Tests for "absolute" intrinsics#1033
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adpaco-aws merged 2 commits intomodel-checking:mainfrom Apr 13, 2022
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danielsn
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| kani::assume(!x.is_nan()); | ||
| let abs_x = unsafe { std::intrinsics::fabsf32(x) }; | ||
| if x < 0.0 { | ||
| assert!(-x == abs_x); |
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At first I was surprised that this was == and not diff < epsilon but I see that floating point has an explicit sign bit https://en.wikipedia.org/wiki/Floating-point_arithmetic#IEEE_754:_floating_point_in_modern_computers
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Description of changes:
The implementation of "absolute" intrinsics (
fabsf32andfabsf64) relies on CBMC'sfabsfandfabs. This PR adds tests for them.Resolved issues:
Part of #727
Call-outs:
Testing:
How is this change tested? Adds two tests.
Is this a refactor change? No.
Checklist
By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 and MIT licenses.