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11706 vs ([lno] Canonical iv creation)
- From: Paolo Carlini <pcarlini at suse dot de>
- To: Zdenek Dvorak <rakdver at atrey dot karlin dot mff dot cuni dot cz>
- Cc: gcc-patches at gcc dot gnu dot org, libstdc++ <libstdc++ at gcc dot gnu dot org>,Richard Guenther <rguenth at tat dot physik dot uni-tuebingen dot de>
- Date: Fri, 12 Mar 2004 17:42:12 +0100
- Subject: 11706 vs ([lno] Canonical iv creation)
- References: <20040312013916.GA9757@atrey.karlin.mff.cuni.cz>
Hi again,
finally, I have been able to actually test the the new pass on the code
we care about. The current assembler, is simply *astonishing*.
E.g.:
double f(double a)
{
return std::pow(a, 4);
}
On x86, -O2 -fomit-frame-pointer -ftree-loop-optimize -fscalar-evolutions
-funroll-loops:
00000000 <f(double)>:
0: dd 44 24 04 fldl 0x4(%esp)
4: d8 c8 fmul %st(0),%st
6: d8 c8 fmul %st(0),%st
8: c3 ret
Paolo.