qemu

vec_internal.h (6850B)

---

 /*
  * ARM AdvSIMD / SVE Vector Helpers
  *
  * Copyright (c) 2020 Linaro
  *
  * 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 <http://www.gnu.org/licenses/>.
  */
 
 #ifndef TARGET_ARM_VEC_INTERNAL_H
 #define TARGET_ARM_VEC_INTERNAL_H
 
 /*
  * Note that vector data is stored in host-endian 64-bit chunks,
  * so addressing units smaller than that needs a host-endian fixup.
  *
  * The H<N> macros are used when indexing an array of elements of size N.
  *
  * The H1_<N> macros are used when performing byte arithmetic and then
  * casting the final pointer to a type of size N.
  */
 #if HOST_BIG_ENDIAN
 #define H1(x)   ((x) ^ 7)
 #define H1_2(x) ((x) ^ 6)
 #define H1_4(x) ((x) ^ 4)
 #define H2(x)   ((x) ^ 3)
 #define H4(x)   ((x) ^ 1)
 #else
 #define H1(x)   (x)
 #define H1_2(x) (x)
 #define H1_4(x) (x)
 #define H2(x)   (x)
 #define H4(x)   (x)
 #endif
 /*
  * Access to 64-bit elements isn't host-endian dependent; we provide H8
  * and H1_8 so that when a function is being generated from a macro we
  * can pass these rather than an empty macro argument, for clarity.
  */
 #define H8(x)   (x)
 #define H1_8(x) (x)
 
 /*
  * Expand active predicate bits to bytes, for byte elements.
  */
 extern const uint64_t expand_pred_b_data[256];
 static inline uint64_t expand_pred_b(uint8_t byte)
 {
     return expand_pred_b_data[byte];
 }
 
 /* Similarly for half-word elements. */
 extern const uint64_t expand_pred_h_data[0x55 + 1];
 static inline uint64_t expand_pred_h(uint8_t byte)
 {
     return expand_pred_h_data[byte & 0x55];
 }
 
 static inline void clear_tail(void *vd, uintptr_t opr_sz, uintptr_t max_sz)
 {
     uint64_t *d = vd + opr_sz;
     uintptr_t i;
 
     for (i = opr_sz; i < max_sz; i += 8) {
         *d++ = 0;
     }
 }
 
 static inline int32_t do_sqrshl_bhs(int32_t src, int32_t shift, int bits,
                                     bool round, uint32_t *sat)
 {
     if (shift <= -bits) {
         /* Rounding the sign bit always produces 0. */
         if (round) {
             return 0;
         }
         return src >> 31;
     } else if (shift < 0) {
         if (round) {
             src >>= -shift - 1;
             return (src >> 1) + (src & 1);
         }
         return src >> -shift;
     } else if (shift < bits) {
         int32_t val = src << shift;
         if (bits == 32) {
             if (!sat || val >> shift == src) {
                 return val;
             }
         } else {
             int32_t extval = sextract32(val, 0, bits);
             if (!sat || val == extval) {
                 return extval;
             }
         }
     } else if (!sat || src == 0) {
         return 0;
     }
 
     *sat = 1;
     return (1u << (bits - 1)) - (src >= 0);
 }
 
 static inline uint32_t do_uqrshl_bhs(uint32_t src, int32_t shift, int bits,
                                      bool round, uint32_t *sat)
 {
     if (shift <= -(bits + round)) {
         return 0;
     } else if (shift < 0) {
         if (round) {
             src >>= -shift - 1;
             return (src >> 1) + (src & 1);
         }
         return src >> -shift;
     } else if (shift < bits) {
         uint32_t val = src << shift;
         if (bits == 32) {
             if (!sat || val >> shift == src) {
                 return val;
             }
         } else {
             uint32_t extval = extract32(val, 0, bits);
             if (!sat || val == extval) {
                 return extval;
             }
         }
     } else if (!sat || src == 0) {
         return 0;
     }
 
     *sat = 1;
     return MAKE_64BIT_MASK(0, bits);
 }
 
 static inline int32_t do_suqrshl_bhs(int32_t src, int32_t shift, int bits,
                                      bool round, uint32_t *sat)
 {
     if (sat && src < 0) {
         *sat = 1;
         return 0;
     }
     return do_uqrshl_bhs(src, shift, bits, round, sat);
 }
 
 static inline int64_t do_sqrshl_d(int64_t src, int64_t shift,
                                   bool round, uint32_t *sat)
 {
     if (shift <= -64) {
         /* Rounding the sign bit always produces 0. */
         if (round) {
             return 0;
         }
         return src >> 63;
     } else if (shift < 0) {
         if (round) {
             src >>= -shift - 1;
             return (src >> 1) + (src & 1);
         }
         return src >> -shift;
     } else if (shift < 64) {
         int64_t val = src << shift;
         if (!sat || val >> shift == src) {
             return val;
         }
     } else if (!sat || src == 0) {
         return 0;
     }
 
     *sat = 1;
     return src < 0 ? INT64_MIN : INT64_MAX;
 }
 
 static inline uint64_t do_uqrshl_d(uint64_t src, int64_t shift,
                                    bool round, uint32_t *sat)
 {
     if (shift <= -(64 + round)) {
         return 0;
     } else if (shift < 0) {
         if (round) {
             src >>= -shift - 1;
             return (src >> 1) + (src & 1);
         }
         return src >> -shift;
     } else if (shift < 64) {
         uint64_t val = src << shift;
         if (!sat || val >> shift == src) {
             return val;
         }
     } else if (!sat || src == 0) {
         return 0;
     }
 
     *sat = 1;
     return UINT64_MAX;
 }
 
 static inline int64_t do_suqrshl_d(int64_t src, int64_t shift,
                                    bool round, uint32_t *sat)
 {
     if (sat && src < 0) {
         *sat = 1;
         return 0;
     }
     return do_uqrshl_d(src, shift, round, sat);
 }
 
 int8_t do_sqrdmlah_b(int8_t, int8_t, int8_t, bool, bool);
 int16_t do_sqrdmlah_h(int16_t, int16_t, int16_t, bool, bool, uint32_t *);
 int32_t do_sqrdmlah_s(int32_t, int32_t, int32_t, bool, bool, uint32_t *);
 int64_t do_sqrdmlah_d(int64_t, int64_t, int64_t, bool, bool);
 
 /*
  * 8 x 8 -> 16 vector polynomial multiply where the inputs are
  * in the low 8 bits of each 16-bit element
 */
 uint64_t pmull_h(uint64_t op1, uint64_t op2);
 /*
  * 16 x 16 -> 32 vector polynomial multiply where the inputs are
  * in the low 16 bits of each 32-bit element
  */
 uint64_t pmull_w(uint64_t op1, uint64_t op2);
 
 /**
  * bfdotadd:
  * @sum: addend
  * @e1, @e2: multiplicand vectors
  *
  * BFloat16 2-way dot product of @e1 & @e2, accumulating with @sum.
  * The @e1 and @e2 operands correspond to the 32-bit source vector
  * slots and contain two Bfloat16 values each.
  *
  * Corresponds to the ARM pseudocode function BFDotAdd.
  */
 float32 bfdotadd(float32 sum, uint32_t e1, uint32_t e2);
 
 #endif /* TARGET_ARM_VEC_INTERNAL_H */