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Re: Draft "Unsafe fp optimizations" project description.
- To: amylaar at redhat dot com, dewar at gnat dot com
- Subject: Re: Draft "Unsafe fp optimizations" project description.
- From: dewar at gnat dot com
- Date: Mon, 6 Aug 2001 21:32:02 -0400 (EDT)
- Cc: Gabriel dot Dos_Reis at sophia dot inria dot fr, gcc at gcc dot gnu dot org,gdosreis at sophia dot inria dot fr, toon at moene dot indiv dot nluug dot nl
<<It would also be rather dubious on the SH4, where single precision is
considerably faster than double precision.
>>
Not if you already have computed the double precision result. In other words
CSE could regard a*b as equivalent to double(a)*double(b). I agree this is
an unusual case, but certainly might occur.