… | |
… | |
40 | |
40 | |
41 | #ifndef ECB_H |
41 | #ifndef ECB_H |
42 | #define ECB_H |
42 | #define ECB_H |
43 | |
43 | |
44 | /* 16 bits major, 16 bits minor */ |
44 | /* 16 bits major, 16 bits minor */ |
45 | #define ECB_VERSION 0x00010004 |
45 | #define ECB_VERSION 0x00010005 |
46 | |
46 | |
47 | #ifdef _WIN32 |
47 | #ifdef _WIN32 |
48 | typedef signed char int8_t; |
48 | typedef signed char int8_t; |
49 | typedef unsigned char uint8_t; |
49 | typedef unsigned char uint8_t; |
50 | typedef signed short int16_t; |
50 | typedef signed short int16_t; |
… | |
… | |
67 | typedef uint32_t uintptr_t; |
67 | typedef uint32_t uintptr_t; |
68 | typedef int32_t intptr_t; |
68 | typedef int32_t intptr_t; |
69 | #endif |
69 | #endif |
70 | #else |
70 | #else |
71 | #include <inttypes.h> |
71 | #include <inttypes.h> |
72 | #if UINTMAX_MAX > 0xffffffffU |
72 | #if (defined INTPTR_MAX ? INTPTR_MAX : ULONG_MAX) > 0xffffffffU |
73 | #define ECB_PTRSIZE 8 |
73 | #define ECB_PTRSIZE 8 |
74 | #else |
74 | #else |
75 | #define ECB_PTRSIZE 4 |
75 | #define ECB_PTRSIZE 4 |
76 | #endif |
76 | #endif |
77 | #endif |
77 | #endif |
… | |
… | |
115 | #define ECB_CLANG_EXTENSION(x) 0 |
115 | #define ECB_CLANG_EXTENSION(x) 0 |
116 | #endif |
116 | #endif |
117 | |
117 | |
118 | #define ECB_CPP (__cplusplus+0) |
118 | #define ECB_CPP (__cplusplus+0) |
119 | #define ECB_CPP11 (__cplusplus >= 201103L) |
119 | #define ECB_CPP11 (__cplusplus >= 201103L) |
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120 | #define ECB_CPP14 (__cplusplus >= 201402L) |
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|
121 | #define ECB_CPP17 (__cplusplus >= 201703L) |
120 | |
122 | |
121 | #if ECB_CPP |
123 | #if ECB_CPP |
122 | #define ECB_C 0 |
124 | #define ECB_C 0 |
123 | #define ECB_STDC_VERSION 0 |
125 | #define ECB_STDC_VERSION 0 |
124 | #else |
126 | #else |
… | |
… | |
126 | #define ECB_STDC_VERSION __STDC_VERSION__ |
128 | #define ECB_STDC_VERSION __STDC_VERSION__ |
127 | #endif |
129 | #endif |
128 | |
130 | |
129 | #define ECB_C99 (ECB_STDC_VERSION >= 199901L) |
131 | #define ECB_C99 (ECB_STDC_VERSION >= 199901L) |
130 | #define ECB_C11 (ECB_STDC_VERSION >= 201112L) |
132 | #define ECB_C11 (ECB_STDC_VERSION >= 201112L) |
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|
133 | #define ECB_C17 (ECB_STDC_VERSION >= 201710L) |
131 | |
134 | |
132 | #if ECB_CPP |
135 | #if ECB_CPP |
133 | #define ECB_EXTERN_C extern "C" |
136 | #define ECB_EXTERN_C extern "C" |
134 | #define ECB_EXTERN_C_BEG ECB_EXTERN_C { |
137 | #define ECB_EXTERN_C_BEG ECB_EXTERN_C { |
135 | #define ECB_EXTERN_C_END } |
138 | #define ECB_EXTERN_C_END } |
… | |
… | |
153 | #endif |
156 | #endif |
154 | |
157 | |
155 | /* http://www-01.ibm.com/support/knowledgecenter/SSGH3R_13.1.0/com.ibm.xlcpp131.aix.doc/compiler_ref/compiler_builtins.html */ |
158 | /* http://www-01.ibm.com/support/knowledgecenter/SSGH3R_13.1.0/com.ibm.xlcpp131.aix.doc/compiler_ref/compiler_builtins.html */ |
156 | #if __xlC__ && ECB_CPP |
159 | #if __xlC__ && ECB_CPP |
157 | #include <builtins.h> |
160 | #include <builtins.h> |
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161 | #endif |
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162 | |
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163 | #if 1400 <= _MSC_VER |
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164 | #include <intrin.h> /* fence functions _ReadBarrier, also bit search functions _BitScanReverse */ |
158 | #endif |
165 | #endif |
159 | |
166 | |
160 | #ifndef ECB_MEMORY_FENCE |
167 | #ifndef ECB_MEMORY_FENCE |
161 | #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110 |
168 | #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110 |
162 | #if __i386 || __i386__ |
