[Bug target/56028] Splitting a 64-bit volatile store

[ubizjak at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56028

--- Comment #1 from Uros Bizjak <ubizjak at gmail dot com> 2013-01-18 11:09:42 UTC ---
- Does language standard guarantee atomic store in this case [wikipedia says
"No." [1]]?

- Can a store to a volatile DImode location be implemented as two consecutive
SImode stores to adjacent location (this breaks stores of 64bit immediates to
MMIO 64bit registers)?

[1] http://en.wikipedia.org/wiki/Volatile_variable#In_C_and_C.2B.2B