Re: [Pharo-users] Set Rounding mode for IEEE floating point operations

I actually made progress: It works like a charm! Basically, I implemented the same code as you. Testing is straightforward (using the constant values from libc): current := LibC fegetround. LibC fesetround: FE_DOWNWARDS. v1 := 1.0/10.0. LibC feesetround: FE_UPWARDS. v2 := 1.0/10.0. LibC feesetround: current. v1 < v2. "true"

​but apparently nothing happens when you do : LibC uniqueInstance fesetround: 1024. LibC uniqueInstance fegetround. always return 0.​

This is expected, since the fesetround function returns 0 only if the set operation was successful. Thanks again for your support! Best, Steffen