += ESIZE, e++) { \ if (mask & (1 << b)) { \ d[H##ESIZE(e)] = cpu_##LDTYPE##_data_ra(env, addr, GETPC()); \ } \ addr += MSIZE; \ } \ mve_advance_vpt(env); \ } #define DO_VSTR(OP, MSIZE, STTYPE, ESIZE, TYPE) \ void HELPER(mve_##OP)(CPUARMState *env, void *vd, uint32_t addr) \ { \ TYPE *d = vd; \ uint16_t mask = mve_element_mask(env); \ unsigned b, e; \ for (b = 0, e = 0; b < 16; b += ESIZE, e++) { \ if (mask & (1 << b)) { \ cpu_##STTYPE##_data_ra(env, addr, d[H##ESIZE(e)], GETPC()); \ } \ addr += MSIZE; \ } \ mve_advance_vpt(env); \ } DO_VLDR(vldrb, 1, ldub, 1, uint8_t) DO_VLDR(vldrh, 2, lduw, 2, uint16_t) DO_VLDR(vldrw, 4, ldl, 4, uint32_t) DO_VSTR(vstrb, 1, stb, 1, uint8_t) DO_VSTR(vstrh, 2, stw, 2, uint16_t) DO_VSTR(vstrw, 4, stl, 4, uint32_t) DO_VLDR(vldrb_sh, 1, ldsb, 2, int16_t) DO_VLDR(vldrb_sw, 1, ldsb, 4, int32_t) DO_VLDR(vldrb_uh, 1, ldub, 2, uint16_t) DO_VLDR(vldrb_uw, 1, ldub, 4, uint32_t) DO_VLDR(vldrh_sw, 2, ldsw, 4, int32_t) DO_VLDR(vldrh_uw, 2, lduw, 4, uint32_t) DO_VSTR(vstrb_h, 1, stb, 2, int16_t) DO_VSTR(vstrb_w, 1, stb, 4, int32_t) DO_VSTR(vstrh_w, 2, stw, 4, int32_t) #undef DO_VLDR #undef DO_VSTR /* * The mergemask(D, R, M) macro performs the operation "*D = R" but * storing only the bytes which correspond to 1 bits in M, * leaving other bytes in *D unchanged. We use _Generic * to select the correct implementation based on the type of D. */ static void mergemask_ub(uint8_t *d, uint8_t r, uint16_t mask) { if (mask & 1) { *d = r; } } static void mergemask_sb(int8_t *d, int8_t r, uint16_t mask) { mergemask_ub((uint8_t *)d, r, mask); } static void mergemask_uh(uint16_t *d, uint16_t r, uint16_t mask) { uint16_t bmask = expand_pred_b_data[mask & 3]; *d = (*d & ~bmask) | (r & bmask); } static void mergemask_sh(int16_t *d, int16_t r, uint16_t mask) { mergemask_uh((uint16_t *)d, r, mask); } static void mergemask_uw(uint32_t *d, uint32_t r, uint16_t mask) { uint32_t bmask = expand_pred_b_data[mask & 0xf]; *d = (*d & ~bmask) | (r & bmask); } static void mergemask_sw(int32_t *d, int32_t r, uint16_t mask) { mergemask_uw((uint32_t *)d, r, mask); } static void mergemask_uq(uint64_t *d, uint64_t r, uint16_t mask) { uint64_t bmask = expand_pred_b_data[mask & 0xff]; *d = (*d & ~bmask) | (r & bmask); } static void mergemask_sq(int64_t *d, int64_t r, uint16_t mask) { mergemask_uq((uint64_t *)d, r, mask); } #define mergemask(D, R, M) \ _Generic(D, \ uint8_t *: mergemask_ub, \ int8_t *: mergemask_sb, \ uint16_t *: mergemask_uh, \ int16_t *: mergemask_sh, \ uint32_t *: mergemask_uw, \ int32_t *: mergemask_sw, \ uint64_t *: mergemask_uq, \ int64_t *: mergemask_sq)(D, R, M) void HELPER(mve_vdup)(CPUARMState *env, void *vd, uint32_t val) { /* * The generated code already replicated an 8 or 16 bit constant * into the 32-bit value, so we only need to write the 32-bit * value to all elements of the Qreg, allowing for predication. */ uint32_t *d = vd; uint16_t mask = mve_element_mask(env); unsigned e; for (e = 0; e < 16 / 4; e++, mask >>= 4) { mergemask(&d[H4(e)], val, mask); } mve_advance_vpt(env); } #define DO_1OP(OP, ESIZE, TYPE, FN) \ void HELPER(mve_##OP)(CPUARMState *env, void *vd, void *vm) \ { \ TYPE *d = vd, *m = vm; \ uint16_t mask = mve_element_mask(env); \ unsigned e; \ for (e = 0; e < 16 / ESIZE; e++, mask >>= ESIZE) { \ mergemask(&d[H##ESIZE(e)], FN(m[H##ESIZE(e)]), mask); \ } \ mve_advance_vpt(env); \ } #define DO_CLS_B(N) (clrsb32(N) - 24) #define DO_CLS_H(N) (clrsb32(N) - 16) DO_1OP(vclsb, 1, int8_t, DO_CLS_B) DO_1OP(vclsh, 2, int16_t, DO_CLS_H) DO_1OP(vclsw, 4, int32_t, clrsb32) #define DO_CLZ_B(N) (clz32(N) - 24) #define DO_CLZ_H(N) (clz32(N) - 16) DO_1OP(vclzb, 1, uint8_t, DO_CLZ_B) DO_1OP(vclzh, 2, uint16_t, DO_CLZ_H) DO_1OP(vclzw, 4, uint32_t, clz32) DO_1OP(vrev16b, 2, uint16_t, bswap16) DO_1OP(vrev32b, 4, uint32_t, bswap32) DO_1OP(vrev32h, 4, uint32_t, hswap32) DO_1OP(vrev64b, 8, uint64_t, bswap64) DO_1OP(vrev64h, 8, uint64_t, hswap64) DO_1OP(vrev64w, 8, uint64_t, wswap64) #define DO_NOT(N) (~(N)) DO_1OP(vmvn, 8, uint64_t, DO_NOT) #define DO_ABS(N) ((N) < 0 ? -(N) : (N)) #define DO_FABSH(N) ((N) & dup_const(MO_16, 0x7fff)) #define DO_FABSS(N) ((N) & dup_const(MO_32, 0x7fffffff)) DO_1OP(vabsb, 1, int8_t, DO_ABS) DO_1OP(vabsh, 2, int16_t, DO_ABS) DO_1OP(vabsw, 4, int32_t, DO_ABS) /* We can do these 64 bits at a time */ DO_1OP(vfabsh, 8, uint64_t, DO_FABSH) DO_1OP(vfabss, 8, uint64_t, DO_FABSS) #define DO_NEG(N) (-(N)) #define DO_FNEGH(N) ((N) ^ dup_const(MO_16, 0x8000)) #define DO_FNEGS(N) ((N) ^ dup_const(MO_32, 0x80000000)) DO_1OP(vnegb, 1, int8_t, DO_NEG) DO_1OP(vnegh, 2, int16_t, DO_NEG) DO_1OP(vnegw, 4, int32_t, DO_NEG) /* We can do these 64 bits at a time */ DO_1OP(vfnegh, 8, uint64_t, DO_FNEGH) DO_1OP(vfnegs, 8, uint64_t, DO_FNEGS) #define DO_2OP(OP, ESIZE, TYPE, FN) \ void HELPER(glue(mve_, OP))(CPUARMState *env, \ void *vd, void *vn, void *vm) \ { \ TYPE *d = vd, *n = vn, *m = vm; \ uint16_t mask = mve_element_mask(env); \ unsigned e; \ for (e = 0; e < 16 / ESIZE; e++, mask >>= ESIZE) { \ mergemask(&d[H##ESIZE(e)], \ FN(n[H##ESIZE(e)], m[H##ESIZE(e)]), mask); \ } \ mve_advance_vpt(env); \ } /* provide unsigned 2-op helpers for all sizes */ #define DO_2OP_U(OP, FN) \ DO_2OP(OP##b, 1, uint8_t, FN) \ DO_2OP(OP##h, 2, uint16_t, FN) \ DO_2OP(OP##w, 4, uint32_t, FN) /* provide signed 2-op helpers for all sizes */ #define DO_2OP_S(OP, FN) \ DO_2OP(OP##b, 1, int8_t, FN) \ DO_2OP(OP##h, 2, int16_t, FN) \ DO_2OP(OP##w, 4, int32_t, FN) /* * "Long" operations where two half-sized inputs (taken from either the * top or the bottom of the input vector) produce a double-width result. * Here ESIZE, TYPE are for the input, and LESIZE, LTYPE for the output. */ #define DO_2OP_L(OP, TOP, ESIZE, TYPE, LESIZE, LTYPE, FN) \ void HELPER(glue(mve_, OP))(CPUARMState *env, void *vd, void *vn, void *vm) \ { \ LTYPE *d = vd; \ TYPE *n = vn, *m = vm; \ uint16_t mask = mve_element_mask(env); \ unsigned le; \ for (le = 0; le < 16 / LESIZE; le++, mask >>= LESIZE) { \ LTYPE r = FN((LTYPE)n[H##ESIZE(le * 2 + TOP)], \ m[H##ESIZE(le * 2 + TOP)]); \ mergemask(&d[H##LESIZE(le)], r, mask); \ } \ mve_advance_vpt(env); \ } #define DO_AND(N, M) ((N) & (M)) #define DO_BIC(N, M) ((N) & ~(M)) #define DO_ORR(N, M) ((N) | (M)) #define DO_ORN(N, M) ((N) | ~(M)) #define DO_EOR(N, M) ((N) ^ (M)) DO_2OP(vand, 8, uint64_t, DO_AND) DO_2OP(vbic, 8, uint64_t, DO_BIC) DO_2OP(vorr, 8, uint64_t, DO_ORR) DO_2OP(vorn, 8, uint64_t, DO_ORN) DO_2OP(veor, 8, uint64_t, DO_EOR) #define DO_ADD(N, M) ((N) + (M)) #define DO_SUB(N, M) ((N) - (M)) #define DO_MUL(N, M) ((N) * (M)) DO_2OP_U(vadd, DO_ADD) DO_2OP_U(vsub, DO_SUB) DO_2OP_U(vmul, DO_MUL) DO_2OP_L(vmullbsb, 0, 1, int8_t, 2, int16_t, DO_MUL) DO_2OP_L(vmullbsh, 0, 2, int16_t, 4, int32_t, DO_MUL) DO_2OP_L(vmullbsw, 0, 4, int32_t, 8, int64_t, DO_MUL) DO_2OP_L(vmullbub, 0, 1, uint8_t, 2, uint16_t, DO_MUL) DO_2OP_L(vmullbuh, 0, 2, uint16_t, 4, uint32_t, DO_MUL) DO_2OP_L(vmullbuw, 0, 4, uint32_t, 8, uint64_t, DO_MUL) DO_2OP_L(vmulltsb, 1, 1, int8_t, 2, int16_t, DO_MUL) DO_2OP_L(vmulltsh, 1, 2, int16_t, 4, int32_t, DO_MUL) DO_2OP_L(vmulltsw, 1, 4, int32_t, 8, int64_t, DO_MUL) DO_2OP_L(vmulltub, 1, 1, uint8_t, 2, uint16_t, DO_MUL) DO_2OP_L(vmulltuh, 1, 2, uint16_t, 4, uint32_t, DO_MUL) DO_2OP_L(vmulltuw, 1, 4, uint32_t, 8, uint64_t, DO_MUL) /* * Because the computation type is at least twice as large as required, * these work for both signed and unsigned source types. */ static inline uint8_t do_mulh_b(int32_t n, int32_t m) { return (n * m) >> 8; } static inline uint16_t do_mulh_h(int32_t n, int32_t m) { return (n * m) >> 16; } static inline uint32_t do_mulh_w(int64_t n, int64_t m) { return (n * m) >> 32; } static