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Starting with Ruby version 1.9.2 (released on 18 August 2010), the bug with year 2038 is fixed, [16] by storing time in a signed 64-bit integer on systems with 32-bit time_t. [ 17 ] Starting with NetBSD version 6.0 (released in October 2012), the NetBSD operating system uses a 64-bit time_t for both 32-bit and 64-bit architectures.
Similarly, in the Windows operating systems, the FILETIME structure stores the number of 100-nanosecond ticks since 1 January 1601 as a signed 64-bit integer. This value will overflow on 14 September 30,828 at 02:48:05 UTC, after which Windows will not accept dates beyond this day and will display "invalid system time" errors in NTFS.
It is therefore the maximum value for variables declared as integers (e.g., as int) in many programming languages. The data type time_t, used on operating systems such as Unix, is a signed integer counting the number of seconds since the start of the Unix epoch (midnight UTC of 1 January 1970), and is often implemented as a 32-bit integer. [8]
Sign bit: 1 bit; Exponent: 11 bits; Significand precision: 53 bits (52 explicitly stored) The sign bit determines the sign of the number (including when this number is zero, which is signed). The exponent field is an 11-bit unsigned integer from 0 to 2047, in biased form: an exponent value of 1023 represents the actual zero. Exponents range ...
Integer overflow can be demonstrated through an odometer overflowing, a mechanical version of the phenomenon. All digits are set to the maximum 9 and the next increment of the white digit causes a cascade of carry-over additions setting all digits to 0, but there is no higher digit (1,000,000s digit) to change to a 1, so the counter resets to zero.
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Subtract and pack 16-bit signed integers horizontally PHSUBSW mm1, mm2/m64: 0F 38 07 /r: Subtract and pack 16-bit signed integer horizontally with saturation PHSUBD mm1, mm2/m64: 0F 38 06 /r: Subtract and pack 32-bit signed integers horizontally PHADDSW mm1, mm2/m64: 0F 38 03 /r: Add and pack 16-bit signed integers horizontally, pack saturated ...
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