[Bug inline-asm/92597] std::fma gives nan using -march=sandybridge+ with asm volatile

[leppkes at stce dot rwth-aachen.de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92597

--- Comment #6 from Klaus Leppkes <leppkes at stce dot rwth-aachen.de> ---
As it might be purely related to google benchmark, I opened an issues for
google benchmark citing this bug report:
https://github.com/google/benchmark/issues/903

I search for some doc and found
"g" : Any register, memory or immediate integer operand is allowed, except for
registers that are not general registers." (x86 specified!).
vs.
 "m" : A memory operand is allowed, with any kind of address that the machine
supports in general.
source: https://www.ibiblio.org/gferg/ldp/GCC-Inline-Assembly-HOWTO.html

So I tend to thing the code should be modified on google benchmark in case of
using  x86 machines.