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[Bug rtl-optimization/19680] sub-optimial register allocation with sse
- From: "tbptbp at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 31 Jan 2005 22:58:17 -0000
- Subject: [Bug rtl-optimization/19680] sub-optimial register allocation with sse
- References: <20050128233416.19680.tbptbp@gmail.com>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Additional Comments From tbptbp at gmail dot com 2005-01-31 22:58 -------
In previous test i've used a crufted string of compilation options; i've removed
all that crap for -O3 -march=k8 -mfpmath=sse -fno-gcse -fno-exceptions.
The second patch, hack sse simode inputs, is a small win or at least a draw,
inlined or not, -fno-gcse or not.
The first one, mark builtins constant, is a lose in every conditions; it's the
one that triggers those stack references/movements noted earlier (and my guess
is what's causing the perf regression, other than that the code seems prettier).
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19680