169 | #if __i386 || __i386__ |
163 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory") |
170 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory") |
164 | #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory") |
171 | #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory") |
165 | #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("") |
172 | #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("" : : : "memory") |
166 | #elif ECB_GCC_AMD64 |
173 | #elif ECB_GCC_AMD64 |
167 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory") |
174 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory") |
168 | #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory") |
175 | #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory") |
169 | #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("") |
176 | #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("" : : : "memory") |
170 | #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ |
177 | #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ |
171 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory") |
178 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory") |
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179 | #elif defined __ARM_ARCH_2__ \ |
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180 | || defined __ARM_ARCH_3__ || defined __ARM_ARCH_3M__ \ |
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181 | || defined __ARM_ARCH_4__ || defined __ARM_ARCH_4T__ \ |
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182 | || defined __ARM_ARCH_5__ || defined __ARM_ARCH_5E__ \ |
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183 | || defined __ARM_ARCH_5T__ || defined __ARM_ARCH_5TE__ \ |
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184 | || defined __ARM_ARCH_5TEJ__ |
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185 | /* should not need any, unless running old code on newer cpu - arm doesn't support that */ |
172 | #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \ |
186 | #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \ |
173 | || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__ |
187 | || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__ \ |
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188 | || defined __ARM_ARCH_6T2__ |
174 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory") |
189 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory") |
175 | #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \ |
190 | #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \ |
176 | || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__ |
191 | || defined __ARM_ARCH_7R__ || defined __ARM_ARCH_7M__ |
177 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory") |
192 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory") |
178 | #elif __aarch64__ |
193 | #elif __aarch64__ |
179 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb ish" : : : "memory") |
194 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb ish" : : : "memory") |
180 | #elif (__sparc || __sparc__) && !(__sparc_v8__ || defined __sparcv8) |
195 | #elif (__sparc || __sparc__) && !(__sparc_v8__ || defined __sparcv8) |
181 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory") |
196 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory") |
… | |
… | |
423 | #else |
438 | #else |
424 | ecb_function_ ecb_const int ecb_ctz32 (uint32_t x); |
439 | ecb_function_ ecb_const int ecb_ctz32 (uint32_t x); |
425 | ecb_function_ ecb_const int |
440 | ecb_function_ ecb_const int |
426 | ecb_ctz32 (uint32_t x) |
441 | ecb_ctz32 (uint32_t x) |
427 | { |
442 | { |
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443 | #if 1400 <= _MSC_VER && (_M_IX86 || _M_X64 || _M_IA64 || _M_ARM) |
