TI中文支持网我用的F28379D的开发板，在使用函数sqrt后，CCS建议我把fp_mode改成relaxed。请问relaxed和strict的区别是什么呢？
Susan Yang：
您可以参考
www.ti.com/…/spru514v.pdf
的 2.3.3 Miscellaneous Useful Options
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Susan Yang：
–fp_mode
The main compiler option is the –fp_mode option. This option controls the compiler's overall floating-point optimization strategy.–fp_mode=relaxed
Relaxed mode prioritizes speed over strict correctness. In relaxed mode, the compiler may perform speed optimizations at the expense of reducing the precision of some calculations, typically a tiny amount. For instance, (X/3) is not precisely equivalent to (X*(1.0/3)), but in relaxed mode, the compiler is allowed to make this transformation anyway, as multiplication is much faster than division.
–fp_mode=strict
Strict mode enforces strict IEEE-754 semantics, disabling all unsafe optimizations. The compiler will still perform optimizations that are provably safe, such as (X/2) -> (X*0.5). Using –fp_mode=strict sets –fp_reassoc=off by default.
software-dl.ti.com/…/sdto_cgt_floating_point_optimization.html
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EE搬砖工：
了解了，感谢！
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Susan Yang：
不客气~
