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[Bug c/53353] Missing error/warning when using __int128_t with incorrect asm register constraints
- From: "svfuerst at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Tue, 15 May 2012 02:09:05 +0000
- Subject: [Bug c/53353] Missing error/warning when using __int128_t with incorrect asm register constraints
- Auto-submitted: auto-generated
- References: <bug-53353-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53353
--- Comment #4 from Steven Fuerst <svfuerst at gmail dot com> 2012-05-15 02:09:05 UTC ---
Actually, it is the rax:rdx pair that is most likely. ax:dx only has 32 bits.
rax:rdx is specified by the 'A' constraint, the only gpr option that is 128
bits.
(Yes, it would be nice to pass a 128 bit integer in some other pair of
registers as an enhancement, but currently only the 'A' constraint works.)