tree 52c0d15fc43e5e5c06312f5ba6bb6bade0ced83e
parent 84cfba17c2451f1a94ea7d812c1aba91e3606890
author Robert Griesemer <gri@golang.org> 1432252837 -0700
committer Robert Griesemer <gri@golang.org> 1432328725 +0000

math/big: fix Float.Float32 conversion for denormal corner cases

The existing code was incorrect for numbers that after rounding would
become the smallest denormal float32 (instead the result was 0). This
caused all.bash to fail if Float32() were used in the compiler for
constant arithmetic (there's currently a work-around - see also issue
10321.

This change fixes the implementation of Float.Float32 and adds
corresponding test cases. Float32 and Float64 diverge at this point.
For ease of review, this change only fixes Float32. Float64 will be
made to match in a subsequent change.

Fixes #10321.

Change-Id: Iccafe37c1593a4946bc552e4ad2045f69be62d80
Reviewed-on: https://go-review.googlesource.com/10350
Reviewed-by: Alan Donovan <adonovan@google.com>