只有几种固有的选项! #pragma optimize=param[ param...] Parameters balanced|size|speed Optimizes balanced between speed and size, optimizes for size, or optimizes for speed none|low|medium|high Specifies the level of optimization no_code_motion Turns off code motion no_cse Turns off common subexpression elimination no_inline Turns off function inlining no_tbaa Turns off type-based alias analysis no_unroll Turns off loop unrolling no_scheduling Turns off instruction scheduling