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SubjectRe: gcc 4.5.1 / as 2.20.51.0.11 miscompiling drivers/char/i8k.c ?
On 08/11/2010 11:20, Andi Kleen wrote:

> An asm with live inputs and outputs should never be optimized
> way. If 4.5.1 started doing that it's seriously broken.

I don't see that. Consider:

void foo (void)
{
int x, y, z;
x = 23;
y = x + 1;
z = y + 1;
}

So far, you'd agree the compiler may optimise the entire function away? So
why not this:

void foo (void)
{
int x, y, z;
x = 23;
asm ("do something" : "=r" (y) : "r" (x) );
z = y + 1;
}

?

cheers,
DaveK


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