Message 75560 - Python tracker (original) (raw)

I'll investigate the slowdowns

The problem may comes from int64_t on 32 bits CPU. 32x32 -> 64 may be emulated on your CPU and so it's slower. I improved your patch to make it faster, but I lost all my work because of a misuse of GIT... As I remember:

• I fixed PyLong_FromLong() for small negative integer
• I unrolled the loop in PyLong_FromLong(): the loop is at least called twice (the number has 2 digits or more)
• I added special code for operations on two numbers of 1 digit (each) for long_add(), long_mul(), long_div(), long_bitwise(), etc.
• and I don't remember the other changes...

Oh, I have an old patch. I will attach it to this message. About speed, it was:

• unpatched: 20600..20900 pystones
• your patch: 19900..20100 pystones
• • my changes: 20200..20400 pytones