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444 | unsigned long r; |
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|
445 | _BitScanForward (&r, x); |
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446 | return (int)r; |
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447 | #else |
428 | int r = 0; |
448 | int r = 0; |
429 | |
449 | |
430 | x &= ~x + 1; /* this isolates the lowest bit */ |
450 | x &= ~x + 1; /* this isolates the lowest bit */ |
431 | |
451 | |
432 | #if ECB_branchless_on_i386 |
452 | #if ECB_branchless_on_i386 |
… | |
… | |
442 | if (x & 0xff00ff00) r += 8; |
462 | if (x & 0xff00ff00) r += 8; |
443 | if (x & 0xffff0000) r += 16; |
463 | if (x & 0xffff0000) r += 16; |
444 | #endif |
464 | #endif |
445 | |
465 | |
446 | return r; |
466 | return r; |
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|
467 | #endif |
447 | } |
468 | } |
448 | |
469 | |
449 | ecb_function_ ecb_const int ecb_ctz64 (uint64_t x); |
470 | ecb_function_ ecb_const int ecb_ctz64 (uint64_t x); |
450 | ecb_function_ ecb_const int |
471 | ecb_function_ ecb_const int |
451 | ecb_ctz64 (uint64_t x) |
472 | ecb_ctz64 (uint64_t x) |
452 | { |
473 | { |
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474 | #if 1400 <= _MSC_VER && (_M_X64 || _M_IA64 || _M_ARM) |
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475 | unsigned long r; |
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476 | _BitScanForward64 (&r, x); |
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477 | return (int)r; |
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478 | #else |
453 | int shift = x & 0xffffffffU ? 0 : 32; |
479 | int shift = x & 0xffffffff ? 0 : 32; |
454 | return ecb_ctz32 (x >> shift) + shift; |
480 | return ecb_ctz32 (x >> shift) + shift; |
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481 | #endif |
455 | } |
482 | } |
456 | |
483 | |
457 | ecb_function_ ecb_const int ecb_popcount32 (uint32_t x); |
484 | ecb_function_ ecb_const int ecb_popcount32 (uint32_t x); |
458 | ecb_function_ ecb_const int |
485 | ecb_function_ ecb_const int |
459 | ecb_popcount32 (uint32_t x) |
486 | ecb_popcount32 (uint32_t x) |
… | |
… | |
467 | } |
494 | } |
468 | |
495 | |
469 | ecb_function_ ecb_const int ecb_ld32 (uint32_t x); |
496 | ecb_function_ ecb_const int ecb_ld32 (uint32_t x); |
470 | ecb_function_ ecb_const int ecb_ld32 (uint32_t x) |
497 | ecb_function_ ecb_const int ecb_ld32 (uint32_t x) |
471 | { |
498 | { |
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499 | #if 1400 <= _MSC_VER && (_M_IX86 || _M_X64 || _M_IA64 || _M_ARM) |
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500 | unsigned long r; |
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501 | _BitScanReverse (&r, x); |
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502 | return (int)r; |
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503 | #else |
472 | int r = 0; |
504 | int r = 0; |
473 | |
505 | |
474 | if (x >> 16) { x >>= 16; r += 16; } |
506 | if (x >> 16) { x >>= 16; r += 16; } |
475 | if (x >> 8) { x >>= 8; r += 8; } |
507 | if (x >> 8) { x >>= 8; r += 8; } |
476 | if (x >> 4) { x >>= 4; r += 4; } |
508 | if (x >> 4) { x >>= 4; r += 4; } |
477 | if (x >> 2) { x >>= 2; r += 2; } |
509 | if (x >> 2) { x >>= 2; r += 2; } |
478 | if (x >> 1) { r += 1; } |
510 | if (x >> 1) { r += 1; } |
479 | |
511 | |
480 | return r; |
512 | return r; |
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513 | #endif |
481 | } |
514 | } |
482 | |
515 | |
483 | ecb_function_ ecb_const int ecb_ld64 (uint64_t x); |
516 | ecb_function_ ecb_const int ecb_ld64 (uint64_t x); |
484 | ecb_function_ ecb_const int ecb_ld64 (uint64_t x) |
