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F29H859TU-Q1: How to use the asinf() function

Shuqing Zhou
Expert 3405 points

Part Number: F29H859TU-Q1

Hi team,

I ask this for my customer.

We use the demo in f29h85x-sdk_1_02_00_00\examples\rtlibs\fastmath\asinf_example, use the launchpad

1.we use the flash build configuration, either we define FASTMATH or not define FASTMATH, the test_ouput is 0 showed in CIO

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then we modifty the input variable, then we can get the correct asinf result

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Could you help to find the reason of this problem?

2. If i delete FASTMATH pre-define symbols and enable the -ffast -math, the result would incorrect, why this is happen?

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3. If I use the FASTMATH pre-define symbols and enable the -ffast -math, the result is correct, if customer want to use the ffmath lib, what they should do in their project?

For example, they needs to add the FASTMATH pre-define symbols, enable the  -ffast -math, any others they need to do?

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4. Add more questions from customer, if they don't enable the -ffast -math, it will generate the error that shows floating calculation is over flow, what's float math calculation is related to this?

BRs

Shuqing