W dniu 2010-10-22 23:30, Florian Klämpfl pisze:
Am 22.10.2010 23:17, schrieb Dariusz Mazur:
full source in attachment (should I prepare it different?)
The best would be a diff against compiler sources.
OK. First I find better computing of hash. My is slight worse than
current (but overall faster)
Second: when I review assembler list I've notice some strange lines (all
optimizations are enabled):
Which compiler version? 2.4.x? I think r15502 in trunk should fix this.
2.5.1 but older. Now I test from current. Its better (faster) but I
found other strange:
first: dec(i) is translate to three lines
movl %esi,%eax
decl %eax
movl %eax,%esi
why not simple decl %esi ?
When variable is in %ebx things are the same.
second if I have:
while ii>0 do begin
....;
dec(ii);
assembler look:
# [121] while ii>0 do begin
jmp .Lj16 //< here add first test of ii
.balign 4,0x90
.Lj15:
.Ll8:
# [122] result:=LongWord(result *8010817 ) xor (Pw^);
.Ll10:
# [124] dec(ii);
movl %esi,%eax
decl %eax
movl %eax,%esi
.Lj16:
testl %esi,%esi //<-- this can be avoid, because test from DECL
jg .Lj15
Is this possible to achieve this optimizations,
If yes, can somebody help, from which file I should start
--
Darek
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