[MPlayer-dev-eng] [PATCH] fast_cmov should be set on x86_64
Reimar Döffinger
Reimar.Doeffinger at stud.uni-karlsruhe.de
Tue Dec 23 10:20:35 CET 2008
Hello,
going by what I read by Intel, cmov should be used on everything but the
P4s - since the 64 bit case currently does not explicitly detect them,
only very few with 64 bit support exist, and their performance is horrible
for multimedia anyway I suggest changing the default:
Index: configure
===================================================================
--- configure (revision 28181)
+++ configure (working copy)
@@ -1935,6 +1938,7 @@
else
cpuopt=-mcpu
fi
+ test $_fast_cmov = "auto" && _fast_cmov=yes
if test "$_runtime_cpudetection" = no ; then
case "$pvendor" in
AuthenticAMD)
@@ -1946,7 +1950,6 @@
# 64-bit prescotts exist, but as far as GCC is concerned they
# have the same capabilities as a nocona.
proc=nocona
- test $_fast_cmov = "auto" && _fast_cmov=no
;;
esac
;;
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