CVS commit: src/lib/libm/src

["David Laight" <dsl%netbsd.org@localhost>]

Module Name:    src
Committed By:   dsl
Date:           Sun Mar 16 22:30:44 UTC 2014

Modified Files:
        src/lib/libm/src: s_exp2f.c

Log Message:
Fix overflow and underflow on i386.
The return value of a 'float' function is in the x87 %st(0) register.
This is an 80bit 'long double' register.
If you multiply 0x1p100f by 0x1p100f the caller sees 0x1p200 - not the
  expected infinity.
So use a 'double' value which goes through a store-load sequence to generate
  the required exception and value.


To generate a diff of this commit:
cvs rdiff -u -r1.1 -r1.2 src/lib/libm/src/s_exp2f.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.