| 1 | module ferp_simd |
| 2 | !> SIMD-accelerated scanning functions for FERP |
| 3 | !> Uses ARM NEON on Apple Silicon, scalar fallback otherwise |
| 4 | use, intrinsic :: iso_c_binding |
| 5 | implicit none |
| 6 | private |
| 7 | |
| 8 | public :: simd_find_char_ptr, simd_find_char2_ptr, simd_count_char_ptr |
| 9 | |
| 10 | interface |
| 11 | function c_simd_find_char(buf, len, start, needle) bind(C, name="simd_find_char") |
| 12 | import :: c_ptr, c_int64_t, c_char |
| 13 | type(c_ptr), value :: buf |
| 14 | integer(c_int64_t), value :: len |
| 15 | integer(c_int64_t), value :: start |
| 16 | character(c_char), value :: needle |
| 17 | integer(c_int64_t) :: c_simd_find_char |
| 18 | end function c_simd_find_char |
| 19 | |
| 20 | function c_simd_find_char2(buf, len, start, c1, c2) bind(C, name="simd_find_char2") |
| 21 | import :: c_ptr, c_int64_t, c_char |
| 22 | type(c_ptr), value :: buf |
| 23 | integer(c_int64_t), value :: len |
| 24 | integer(c_int64_t), value :: start |
| 25 | character(c_char), value :: c1 |
| 26 | character(c_char), value :: c2 |
| 27 | integer(c_int64_t) :: c_simd_find_char2 |
| 28 | end function c_simd_find_char2 |
| 29 | |
| 30 | function c_simd_count_char(buf, len, needle) bind(C, name="simd_count_char") |
| 31 | import :: c_ptr, c_int64_t, c_char |
| 32 | type(c_ptr), value :: buf |
| 33 | integer(c_int64_t), value :: len |
| 34 | character(c_char), value :: needle |
| 35 | integer(c_int64_t) :: c_simd_count_char |
| 36 | end function c_simd_count_char |
| 37 | end interface |
| 38 | |
| 39 | contains |
| 40 | |
| 41 | function simd_find_char_ptr(buf_ptr, buf_len, start, needle) result(pos) |
| 42 | !> Find first occurrence of needle starting at start (0-indexed C style) |
| 43 | !> Returns position (0-indexed) or -1 if not found |
| 44 | !> For use with mmap'd buffers |
| 45 | type(c_ptr), intent(in) :: buf_ptr |
| 46 | integer(c_int64_t), intent(in) :: buf_len |
| 47 | integer(c_int64_t), intent(in) :: start |
| 48 | character(len=1), intent(in) :: needle |
| 49 | integer(c_int64_t) :: pos |
| 50 | |
| 51 | character(kind=c_char) :: c_needle |
| 52 | |
| 53 | ! Convert to C char kind explicitly |
| 54 | c_needle = char(ichar(needle), kind=c_char) |
| 55 | pos = c_simd_find_char(buf_ptr, buf_len, start, c_needle) |
| 56 | end function simd_find_char_ptr |
| 57 | |
| 58 | function simd_find_char2_ptr(buf_ptr, buf_len, start, c1, c2) result(pos) |
| 59 | !> Find first occurrence of 2-char sequence (0-indexed) |
| 60 | !> Returns position (0-indexed) or -1 if not found |
| 61 | type(c_ptr), intent(in) :: buf_ptr |
| 62 | integer(c_int64_t), intent(in) :: buf_len |
| 63 | integer(c_int64_t), intent(in) :: start |
| 64 | character(len=1), intent(in) :: c1, c2 |
| 65 | integer(c_int64_t) :: pos |
| 66 | |
| 67 | character(kind=c_char) :: cc1, cc2 |
| 68 | |
| 69 | ! Convert to C char kind explicitly |
| 70 | cc1 = char(ichar(c1), kind=c_char) |
| 71 | cc2 = char(ichar(c2), kind=c_char) |
| 72 | pos = c_simd_find_char2(buf_ptr, buf_len, start, cc1, cc2) |
| 73 | end function simd_find_char2_ptr |
| 74 | |
| 75 | function simd_count_char_ptr(buf_ptr, buf_len, needle) result(count) |
| 76 | !> Count occurrences of needle in buffer |
| 77 | type(c_ptr), intent(in) :: buf_ptr |
| 78 | integer(c_int64_t), intent(in) :: buf_len |
| 79 | character(len=1), intent(in) :: needle |
| 80 | integer(c_int64_t) :: count |
| 81 | |
| 82 | character(kind=c_char) :: c_needle |
| 83 | |
| 84 | ! Convert to C char kind explicitly |
| 85 | c_needle = char(ichar(needle), kind=c_char) |
| 86 | count = c_simd_count_char(buf_ptr, buf_len, c_needle) |
| 87 | end function simd_count_char_ptr |
| 88 | |
| 89 | end module ferp_simd |
| 90 |