517 | ecb_function_ ecb_const int ecb_ld64 (uint64_t x) |
485 | { |
518 | { |
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519 | #if 1400 <= _MSC_VER && (_M_X64 || _M_IA64 || _M_ARM) |
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520 | unsigned long r; |
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521 | _BitScanReverse64 (&r, x); |
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522 | return (int)r; |
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523 | #else |
486 | int r = 0; |
524 | int r = 0; |
487 | |
525 | |
488 | if (x >> 32) { x >>= 32; r += 32; } |
526 | if (x >> 32) { x >>= 32; r += 32; } |
489 | |
527 | |
490 | return r + ecb_ld32 (x); |
528 | return r + ecb_ld32 (x); |
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|
529 | #endif |
491 | } |
530 | } |
492 | #endif |
531 | #endif |
493 | |
532 | |
494 | ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x); |
533 | ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x); |
495 | ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); } |
534 | ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); } |
… | |
… | |
598 | #endif |
637 | #endif |
599 | |
638 | |
600 | /* try to tell the compiler that some condition is definitely true */ |
639 | /* try to tell the compiler that some condition is definitely true */ |
601 | #define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0 |
640 | #define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0 |
602 | |
641 | |
603 | ecb_inline ecb_const unsigned char ecb_byteorder_helper (void); |
642 | ecb_inline ecb_const uint32_t ecb_byteorder_helper (void); |
604 | ecb_inline ecb_const unsigned char |
643 | ecb_inline ecb_const uint32_t |
605 | ecb_byteorder_helper (void) |
644 | ecb_byteorder_helper (void) |
606 | { |
645 | { |
607 | /* the union code still generates code under pressure in gcc, */ |
646 | /* the union code still generates code under pressure in gcc, */ |
608 | /* but less than using pointers, and always seems to */ |
647 | /* but less than using pointers, and always seems to */ |
609 | /* successfully return a constant. */ |
648 | /* successfully return a constant. */ |
610 | /* the reason why we have this horrible preprocessor mess */ |
649 | /* the reason why we have this horrible preprocessor mess */ |
611 | /* is to avoid it in all cases, at least on common architectures */ |
650 | /* is to avoid it in all cases, at least on common architectures */ |
612 | /* or when using a recent enough gcc version (>= 4.6) */ |
651 | /* or when using a recent enough gcc version (>= 4.6) */ |
613 | #if ((__i386 || __i386__) && !__VOS__) || _M_IX86 || ECB_GCC_AMD64 || ECB_MSVC_AMD64 |
|
|
614 | return 0x44; |
|
|
615 | #elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ |
652 | #if (defined __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__) \ |
|
|
653 | || ((__i386 || __i386__ || _M_IX86 || ECB_GCC_AMD64 || ECB_MSVC_AMD64) && !__VOS__) |
|
|
654 | #define ECB_LITTLE_ENDIAN 1 |
616 | return 0x44; |
655 | return 0x44332211; |
617 | #elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ |
656 | #elif (defined __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__) \ |
|
|
657 | || ((__AARCH64EB__ || __MIPSEB__ || __ARMEB__) && !__VOS__) |
|
|
658 | #define ECB_BIG_ENDIAN 1 |
618 | return 0x11; |
659 | return 0x11223344; |
619 | #else |
660 | #else |
620 | union |
661 | union |
621 | { |
662 | { |
|
|
663 | uint8_t c[4]; |
622 | uint32_t i; |
664 | uint32_t u; |
623 | uint8_t c; |
|
|
624 | } u = { 0x11223344 }; |
665 | } u = { 0x11, 0x22, 0x33, 0x44 }; |
625 | return u.c; |
666 | return u.u; |
626 | #endif |
667 | #endif |
627 | } |
668 | } |
628 | |
669 | |
