Retro/pcjs
Watch
1
0
Fork
You've already forked pcjs
 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Made a tiny 72-bit division optimization

Browse source
This commit is contained in:
Jeff 2017-04-02 11:43:54 -07:00 • committed by Jeff Parsons
commit 3fb3f44384
3 changed files with 33 additions and 34 deletions
Download patch file Download diff file Expand all files Collapse all files

3
modules/pdp10/lib/cpuops.js
View file

@ -6253,8 +6253,7 @@ PDP10.doDIV = function(src, dst, ext)
ext = (dst > PDP10.INT_MASK)? PDP10.WORD_MASK : 0;
} else {
var srcAbs = (src < PDP10.INT_LIMIT? src : PDP10.TWO_POW36 - src);
var dstAbs = (dst < PDP10.INT_LIMIT? dst : PDP10.TWO_POW36 - dst);
var extAbs = (ext < PDP10.INT_LIMIT? ext : PDP10.TWO_POW36 - ext - (dstAbs? 1 : 0));
var extAbs = (ext < PDP10.INT_LIMIT? ext : PDP10.TWO_POW36 - ext - (dst? 1 : 0));
if (extAbs >= srcAbs) {
this.regPS |= PDP10.PSFLAG.DCK | PDP10.PSFLAG.AROV;
return -1;