Arnd Bergmann wrote:
On Thursday 09 November 2006 15:52, Avi Kivity wrote:
Wouldn't that make inline assembly useless? Suppose the contents is
itself a pointer. What about the pointed-to contents?
e.g.
int x = 3;
int *y = &x;
int z;
asm ("mov %1, %%rax; movl (%%rax), %0" : "=r"(z) : "g"(y) : "rax");
assert(z == 3);
Same here, you need to tell gcc what is really accessed, like
asm ("mov %1, %%rax; movl (%%rax), %0" : "=r"(z) : "g"(y), "m"(*y) : "rax");
I know that the s390 kernel developers have hit that problem
frequently with inline assemblies. It may be that it's harder
to hit on x86, because there are fewer registers available and
data therefore tends to spill to the stack.
I'll update my tree to reflect this. Thanks.
--
error compiling committee.c: too many arguments to function
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