Interesting: http://blog.regehr.org/archives/1384 -- Andrei
On 4/12/2016 5:06 AM, Andrei Alexandrescu wrote:
Interesting: http://blog.regehr.org/archives/1384 -- Andrei
Curiously never mentioned is the following optimization:
return a+b*2+27;
becomes:
LEA EAX,27[ESI][EDI*2]
To overflow check:
ADD EDI,EDI
JO overflow
ADD EDI,27
On Wednesday, 13 April 2016 at 22:13:27 UTC, Walter Bright wrote:
On 4/12/2016 5:06 AM, Andrei Alexandrescu wrote:
Interesting: http://blog.regehr.org/archives/1384 -- Andrei
Curiously never mentioned is the following optimization:
return a+b*2+27;
becomes:
LEA EAX,27[ESI][EDI*2]
T
On Thursday, 14 April 2016 at 02:55:01 UTC, deadalnix wrote:
On Wednesday, 13 April 2016 at 22:13:27 UTC, Walter Bright
wrote:
On 4/12/2016 5:06 AM, Andrei Alexandrescu wrote:
Interesting: http://blog.regehr.org/archives/1384 -- Andrei
Curiously never mentioned is the following optimization:
On 4/13/2016 8:00 PM, deadalnix wrote:
Also, just checked, on sandy bridge, the LEA has 3clock latency (but start
earlier in the pipeline) and the add 1, so it is not as bad as it looks (it is
still bad).
The size is larger, too (not so cache friendly). Integer arithmetic is sort of
the bread
On Thursday, 14 April 2016 at 04:52:12 UTC, Walter Bright wrote:
On 4/13/2016 8:00 PM, deadalnix wrote:
Also, just checked, on sandy bridge, the LEA has 3clock
latency (but start
earlier in the pipeline) and the add 1, so it is not as bad as
it looks (it is
still bad).
The size is larger, to
