[Bug target/53110] GCC-4.7 generates stupid x86_64 asm

[peterz at infradead dot org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53110

--- Comment #6 from peterz at infradead dot org 2012-04-25 13:00:47 UTC ---
OK rectification, that's what it _should_ compute, I just noticed
add_u128() is missing: a.hi += b.hi; Anyway, that's all besides the point, the
issue is that gcc shouldn't generate those andl 0xFFFFFFFF, %r thingies,
regardless if the C makes sense or not.