[LLVMdev] clang modifying clobbered register in case of inline assembly resulting in data corruption

[Eli Friedman]

On Wed, Nov 28, 2012 at 11:49 PM, Karthik Bhat <karthikthecool at gmail.com> wrote:
> In this case the value of data[0] has got corrupted as clang is not
> honoring clobbered register and stores a different value in $eax.

Not a bug; that isn't how clobbers work.  We don't make any guarantees
about the values of registers between inline asm statements.  If you
need an operand in a particular register, see
http://gcc.gnu.org/onlinedocs/gcc/Local-Reg-Vars.html etc.

-Eli