Seems nobody cares about --std-c99 and _Bool speed before, so I made a test
my self, using the following function:
BOOLEAN TestBoolean(BOOLEAN b1)
{
USHORT s;
BOOLEAN b2;
BOOLEAN b3;
b3 = IsHighSpeed();
for (s = 0; s < 30000; s ++)
{
b2 = b1 ? b3 : FALSE;
}
return b2;
}
When BOOLEAN as unsigned char, the running time of this function on my Z80
is 137ms, and code generated is less by 4 bytes.
When BOOLEAN as _Bool, using bit related instructions, this function need
167ms to run.
Woody
http://palmmicro.com/woody/
----- Original Message -----
From: "Lin Rongrong" <[email protected]>
To: <[email protected]>; <[email protected]>
Sent: Monday, December 06, 2010 8:30 AM
Subject: Z80 --std-c99 and _Bool
>I have noticed that Philipp used _Bool in his own project, so I tried it
>with my own. To my surprise, after I added --std-c99 option, change BOOLEAN
>from "unsigned char" to "_Bool", I found code size generally get larger as
>below:
>
> code0 data code1 code2 code3 code4 code5 code6 code7 code
> 1D5B 19C4 456D 4F9C 4742 50AD 53F1 4354 5571 1B64 // gp2266 sip
> 0.49.022, without --std-c99, or BOOLEAN as "unsigned char" with --std-c99,
> they generated the same result
> 1D76 19C4 4610 4FD4 47A7 50B9 542D 4354 55A6 1B67 // gp2266 sip
> 0.49.023, with --std-c99 and BOOLEAN as "_Bool"
>
> I am willing to get faster speed with more code size, should I
> keep --std-c99 option and use BOOLEAN as _Bool?
>
> Woody
>
> http://palmmicro.com/woody/
>
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