Le 10/09/2020 à 10:04, David Laight a écrit :
From: Linus Torvalds
Sent: 09 September 2020 22:34
On Wed, Sep 9, 2020 at 11:42 AM Segher Boessenkool
<seg...@kernel.crashing.org> wrote:
It will not work like this in GCC, no. The LLVM people know about that.
I do not know why they insist on pushing this, being incompatible and
everything.
Umm. Since they'd be the ones supporting this, *gcc* would be the
incompatible one, not clang.
I had an 'interesting' idea.
Can you use a local asm register variable as an input and output to
an 'asm volatile goto' statement?
Well you can - but is it guaranteed to work :-)
With gcc at least it should work according to
https://gcc.gnu.org/onlinedocs/gcc/Local-Register-Variables.html
They even explicitely tell: "The only supported use for this feature is
to specify registers for input and output operands when calling Extended
asm "
Christophe
