请教xtensa下的编译问题！！

chinavte

自己写makefile，碰到了以下问题，哪位大侠指教一下？？

经常出现找不到“asm”，如果用__asm__,则会出现一下情况：
C:/DOCUME~1/yjp/LOCALS~1/Temp/cc0s#648d.a01160: Assembler messages:
C:/DOCUME~1/yjp/LOCALS~1/Temp/cc0s#648d.a01160:459: Error: invalid last instruction for a zero-overhead loop
C:/DOCUME~1/yjp/LOCALS~1/Temp/cc0s#648d.a01160:501: Error: invalid last instruction for a zero-overhead loop
C:/DOCUME~1/yjp/LOCALS~1/Temp/cc0s#648d.a01160:965: Error: invalid last instruction for a zero-overhead loop
C:/DOCUME~1/yjp/LOCALS~1/Temp/cc0s#648d.a01160:1046: Error: invalid last instruction for a zero-overhead loop
C:/DOCUME~1/yjp/LOCALS~1/Temp/cc0s#648d.a01160:1167: Error: invalid last instruction for a zero-overhead loop
C:/DOCUME~1/yjp/LOCALS~1/Temp/cc0s#648d.a01160:1280: Error: invalid last instruction for a zero-overhead loop
C:/DOCUME~1/yjp/LOCALS~1/Temp/cc0s#648d.a01160:1394: Error: invalid last instruction for a zero-overhead loop
C:/DOCUME~1/yjp/LOCALS~1/Temp/cc0s#648d.a01160:1744: Error: invalid last instruction for a zero-overhead loop
C:/DOCUME~1/yjp/LOCALS~1/Temp/cc0s#648d.a01160:1858: Error: invalid last instruction for a zero-overhead loop
xt-xcc ERROR:  C:/usr/xtensa/XtDevToolsDE/install/tools/RB-2006.0-win32/XtensaTools/bin/xt-as.exe returned non-
zero status 1

cpu是xtensa的，如果注释的关于asm和inline相关的，则编译能通过！！

请教，谢谢！！！

chinavte

搞了两天终于找到了点问题，把-o2改成-o1或-o0就没问题了，不过不知道具体原因，不知哪位大侠给解释一下？？？