[Bug target/32450] -pg seemingly causes miscompilation

[ubizjak at gmail dot com]

------- Comment #9 from ubizjak at gmail dot com  2007-07-04 14:11 -------
(In reply to comment #1)
> Most likely -pg is changing the alignment of the stack which is incorrect.  Oh
> -pg code is emitted by the target specific code so this is a target issue.

Hm, on x86_64 pg inserts:

fprintf (file, "\tleaq\t%sP%d@(%%rip),%%r11\n", LPREFIX, labelno);
fprintf (file, "\tcall\t*%s@GOTPCREL(%%rip)\n", MCOUNT_NAME);

So, it loads %r11 and calls mcount. The only thing that can go wrong is, that
some value in %r11 gets rewritten. Could you look what happens with %r11 around
the point of failure?


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32450