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If you don't need to support CPUs over 10 years old, consider -march=pentium4 -mfpmath=sse or use the 64-bit OS and gcc.
[...]-----Original Message----- From: Robert Dewar [mailto:dewar@adacore.com] Sent: Sunday, May 08, 2011 11:13 To: Michael D. Berger Cc: gcc@gcc.gnu.org Subject: Re: numerical results differ after irrelevant code change
This kind of result is quite expected on an x86 using the old style (default) floating-point (becauae of extra precision in intermediate results).
How does the extra precision lead to the variable result? Also, is there a way to prevent it? It is a pain in regression testing.
-- Tim Prince
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