On Wed, Mar 15, 2006 at 09:57:13PM -0800, Ian Lance Taylor wrote:
> Kevin Shanahan <kmshanah@xxxxxxxxxxxxxx> writes:
> > Are there any other options besides these which -O1 affects?
>
> -O1 is unfortunately not the sum of individual options. The compiler
> often simply checks whether you are optimizing at all, rather than
> checking specific options.
Okay, thanks anyway. I found out that the signed char cast in this
snippet of code changed behaviour with -O1:
int snd_scaletable[32][256];
int i, j;
for (i = 0; i < 32; i++)
for (j = 0; j < 256; j++)
snd_scaletable[i][j] = ((signed char)j) * i * 8;
I made the value explicit as '(j < 128) ? j : j - 256' instead.
Cheers,
Kevin.
