diff options
Diffstat (limited to 'libnetdata/storage_number/storage_number.c')
| -rw-r--r-- | libnetdata/storage_number/storage_number.c | 142 |
1 files changed, 72 insertions, 70 deletions
diff --git a/libnetdata/storage_number/storage_number.c b/libnetdata/storage_number/storage_number.c index 7511f3a7..ebae71d8 100644 --- a/libnetdata/storage_number/storage_number.c +++ b/libnetdata/storage_number/storage_number.c @@ -2,6 +2,78 @@ #include "../libnetdata.h" +bool is_system_ieee754_double(void) { + static bool logged = false; + + struct { + NETDATA_DOUBLE original; + + union { + uint64_t i; + NETDATA_DOUBLE d; + }; + } tests[] = { + { .original = 1.25, .i = 0x3FF4000000000000 }, + { .original = 1.0, .i = 0x3FF0000000000000 }, + { .original = 2.0, .i = 0x4000000000000000 }, + { .original = 4.0, .i = 0x4010000000000000 }, + { .original = 8.8, .i = 0x402199999999999A }, + { .original = 16.16, .i = 0x403028F5C28F5C29 }, + { .original = 32.32, .i = 0x404028F5C28F5C29 }, + { .original = 64.64, .i = 0x405028F5C28F5C29 }, + { .original = 128.128, .i = 0x406004189374BC6A }, + { .original = 32768.32768, .i = 0x40E0000A7C5AC472 }, + { .original = 65536.65536, .i = 0x40F0000A7C5AC472 }, + { .original = -65536.65536, .i = 0xC0F0000A7C5AC472 }, + { .original = 65535.65535, .i = 0x40EFFFF4F8A0902E }, + { .original = -65535.65535, .i = 0xC0EFFFF4F8A0902E }, + { .original = 4.503599627e15, .i = 0x432FFFFFFFF4B180 }, + { .original = -4.503599627e15, .i = 0xC32FFFFFFFF4B180 }, + { .original = 1.25e25, .i = 0x4524ADF4B7320335 }, + { .original = 1.25e307, .i = 0x7FB1CCF385EBC8A0 }, + { .original = 1.25e-25, .i = 0x3AC357C299A88EA7 }, + { .original = 1.25e-100, .i = 0x2B317F7D4ED8C33E }, + { .original = NAN, .i = 0x7FF8000000000000 }, + { .original = -INFINITY, .i = 0xFFF0000000000000 }, + { .original = INFINITY, .i = 0x7FF0000000000000 }, + { .original = 1.25e-132, .i = 0x248C6463225AB7EC }, + { .original = 0.0, .i = 0x0000000000000000 }, + { .original = -0.0, .i = 0x8000000000000000 }, + { .original = DBL_MIN, .i = 0x0010000000000000 }, + { .original = DBL_MAX, .i = 0x7FEFFFFFFFFFFFFF }, + { .original = -DBL_MIN, .i = 0x8010000000000000 }, + { .original = -DBL_MAX, .i = 0xFFEFFFFFFFFFFFFF }, + }; + + size_t errors = 0; + size_t elements = sizeof(tests) / sizeof(tests[0]); + for(size_t i = 0; i < elements ; i++) { + uint64_t *ptr = (uint64_t *)&tests[i].original; + + if(*ptr != tests[i].i && (tests[i].original == tests[i].d || (isnan(tests[i].original) && isnan(tests[i].d)))) { + if(!logged) + info("IEEE754: test #%zu, value " NETDATA_DOUBLE_FORMAT_G " is represented in this system as %lX, but it was expected as %lX", + i+1, tests[i].original, *ptr, tests[i].i); + errors++; + } + } + + if(!errors && sizeof(NETDATA_DOUBLE) == sizeof(uint64_t)) { + if(!logged) + info("IEEE754: system is using IEEE754 DOUBLE PRECISION values"); + + logged = true; + return true; + } + else { + if(!logged) + info("IEEE754: system is NOT compatible with IEEE754 DOUBLE PRECISION values"); + + logged = true; + return false; + } +} + storage_number pack_storage_number(NETDATA_DOUBLE value, SN_FLAGS flags) { // bit 32 = sign 0:positive, 1:negative // bit 31 = 0:divide, 1:multiply @@ -159,73 +231,3 @@ int print_netdata_double(char *str, NETDATA_DOUBLE value) return (int) ((wstr - str) + 2 + decimal ); } */ - -int print_netdata_double(char *str, NETDATA_DOUBLE value) { - // info("printing number " NETDATA_DOUBLE_FORMAT, value); - char integral_str[50], fractional_str[50]; - - char *wstr = str; - - if(unlikely(value < 0)) { - *wstr++ = '-'; - value = -value; - } - - NETDATA_DOUBLE integral, fractional; - -#ifdef STORAGE_WITH_MATH - fractional = modfndd(value, &integral) * 10000000.0; -#else - integral = (NETDATA_DOUBLE)((unsigned long long)(value * 10000000ULL) / 10000000ULL); - fractional = (NETDATA_DOUBLE)((unsigned long long)(value * 10000000ULL) % 10000000ULL); -#endif - - unsigned long long integral_int = (unsigned long long)integral; - unsigned long long fractional_int = (unsigned long long)llrintndd(fractional); - if(unlikely(fractional_int >= 10000000)) { - integral_int += 1; - fractional_int -= 10000000; - } - - // info("integral " NETDATA_DOUBLE_FORMAT " (%llu), fractional " NETDATA_DOUBLE_FORMAT " (%llu)", integral, integral_int, fractional, fractional_int); - - char *istre; - if(unlikely(integral_int == 0)) { - integral_str[0] = '0'; - istre = &integral_str[1]; - } - else - // convert the integral part to string (reversed) - istre = print_number_llu_r_smart(integral_str, integral_int); - - // copy reversed the integral string - istre--; - while( istre >= integral_str ) *wstr++ = *istre--; - - if(likely(fractional_int != 0)) { - // add a dot - *wstr++ = '.'; - - // convert the fractional part to string (reversed) - char *fstre = print_number_llu_r_smart(fractional_str, fractional_int); - - // prepend zeros to reach 7 digits length - int decimal = 7; - int len = (int)(fstre - fractional_str); - while(len < decimal) { - *wstr++ = '0'; - len++; - } - - char *begin = fractional_str; - while(begin < fstre && *begin == '0') begin++; - - // copy reversed the fractional string - fstre--; - while( fstre >= begin ) *wstr++ = *fstre--; - } - - *wstr = '\0'; - // info("printed number '%s'", str); - return (int)(wstr - str); -} |