the10thwiz/cc65
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Added further optimizations and unit tests.

Browse Source
This commit is contained in:
IrgendwerA8
2017-03-05 02:09:12 +01:00
parent 09de875330
commit 81115aa826
19 changed files with 327 additions and 177 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
libsrc/common/memmove.s
View File

@@ -1,6 +1,6 @@
;
; 2003-08-20, Ullrich von Bassewitz
; 2009-09-13, Christian Krueger -- performance increase (about 20%)
; 2009-09-13, Christian Krueger -- performance increase (about 20%), 2013-07-25 improved unrolling
; 2015-10-23, Greg King
;
; void* __fastcall__ memmove (void* dest, const void* src, size_t size);
@@ -61,13 +61,10 @@ PageSizeCopy: ; assert Y = 0
dec ptr1+1 ; adjust base...
dec ptr2+1
dey ; in entry case: 0 -> FF
lda (ptr1),y ; need to copy this 'intro byte'
sta (ptr2),y ; to 'land' later on Y=0! (as a result of the '.repeat'-block!)
dey ; FF ->FE
@copyBytes:
.repeat 2 ; Unroll this a bit to make it faster...
lda (ptr1),y
sta (ptr2),y
.repeat 3 ; unroll this a bit to make it faster...
lda (ptr1),y ; important: unrolling three times gives a nice
sta (ptr2),y ; 255/3 = 85 loop which ends at 0
dey
.endrepeat
@copyEntry: ; in entry case: 0 -> FF