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TMS320F280049C: FPUmathTables问题

Part Number: TMS320F280049C

   如图,在第一张图中,我未注释sincos函数,fpumathtable出现在map文件中。我注释掉sincos函数后,map文件就变成了第三张图片的样子,fpumathtable就不见了。请问这是怎么回事?还有一个问题:三角函数无法调用快速库,而反三角和log函数可以调用fpu快速库,这是怎么回事?