[Bug optimization/12612] [3.4 Regression] ICE when using log function with -O3 -ffast-math

[reichelt at gcc dot gnu dot org]

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12612



------- Additional Comments From reichelt at gcc dot gnu dot org  2003-10-17 17:54 -------
Something with the optimization -fweb seems to be wrong.
Because of Jan's patch it's turned on with -O3.
That's probably why the bug appears with the patch.

Btw, just specifying the option "-fweb" on the command
line causes an ICE:

cc1: internal compiler error: in common_handle_option, at opts.c:656
Please submit a full bug report, [etc.]

In addition the documentation is quite incomplete: "-fweb" is only
mentioned once in the manual:

Optimize yet more.  @option{-O3} turns on all optimizations specified by
@option{-O2} and also turns on the @option{-finline-functions},
@option{-fweb} and @option{-frename-registers} options.

But nowhere is an explanation what "-fweb actually" does and it doesn't
appear in the list of optimization options.