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Summary: pointer arithmetic on ia32 uses signed divide
Product: gcc
Version: 2.96 (redhat)
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassigned at gcc dot gnu do
--- Comment #1 from j3p0uk at hotmail dot com 2005-11-09 14:51 ---
Created an attachment (id=10186)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=10186&action=view)
Test source (.i)
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24756
--- Comment #4 from j3p0uk at hotmail dot com 2005-11-09 17:25 ---
The test case was a simple test case where I tried to show the mathematical
behaviour in as simple a way as possible.
The reason I thought that this may be a bug is because the behaviour on a
64-bit system is different
--- Comment #6 from j3p0uk at hotmail dot com 2005-11-10 13:49 ---
I was not intending to show a correct fix for the problem, my simple test
program was merely intended to show that given sufficient distance between 2
pointers the result from ptr_a - ptr_b can be incorrect. I am not
--- Comment #7 from j3p0uk at hotmail dot com 2005-11-10 13:54 ---
Created an attachment (id=10201)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=10201&action=view)
More correct test program
Here is a test program designed to show the problem more clearly. When run the
--- Comment #9 from j3p0uk at hotmail dot com 2005-11-10 14:02 ---
Sorry - I don't mean to pester you, I would just like to clarify your final
point.
What you are saying is that:
Pointer arithmetic is only valid on elements of the same array that are
adjacent, and that any other
