use different optimizations for x86 & x86_64 on uml

SVN-Revision: 13984

toolchain/Config.in

@@ -106,7 +106,9 @@ config TARGET_OPTIMIZATION
 	prompt "Target Optimizations" if TOOLCHAINOPTS
 	default "-O2 -pipe -march=i686 -funit-at-a-time" if TARGET_x86_mediacenter
 	default "-O2 -pipe -march=i486 -funit-at-a-time" if TARGET_x86
-	default "-Os -pipe -march=i486 -funit-at-a-time" if TARGET_rdc || TARGET_uml
+	default "-Os -pipe -march=i486 -funit-at-a-time" if TARGET_rdc
+	default "-Os -pipe -march=i486 -funit-at-a-time" if TARGET_uml && i386
+	default "-Os -pipe -march=athlon64 -funit-at-a-time" if TARGET_uml && x86_64
 	default "-Os -pipe -mips32r2 -mtune=mips32r2 -funit-at-a-time" if TARGET_ar71xx
 	default "-Os -pipe -mips32 -mtune=mips32 -funit-at-a-time" if mipsel || mips
 	default "-Os -pipe -march=armv5te -mtune=xscale -funit-at-a-time" if TARGET_ixp4xx || TARGET_iop32x || TARGET_pxa || TARGET_orion