http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51446
--- Comment #10 from lucier at math dot purdue.edu 2011-12-08 18:32:56 UTC --- Near the end of section 5.3.2 of Book E: Enhanced PowerPC Architecture Version 1.0 May 7, 2002 it says Any instruction that generates a QNaN as the result of a disabled Invalid Operation must generate this QNaN (i.e., 0x7FF8_0000_0000_0000). The string x7ff8 does not otherwise occur in the manual. The book PowerPC User Instruction Set Architecture Book I Version 2.02 January 28, 2005 has the same text. And a small test on my 10-year-old Mac Cube with a G4 powerpc processor shows that the results have sign bit = 0, i.e., the output is 9221120237041090560 9221120237041090560 So the result is architecture dependent. Blah. Brad
