[MPlayer-dev-eng] [PATCH] configure: -mtune=generic for runtime CPU detection

[Zuxy Meng]

Hi,

gcc 4.2.0 (currently in rc1 stage) will support "generic"
optimization, which promises to deliver optimal performance on a
collection of "comtemporary" CPUs (now including AMD Athlon, AMD
Opteron, Intel Pentium M, Intel Pentium 4 and Intel Core 2). This
patch add this feature for mplayer, falling back to i686 for older
gcc.

-- 
Zuxy
Beauty is truth,
While truth is beauty.
PGP KeyID: E8555ED6
-------------- next part --------------
Index: configure
===================================================================
--- configure	???????? 22356??
+++ configure	????????????
@@ -1682,10 +1684,10 @@
       _optimizing="$proc"
     fi
   else # if test "$_runtime_cpudetection" = no
-    # i686 is probably the most common CPU - optimize for it
-    _mcpu="$cpuopt=i686"
+    _mcpu="$cpuopt=generic"
     # at least i486 required, for bswap instruction
     _march="-march=i486"
+    cc_check $_mcpu || _mcpu="$cpuopt=i686"
     cc_check $_mcpu || _mcpu=""
     cc_check $_march $_mcpu || _march=""
   fi
@@ -1794,7 +1797,8 @@
     else # if test "$_runtime_cpudetection" = no
       # x86-64 is an undocumented option, an intersection of k8 and nocona.
       _march="-march=x86-64"
-      _mcpu="$cpuopt=x86-64"
+      _mcpu="$cpuopt=generic"
+      cc_check $_mcpu || _mcpu="x86-64"
       cc_check $_mcpu || _mcpu=""
       cc_check $_march $_mcpu || _march=""
     fi