On Monday 23 July 2007 18:05:38 Satyam Sharma wrote:
> From: Satyam Sharma <[email protected]>
>
> [2/8] i386: bitops: Rectify bogus "Ir" constraints
>
> The "I" constraint (on the i386 platform) is used to restrict constants to
> the 0..31 range, for use with instructions that must deal with bit numbers.
It means I or r, not I modified by r. This means either a immediate constant
0..31 or a register, which is correct.
% cat t18.c
f()
{
asm("xxx %0" :: "rI" (10));
asm("yyy %0" :: "rI" (100));
}
% gcc -O2 -S t18.c
% cat t18.s
...
f:
.LFB2:
#APP
xxx $10
#NO_APP
movl $100, %eax
#APP
yyy %eax
#NO_APP
ret
.LFE2:
...
-Andi
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