Use -O9, tune for nocoma, assume at least a Pentium when generating code.

SConstruct

Index: SConstruct
===================================================================
--- SConstruct	(revision 384)
+++ SConstruct	(working copy)
@@ -53,7 +53,7 @@
       'CPPDEFINES':   ['ENABLE_DISASSEMBLER', 'DEBUG']
     },
     'mode:release': {
-      'CCFLAGS':      ['-O2']
+      'CCFLAGS':      ['-O9', '-mtune=nocona', '-march=pentium']
     },
     'wordsize:64': {
       'CCFLAGS':      ['-m32'],
@@ -137,7 +137,7 @@
 DTOA_EXTRA_FLAGS = {
   'gcc': {
     'all': {
-      'WARNINGFLAGS': ['-Werror']
+      'WARNINGFLAGS': ['-Werror', '-fno-strict-aliasing']
     }
   },
   'msvc': {
@@ -188,7 +188,7 @@
       'LINKFLAGS':    ['-m32']
     },
     'mode:release': {
-      'CCFLAGS':      ['-O2']
+      'CCFLAGS':      ['-O2', '-mtune=nocona', '-march=pentium']
     },
     'mode:debug': {
       'CCFLAGS':      ['-g', '-O0']