[linux-audio-user] CFLAGS for compiling audio programs - a little advice

I'm running gentoo, and upon reading the gcc flag descriptions i've determined that my cpu can support the following CFLAGS CFLAGS="-O2 -march=pentium4 -pipe -msse -msse2 -mmmx -mfpmath=sse" cat /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 15 model : 2 model name : Intel(R) Pentium(R) 4 CPU 2.66GHz stepping : 9 cpu MHz : 2658.181 cache size : 512 KB fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 2 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe cid xtpr bogomips : 5323.63 and so that's what i've been compiling with. trouble is, rosegarden doesn't run at all before segfaulting, MusE does pretty well but sort of segfaults at random. so does anyone think that this instability could be related to overly agressive cflags? i think that the fmpath=sse might be a bad idea, as it sortof forces the compiler to use the floating point co-processor (?). in a more genral sense, will all my bells and whistles be used if i don't set these compile flags, and will they really make that much of a difference? how about xrun wise? Does anyone out there have good performace for audo apps with a simalar chip and what flags are you using? Thanks ahead of time, and if all this is already discussed somewhere, a link would be just dandy. Brian