This is the mail archive of the
gcc-bugs@gcc.gnu.org
mailing list for the GCC project.
[Bug target/32450] -pg seemingly causes miscompilation
- From: "ubizjak at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 4 Jul 2007 20:10:22 -0000
- Subject: [Bug target/32450] -pg seemingly causes miscompilation
- References: <bug-32450-6642@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #20 from ubizjak at gmail dot com 2007-07-04 20:10 -------
(In reply to comment #17)
> (the variable should be 0), but it looks like the assembly might be wrong:
> b.s:
> (1) cmpl $9, __cp_log_handling_MOD_stack_pointer(%rip)
> call mcount
> movq %rdi, %rbx
> (2) jle .L21
This _is_ wrong assembly. The call to mcount is clobbering flags reg between CC
setting insn (1) and CC receiving insn (2). From there, the problem becomes
trivial to track down, but I _really_ need a good sleep now.
--
ubizjak at gmail dot com changed:
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|unassigned at gcc dot gnu |ubizjak at gmail dot com
|dot org |
Status|UNCONFIRMED |ASSIGNED
Ever Confirmed|0 |1
Last reconfirmed|0000-00-00 00:00:00 |2007-07-04 20:10:22
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32450