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[Bug target/40171] GCC does not pass -mtune and -march options to assembler!
- From: "vvv at ru dot ru" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 25 May 2009 19:54:25 -0000
- Subject: [Bug target/40171] GCC does not pass -mtune and -march options to assembler!
- References: <bug-40171-17483@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #4 from vvv at ru dot ru 2009-05-25 19:54 -------
(In reply to comment #2)
> This is very odd? What is the assembler doing that the compiler isn't?
There are exist some optimizations impossible without exact knowledge of
address and opcodes,
One example avoiding of branch mispredicts -
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39942
Other example - Ensure instructions using 0xF7 opcode byte does not start at
offset 14 of a fetch line...
Unfortunately, current version GNU AS cat't do this optimizations.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40171