(no subject)

[eub]

Well, I took some pictures of the cherry tree blooming out front, and had fun with Photoshop.
flowers crop median min crop
spray sky rot crop dodge sharpen

I really don't know what I'm going to do for a job. Trying to persuade people that they don't really need me to have five years of full-lifecycle industry experience doesn't seem to be working.

I spent my whole coding day tracking down a timing problem that turned out to stem from a boneheaded error in doing arithmetic. Here's a quiz for your job applicants: given two pairs of uint32 values, (start_hi, start_lo) and (stop_hi, stop_lo), compute the 64-bit difference (stop - start).



Possible answer #1: something like
diff_lo = stop_lo - start_lo; // wraparound still gives correct lo.
diff_hi = stop_hi - start_hi;
diff = (((uint64) diff_hi) << 32) | diff_lo;
Diagnosis: too dumb.

Possible answer #2: something like
diff_lo = stop_lo - start_lo; // wraparound still gives correct lo.
diff_hi = stop_hi - start_hi - !!(start_lo > stop_lo); // borrow?
diff = (((uint64) diff_hi) << 32) | diff_lo;
Diagnosis: too damn clever.

Possible answer #3: something like
start = (((uint64) start_hi) << 32) | start_lo;
stop = (((uint64) stop_hi) << 32) | stop_lo;
diff = stop - start;
Diagnosis: might be okay.



But we had very good sushi at Ototo. (For better or for worse, they were out of this intriguing-sounding green tea tiramisu.)

Comments

[kalmn.livejournal.com]

[blink]

oh, dear.

please tell me that you are being overly specific and that you haven't seen seaweed icecream, not that you haven't seen green tea ice cream. if you haven't seen green tea ice cream, let me know and i will figure out a way to ship you some.

[eub.livejournal.com]

Seaweed!