inline uint8_t do_rmulh_b(int32_t n, int32_t m) { return (n * m + (1U << 7)) >> 8; } static inline uint16_t do_rmulh_h(int32_t n, int32_t m) { return (n * m + (1U << 15)) >> 16; } static inline uint32_t do_rmulh_w(int64_t n, int64_t m) { return (n * m + (1U << 31)) >> 32; } DO_2OP(vmulhsb, 1, int8_t, do_mulh_b) DO_2OP(vmulhsh, 2, int16_t, do_mulh_h) DO_2OP(vmulhsw, 4, int32_t, do_mulh_w) DO_2OP(vmulhub, 1, uint8_t, do_mulh_b) DO_2OP(vmulhuh, 2, uint16_t, do_mulh_h) DO_2OP(vmulhuw, 4, uint32_t, do_mulh_w) DO_2OP(vrmulhsb, 1, int8_t, do_rmulh_b) DO_2OP(vrmulhsh, 2, int16_t, do_rmulh_h) DO_2OP(vrmulhsw, 4, int32_t, do_rmulh_w) DO_2OP(vrmulhub, 1, uint8_t, do_rmulh_b) DO_2OP(vrmulhuh, 2, uint16_t, do_rmulh_h) DO_2OP(vrmulhuw, 4, uint32_t, do_rmulh_w) #define DO_MAX(N, M) ((N) >= (M) ? (N) : (M)) #define DO_MIN(N, M) ((N) >= (M) ? (M) : (N)) DO_2OP_S(vmaxs, DO_MAX) DO_2OP_U(vmaxu, DO_MAX) DO_2OP_S(vmins, DO_MIN) DO_2OP_U(vminu, DO_MIN) #define DO_ABD(N, M) ((N) >= (M) ? (N) - (M) : (M) - (N)) DO_2OP_S(vabds, DO_ABD) DO_2OP_U(vabdu, DO_ABD) static inline uint32_t do_vhadd_u(uint32_t n, uint32_t m) { return ((uint64_t)n + m) >> 1; } static inline int32_t do_vhadd_s(int32_t n, int32_t m) { return ((int64_t)n + m) >> 1; } static inline uint32_t do_vhsub_u(uint32_t n, uint32_t m) { return ((uint64_t)n - m) >> 1; } static inline int32_t do_vhsub_s(int32_t n, int32_t m) { return ((int64_t)n - m) >> 1; } DO_2OP_S(vhadds, do_vhadd_s) DO_2OP_U(vhaddu, do_vhadd_u) DO_2OP_S(vhsubs, do_vhsub_s) DO_2OP_U(vhsubu, do_vhsub_u) /* * Multiply add long dual accumulate ops. */ #define DO_LDAV(OP, ESIZE, TYPE, XCHG, EVENACC, ODDACC) \ uint64_t HELPER(glue(mve_, OP))(CPUARMState *env, void *vn, \ void *vm, uint64_t a) \ { \ uint16_t mask = mve_element_mask(env); \ unsigned e; \ TYPE *n = vn, *m = vm; \ for (e = 0; e < 16 / ESIZE; e++, mask >>= ESIZE) { \ if (mask & 1) { \ if (e & 1) { \ a ODDACC \ (int64_t)n[H##ESIZE(e - 1 * XCHG)] * m[H##ESIZE(e)]; \ } else { \ a EVENACC \ (int64_t)n[H##ESIZE(e + 1 * XCHG)] * m[H##ESIZE(e)]; \ } \ } \ } \ mve_advance_vpt(env); \ return a; \ } DO_LDAV(vmlaldavsh, 2, int16_t, false, +=, +=) DO_LDAV(vmlaldavxsh, 2, int16_t, true, +=, +=) DO_LDAV(vmlaldavsw, 4, int32_t, false, +=, +=) DO_LDAV(vmlaldavxsw, 4, int32_t, true, +=, +=) DO_LDAV(vmlaldavuh, 2, uint16_t, false, +=, +=) DO_LDAV(vmlaldavuw, 4, uint32_t, false, +=, +=) DO_LDAV(vmlsldavsh, 2, int16_t, false, +=, -=) DO_LDAV(vmlsldavxsh, 2, int16_t, true, +=, -=) DO_LDAV(vmlsldavsw, 4, int32_t, false, +=, -=) DO_LDAV(vmlsldavxsw, 4, int32_t, true, +=, -=)