[Issue 4155] return of NaN to temporary fails equality test

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=4155


yebblies <yebblies at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |pull
                 CC|                            |yebblies at gmail.com
           Platform|Other                       |x86
         AssignedTo|nobody at puremagic.com        |yebblies at gmail.com
         OS/Version|Windows                     |All
           Severity|normal                      |critical


--- Comment #1 from yebblies <yebblies at gmail.com> 2012-02-24 01:42:51 EST ---
https://github.com/D-Programming-Language/dmd/pull/760

When T is a float or double, and in memory, dmd loads it to gp registers,
doubles it, then tests for zero.  When it's in ST(0), dmd uses fucompp to test
but the code that tests the flags is unaware of this and doesn't check the zero
flag to see if it was a nan comparison.

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