629 | ecb_inline ecb_const ecb_bool ecb_big_endian (void); |
670 | ecb_inline ecb_const ecb_bool ecb_big_endian (void); |
630 | ecb_inline ecb_const ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; } |
671 | ecb_inline ecb_const ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11223344; } |
631 | ecb_inline ecb_const ecb_bool ecb_little_endian (void); |
672 | ecb_inline ecb_const ecb_bool ecb_little_endian (void); |
632 | ecb_inline ecb_const ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; } |
673 | ecb_inline ecb_const ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44332211; } |
633 | |
674 | |
634 | #if ECB_GCC_VERSION(3,0) || ECB_C99 |
675 | #if ECB_GCC_VERSION(3,0) || ECB_C99 |
635 | #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0)) |
676 | #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0)) |
636 | #else |
677 | #else |
637 | #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n))) |
678 | #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n))) |
… | |
… | |
661 | return N; |
702 | return N; |
662 | } |
703 | } |
663 | #else |
704 | #else |
664 | #define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) |
705 | #define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) |
665 | #endif |
706 | #endif |
|
|
707 | |
|
|
708 | ecb_function_ ecb_const uint32_t ecb_binary16_to_binary32 (uint32_t x); |
|
|
709 | ecb_function_ ecb_const uint32_t |
|
|
710 | ecb_binary16_to_binary32 (uint32_t x) |
|
|
711 | { |
|
|
712 | unsigned int s = (x & 0x8000) << (31 - 15); |
|
|
713 | int e = (x >> 10) & 0x001f; |
|
|
714 | unsigned int m = x & 0x03ff; |
|
|
715 | |
|
|
716 | if (ecb_expect_false (e == 31)) |
|
|
717 | /* infinity or NaN */ |
|
|
718 | e = 255 - (127 - 15); |
|
|
719 | else if (ecb_expect_false (!e)) |
|
|
720 | { |
|
|
721 | if (ecb_expect_true (!m)) |
|
|
722 | /* zero, handled by code below by forcing e to 0 */ |
|
|
723 | e = 0 - (127 - 15); |
|
|
724 | else |
|
|
725 | { |
|
|
726 | /* subnormal, renormalise */ |
|
|
727 | unsigned int s = 10 - ecb_ld32 (m); |
|
|
728 | |
|
|
729 | m = (m << s) & 0x3ff; /* mask implicit bit */ |
|
|
730 | e -= s - 1; |
|
|
731 | } |
|
|
732 | } |
|
|
733 | |
|
|
734 | /* e and m now are normalised, or zero, (or inf or nan) */ |
|
|
735 | e += 127 - 15; |
|
|
736 | |
|
|
737 | return s | (e << 23) | (m << (23 - 10)); |
|
|
738 | } |
|
|
739 | |
|
|
740 | ecb_function_ ecb_const uint16_t ecb_binary32_to_binary16 (uint32_t x); |
|
|
741 | ecb_function_ ecb_const uint16_t |
|
|
742 | ecb_binary32_to_binary16 (uint32_t x) |
|
|
743 | { |
|
|
744 | unsigned int s = (x >> 16) & 0x00008000; /* sign bit, the easy part */ |
|
|
745 | unsigned int e = ((x >> 23) & 0x000000ff) - (127 - 15); /* the desired exponent */ |
|
|
746 | unsigned int m = x & 0x007fffff; |
|
|
747 | |
|
|
748 | x &= 0x7fffffff; |
|
|
749 | |
|
|
750 | /* if it's within range of binary16 normals, use fast path */ |
|
|
751 | if (ecb_expect_true (0x38800000 <= x && x <= 0x477fefff)) |
|
|
752 | { |
|
|
753 | /* mantissa round-to-even */ |
|
|
754 | m += 0x00000fff + ((m >> (23 - 10)) & 1); |
|
|
755 | |
|
|
756 | /* handle overflow */ |
|
|
757 | if (ecb_expect_false (m >= 0x00800000)) |
|
|
758 | { |
|
|
759 | m >>= 1; |
|
|
760 | e += 1; |
|
|
761 | } |
|
|
762 | |
|
|
763 | return s | (e << 10) | (m >> (23 - 10)); |
|
|
764 | } |
|
|
765 | |
|
|
766 | /* handle large numbers and infinity */ |
|
|
767 | if (ecb_expect_true (0x477fefff < x && x <= 0x7f800000)) |
|
|
768 | return s | 0x7c00; |
|
|
769 | |
|
|
770 | /* handle zero, subnormals and small numbers */ |
|
|
771 | if (ecb_expect_true (x < 0x38800000)) |
|
|
772 | { |
|
|
773 | /* zero */ |
|
|
774 | if (ecb_expect_true (!x)) |
|
|
775 | return s; |
|
|
776 | |
|
|
777 | /* handle subnormals */ |
