On Mon, 14 Aug 2017, Manuel Lauss wrote:

---
v2: just use xor, as suggested by Maciej.  No size changes this time, but still
untested due to lack of hardfloat userland.

 D'oh, I was wondering what you meant by writing: "binary size reduction" 
and didn't get that you meant a size reduction of the binary object file 
produced rather than a transformation made by the compiler to the binary 
expression used.  That looks odd indeed -- have you tried comparing the 
output from `objdump -d' with and without the original patch applied?

 Your change looks obviously correct to me, however I can push it through 
GCC and/or glibc IEEE 754 math regression testing if it'll make you feel 
more confident about it.

 Meanwhile:

Reviewed-by: Maciej W. Rozycki <redacted>

  Maciej