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[Bug target/39949] [4.5 regression] Revision 146874 breaks %z on x87 insns
- From: "jakub at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 28 Apr 2009 23:51:36 -0000
- Subject: [Bug target/39949] [4.5 regression] Revision 146874 breaks %z on x87 insns
- References: <bug-39949-682@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #10 from jakub at gcc dot gnu dot org 2009-04-28 23:51 -------
I disagree, while the modifiers are perhaps undocumented, there is tons of
software in the wild that uses them heavily (I don't know about %z, but many
other modifiers) and breaking that all would be a terrible idea.
Look at longlong.h for examples, glibc, Linux kernel just to name a few. Just
do
find . -name \*.[ch] | xargs grep '[^%]%[a-zA-Z][0-9]'
and you'll see lots of those (of course with some false positives, but those
are
easily recognizable), on many different targets.
The right thing is just to document them.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39949