In http://reviews.llvm.org/D8989#173900, @hfinkel wrote:

> '!' is used as the prefix to indicate disabling (not '-' as you have here).


Hmm...how does this ever work as advertised?

  $ gcc -O2 -ffast-math -mrecip=!sqrt recip.c 
  bash: !sqrt: event not found


http://reviews.llvm.org/D8989

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