--- Comment #4 from bonzini at gnu dot org 2009-02-03 16:52 ---
more precisely, without -ffast-math gcc is not able to change abs(z) < 2 to
r*r+i*i < 4 and computes a square root on every iteration.
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bonzini at gnu dot org changed:
What|Removed |
--- Comment #3 from rguenth at gcc dot gnu dot org 2009-02-03 16:15 ---
Use -ffast-math.
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39087
--- Comment #2 from m4341 at abc dot se 2009-02-03 15:50 ---
Notice that the test cases have been executed on a Pentium III computer with
dual 866MHz processors.
The 'depth' variable in the example code has been set to produce comfortable
execution times for the forementioned computer.
--- Comment #1 from m4341 at abc dot se 2009-02-03 15:46 ---
Created an attachment (id=17234)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=17234&action=view)
Test cases for demonstrating performance impact.
The attached file contains code that is in it's current state requiring
X
