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https://stackoverflow.com/questions/13903785/implementation-of-type-long-double-with-gcc-and-c11
I've tried searching for information on long double, and so far I understand it is implemented differently by compilers. When using GCC on Ubuntu (XUbuntu) Linux 12.10 I get this: double PId = ac...
https://gcc.gnu.org/onlinedocs/gcc/Long-Long.html
6.10 Double-Word Integers ISO C99 and ISO C++11 support data types for integers that are at least 64 bits wide, and as an extension GCC supports them in C90 and C++98 modes. Simply write long long int for a signed integer, or unsigned long long int for an unsigned integer.
https://discussions.apple.com/thread/1699214
Sep 08, 2008 · -m96bit-long-double -m128bit-long-double These switches control the size of long double type. The i386 application binary interface specifies the size to be 96 bits, so -m96bit-long-double is the default in 32 bit mode. Modern architectures (Pentium and newer) would prefer long double to be aligned to an 8 or 16 byte boundary.
https://octave.1599824.n4.nabble.com/long-double-support-td1630984.html
Hello All, if I understand correctly, 'octave' does not support 'long double' data. Is this the case ? I think I've stumbled upon a case of insufficient precision, and if simple means don't help, I'll have to resort to "brute force", i.e. to increase precision. Can I force 'gcc' to consider all doubles as long doubles ?
https://cboard.cprogramming.com/c-programming/170867-128-bit-long-double-printf-not-working.html
Jun 30, 2016 · 128 bit (long double) printf not working ... GCC's long double is 80-bit extended precision format, not 128-bit like you're looking for. ... MinGW uses the I/O resp. formatting functions from the Microsoft C runtime, which doesn't support 80 bit floating point numbers (long double == double …
https://www.zhihu.com/question/30163608
至少在我机器上 TDM-GCC 4.9.2 的处理方式是： long double 表示 80bit 扩展精度浮点数。 但为了字节对齐，占用空间为 12B （32位程序）或 16B （64位程序），未使用的位全部填 0 。Reviews: 4
https://en.wikipedia.org/wiki/Long_double
With gcc on Linux, 80-bit extended precision is the default; on several BSD operating systems (FreeBSD and OpenBSD), double-precision mode is the default, and long double operations are effectively reduced to double precision. (NetBSD 7.0 and later, however, defaults to 80-bit extended precision ).
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