• State Accepted Answer
  • +1 person also asked this people also asked this
  • Locked Locked
  • Replies 2 replies
  • Subscribers 22 subscribers
  • Views 1154 views
  • Users 0 members are here
2025 survey

We are running a survey to help us improve the experience for all of our members. If you see the survey appear, please take the time to tell us about your experience if you can.

Options
How was your experience today?
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

FuSa C library isinf function promotes float to double

RTL

Hello!

I am using the ARM FuSa C library version 6.6.A and ARM compiler for Embedded FuSa 6.16.2.

I have a variable defined as float, that I am using with the isinf(x) macro defined in math.h. Compiler gives me this warning "warning: implicit conversion increases floating-point precision: 'float' to 'double' [-Wdouble-promotion]" with a note "note: expanded from macro 'isinf'". To my understanding the macro should check the size of the input and decide if it uses __ARM_isinf() or __ARM_isinff(). I check the size of the variable before and it is 4 like it should be for a float variable.

Why does it still give me that warning? How do I get rid of that warning without ignoring it?

RTL

0