Nios II Custom Instruction User Guide

ID 683242
Date 4/27/2020
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Document Table of Contents
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6.7.6. -frounding-math

From the GCC documentation:
“Disable transformations and optimizations that assume default floating point rounding behavior. This is round-to-zero for all floating point to integer conversions, and round-to-nearest for all other arithmetic truncations. This option should be specified for programs that change the FP rounding mode dynamically, or that may be executed with a non-default rounding mode. This option disables constant folding of floating point expressions at compile-time (which may be affected by rounding mode) and arithmetic transformations that are unsafe in the presence of sign-dependent rounding modes.”

Programmers are recommended to experiment with this option to determine how it affects their code.