Re: [patch 1/2] Enable link power management for ata drivers

[Davide Libenzi <davidel@xmailserver.org>]

On Tue, 25 Sep 2007, roel wrote:

> > +	if (!(ap->flags & ATA_FLAG_IPM) || !ata_dev_enabled(dev)) {
> 
> 	if (!((ap->flags & ATA_FLAG_IPM) && ata_dev_enabled(dev))) {

int foo(int i, int j) {
        
        return !(i & 8) || !j;
}

int moo(int i, int j) {
        
        return !((i & 8) && j);
}


gcc -O2 -S:


.globl foo
        .type   foo, @function
foo:
        shrl    $3, %edi
        xorl    $1, %edi
        testl   %esi, %esi
        sete    %al
        orl     %eax, %edi
        andl    $1, %edi
        movl    %edi, %eax
        ret
.globl moo
        .type   moo, @function
moo:
        shrl    $3, %edi
        xorl    $1, %edi
        testl   %esi, %esi
        sete    %al
        orl     %eax, %edi
        andl    $1, %edi
        movl    %edi, %eax
        ret



- Davide


-
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