This is the mail archive of the
gcc@gcc.gnu.org
mailing list for the GCC project.
Re: FWD: FLOATING-POINT CONSISTENCY, -FFLOAT-STORE, AND X86
- To: ejr at CS dot Berkeley dot EDU (Edward Jason Riedy)
- Subject: Re: FWD: FLOATING-POINT CONSISTENCY, -FFLOAT-STORE, AND X86
- From: Joe Buck <jbuck at Synopsys dot COM>
- Date: Mon, 14 Dec 98 17:19:45 PST
- Cc: hjstein at bfr dot co dot il, egcs at cygnus dot com
> A little thought, planning, and lack of -O flags, and you can get huge
> benefits from the 80-bit cells.
It would seem that if we did 80-bit spills, then the -O flags would not
affect the results (assuming that the original code uses parentheses
to constrain the order of evaluation of FP expressions and that the
optimizer avoids transformations that can change numerical results,
such as pre-evaluating expressions with 64-bit that would otherwise
be evaluated using 80-bit precision at runtime).