basic-block profiling

[Saisanthosh Balakrishnan <sai at cs dot wisc dot edu>]

Hi, 

I've been using gcc's (3.0.3, Linux, x86) -a (basic-block profiling)
to get the execution frequency counts of basic blocks. "-ax", a
documented flag, that is supposed to provide jump address and bb
traces never worked for me. I get the following error with gcc -ax
simple.c:

simple.c is the first example program in gcov's info page.
simple.c: In function `main':
simple.c:14: Unrecognizable insn:
(call_insn 92 91 93 (call (mem:QI (symbol_ref ("__bb_trace_ret")) 0)
        (const_int 0 [0x0])) -1 (nil)
		    (nil)
			    (nil))
simple.c:14: Internal compiler error in insn_default_length, at
insn-attrtab.c:223
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://www.gnu.org/software/gcc/bugs.html> for instructions.

I assumed that the support for basic-block profiling was in initial
stages in gcc-3.0.3, and downloaded gcc-3.2. I was surprised, when gcc
reported -a and -ax as unsupported flags. I did not see any references
to these flags in toplev.c (libgcc2.c etc.). However, the flags are
documented in gcc-3.2 info page! Could the authors of profiling
(and/or basic-block profiling), respond as to what's going on, what I
could expect to see in future releases of gcc?

Thanks in advance.
Sai