tree c98000f9b95d61948ebdd01a787606c61f301734
parent d9b4815e473af943ed44405987c2b4bce98b65c3
author Nicolas Capens <capn@google.com> 1661881934 -0400
committer Nicolas Capens <nicolascapens@google.com> 1661968237 +0000

Eliminate incorrect Exponent() function

The Exponent() helper function did not return the actual exponent of an
IEEE 754 single-precision value. The exponent bias is 127, not 126, but
the latter is correct for implementing frexp() since the significant is
in the [0.5, 1.0) range while mantissas represent [1.0, 2.0). So the
Exponent() function was eliminated and its logic inlined in Frexp().

Bug: b/243791551
Change-Id: I18eaa6930c4583468e6129126d64227f30fd9696
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/67889
Kokoro-Result: kokoro <noreply+kokoro@google.com>
Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>