https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64119
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |INVALID
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
You are not using local register assembly variables as documented.
From
https://gcc.gnu.org/onlinedocs/gcc-4.9.2/gcc/Explicit-Reg-Vars.html#Explicit-Reg-Vars:
Local register variables in specific registers do not reserve the registers,
except at the point where they are used as input or output operands in an asm
statement and the asm statement itself is not deleted. The compiler's data flow
analysis is capable of determining where the specified registers contain live
values, and where they are available for other uses. Stores into local register
variables may be deleted when they appear to be dead according to dataflow
analysis. References to local register variables may be deleted or moved or
simplified.
