• Robert Griesemer's avatar
    cmd/internal/gc: use 512 bits (rather than 464) for multi-precision arithmetic · a51d5f27
    Robert Griesemer authored
    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/8429Reviewed-by: 's avatarRuss Cox <rsc@golang.org>
    a51d5f27
mparith2.go 5.02 KB