| From | Andi Kleen <> | Subject | Re: [PATCH 2/8] i386: bitops: Rectify bogus "Ir" constraints | Date | Mon, 23 Jul 2007 18:10:08 +0200 |
| |
On Monday 23 July 2007 18:05:38 Satyam Sharma wrote: > From: Satyam Sharma <ssatyam@cse.iitk.ac.in> > > [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
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
|