Re: atomic.h cleanup

[Markus Wichmann <nullplan@gmx.net>]

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Hi all,

And once more with the promised attachments. I'm sorry.

Ciao,
Markus

[-- Attachment #2: cas.c --]
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static inline int a_ll(volatile int *p) {
    int x;
    asm volatile ("lwarx %0, 0, %1" : "=r"(x) : "r"(p) : "memory");
    return x;
}

static inline int a_sc(volatile int *p, int x) {
    asm goto ("stwcx. %0, 0, %1\nbne- %l2" : : "r"(x), "r"(p) : "cc","memory" : fail);
    return 1;
fail:
    return 0;
}

int a_cas(volatile int *p, int t, int s) {
    int x;
    do {
        x = a_ll(p);
        if (x != t)
            break;
    } while (!a_sc(p, s));
    return x;
}

[-- Attachment #3: cas.s --]
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	.file	"cas.c"
	.section	".text"
	.align 2
	.globl a_cas
	.type	a_cas, @function
a_cas:
.L2:
#APP
 # 3 "cas.c" 1
	lwarx 9, 0, 3
 # 0 "" 2
#NO_APP
	cmpw 7,4,9
	bne- 7,.L4
#APP
 # 8 "cas.c" 1
	stwcx. 5, 0, 3
bne- .L2
 # 0 "" 2
#NO_APP
.L3:
	mr 3,4
	blr
.L4:
	mr 4,9
	b .L3
	.size	a_cas, .-a_cas
	.ident	"GCC: (GNU) 4.9.2"
	.section	.note.GNU-stack,"",@progbits