| commit | a51d5f27e8a6fd97b27fb864cd284589c850836e | [log] [tgz] |
|---|---|---|
| author | Robert Griesemer <gri@golang.org> | Thu Apr 02 16:34:48 2015 -0700 |
| committer | Robert Griesemer <gri@golang.org> | Fri Apr 03 17:13:07 2015 +0000 |
| tree | 956de681f6418e128c2b9729060350e31f65e59b | |
| parent | 14bbab47584844d2c32534564f0f3f51b76df05a [diff] |
cmd/internal/gc: use 512 bits (rather than 464) for multi-precision arithmetic The original implementation used 16 int "words" but only 29 bits per word for a total of 16*29 = 464 bits, with a space consumption of 16*64 = 1024 bits on a 64 bit machine. Switching to 512 bits increases precision while still using (in the worst case) half the amount of memory per mp value on a 64 bit machine. Also: Decreased permitted number of least-significant mantissa bits which may be incorrect when considering if a precise floating-point constant is an integer from 29 to 16 bits. Change-Id: Iee9287056f0e9aa4f06ceac0724ff4674f710c53 Reviewed-on: https://go-review.googlesource.com/8429 Reviewed-by: Russ Cox <rsc@golang.org>
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