|
|
778 | |
|
|
779 | /* too small, will be zero */ |
|
|
780 | if (e < (14 - 24)) /* might not be sharp, but is good enough */ |
|
|
781 | return s; |
|
|
782 | |
|
|
783 | m |= 0x00800000; /* make implicit bit explicit */ |
|
|
784 | |
|
|
785 | /* very tricky - we need to round to the nearest e (+10) bit value */ |
|
|
786 | { |
|
|
787 | unsigned int bits = 14 - e; |
|
|
788 | unsigned int half = (1 << (bits - 1)) - 1; |
|
|
789 | unsigned int even = (m >> bits) & 1; |
|
|
790 | |
|
|
791 | /* if this overflows, we will end up with a normalised number */ |
|
|
792 | m = (m + half + even) >> bits; |
|
|
793 | } |
|
|
794 | |
|
|
795 | return s | m; |
|
|
796 | } |
|
|
797 | |
|
|
798 | /* handle NaNs, preserve leftmost nan bits, but make sure we don't turn them into infinities */ |
|
|
799 | m >>= 13; |
|
|
800 | |
|
|
801 | return s | 0x7c00 | m | !m; |
|
|
802 | } |
666 | |
803 | |
667 | /*******************************************************************************/ |
804 | /*******************************************************************************/ |
668 | /* floating point stuff, can be disabled by defining ECB_NO_LIBM */ |
805 | /* floating point stuff, can be disabled by defining ECB_NO_LIBM */ |
669 | |
806 | |
670 | /* basically, everything uses "ieee pure-endian" floating point numbers */ |
807 | /* basically, everything uses "ieee pure-endian" floating point numbers */ |
… | |
… | |
713 | #else |
850 | #else |
714 | #define ecb_ldexpf(x,e) (float) ldexp ((double) (x), (e)) |
851 | #define ecb_ldexpf(x,e) (float) ldexp ((double) (x), (e)) |
715 | #define ecb_frexpf(x,e) (float) frexp ((double) (x), (e)) |
852 | #define ecb_frexpf(x,e) (float) frexp ((double) (x), (e)) |
716 | #endif |
853 | #endif |
717 | |
854 | |
718 | /* converts an ieee half/binary16 to a float */ |
|
|
719 | ecb_function_ ecb_const float ecb_binary16_to_float (uint16_t x); |
|
|
720 | ecb_function_ ecb_const float |
|
|
721 | ecb_binary16_to_float (uint16_t x) |
|
|
722 | { |
|
|
723 | int e = (x >> 10) & 0x1f; |
|
|
724 | int m = x & 0x3ff; |
|
|
725 | float r; |
|
|
726 | |
|
|
727 | if (!e ) r = ecb_ldexpf (m , -24); |
|
|
728 | else if (e != 31) r = ecb_ldexpf (m + 0x400, e - 25); |
|
|
729 | else if (m ) r = ECB_NAN; |
|
|
730 | else r = ECB_INFINITY; |
|
|
731 | |
|
|
732 | return x & 0x8000 ? -r : r; |
|
|
733 | } |
|
|
734 | |
|
|
735 | /* convert a float to ieee single/binary32 */ |
855 | /* convert a float to ieee single/binary32 */ |
736 | ecb_function_ ecb_const uint32_t ecb_float_to_binary32 (float x); |
856 | ecb_function_ ecb_const uint32_t ecb_float_to_binary32 (float x); |
737 | ecb_function_ ecb_const uint32_t |
857 | ecb_function_ ecb_const uint32_t |
738 | ecb_float_to_binary32 (float x) |
858 | ecb_float_to_binary32 (float x) |
739 | { |
859 | { |
… | |
… | |
870 | #endif |
990 | #endif |
871 | |
991 | |
872 | return r; |
992 | return r; |
873 | } |
993 | } |
874 | |
994 | |
875 | #endif |
995 | /* convert a float to ieee half/binary16 */ |
|
|
996 | ecb_function_ ecb_const uint16_t ecb_float_to_binary16 (float x); |
|
|
997 | ecb_function_ ecb_const uint16_t |
|
|
998 | ecb_float_to_binary16 (float x) |
|
|
999 | { |
|
|
1000 | return ecb_binary32_to_binary16 (ecb_float_to_binary32 (x)); |
|
|
1001 | } |
876 | |
1002 | |
877 | #endif |
1003 | /* convert an ieee half/binary16 to float */ |
|
|
1004 | ecb_function_ ecb_const float ecb_binary16_to_float (uint16_t x); |
|
|
1005 | ecb_function_ ecb_const float |
|
|
1006 | ecb_binary16_to_float (uint16_t x) |
|
|
1007 | { |
|
|
1008 | return ecb_binary32_to_float (ecb_binary16_to_binary32 (x)); |
|
|
1009 | } |
878 | |
1010 | |
|
|
1011 | #endif |
|
|
1012 | |
|
|
1013 | #endif |
|
|
1014 | |