[LLVMbugs] [Bug 10853] [AVX, perf?] suboptimal code generated to set 'all bits on' in ymm register

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Sat Sep 3 14:29:48 PDT 2011


Matt Pharr <matt at pharr.org> changed:

           What    |Removed                     |Added
             Status|NEW                         |RESOLVED
         Resolution|                            |INVALID

--- Comment #2 from Matt Pharr <matt at pharr.org> 2011-09-03 16:29:48 CDT ---
Yes.  I was thinking that a fp compare could used to get an 8-wide register of
on bits (I should have had vcmpeqps in the below), but I realize that won't
work if there happens to be a NaN value in the ymm register.  So marking this
as invalid.

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