StackOverflow2013

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PO
primarykey
Id
10917329
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
1
CommunityOwnedDate
CreationDate
2012-06-06T15:27:23.057
FavoriteCount
0
LastActivityDate
2018-01-09T14:40:05.307
LastEditDate
2018-01-09T14:40:05.307
LastEditorUserId
446106
OwnerUserId
974040
ParentId
10800304
PostTypeId
2
Score
1
ViewCount
0
LastEditorDisplayName
text
Body
So the answer appears to be no. The reason is that even if you use an identical series of computations in computing each variable, if there is any code between the steps of computing the value you may induce different rounding errors, as noted by the note in <a href="https://stackoverflow.com/a/10800881">@AProgrammer's response</a>. The issue is that while you might declare a n-bit floating point it may be stored in a larger register (The x87 uses an 80 bit register). If the value is pushed off the register and into memory to free the register for other operations, the value is then truncated (rounded? Where did my notes go...). When the value is brought back on to the register that lost precision carries through the rest of the computation. On the other hand another piece of code may go through the exact same steps in computing the value; however if the value is not pushed off the register (or is pushed off at a different place...) then you get a different truncation when it is stored in memory again. All this is IEEE approved according to the notes from the gcc mailing lists/bug reports. Since I haven't touched a register since the 80386, I can only guess at what the modern x86 and amd_64 processors have; but I'm guessing without hints to gcc that for the x86 it's using a basic x87 register set or a basic SSE register set. So the rule of thumb to use fabs(x-y) < epsilon; holds, which for CUnit is provided for in double format (and one could easily write a float version of the macro if one wanted to be as anal about things as I have a habit of getting) as noted by the post which @Martin Beckett commented on. 
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1. This table or related slice is empty.
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1. POcomparing floating point numbers in C for unit testing
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PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. USmwfearnley
UserOwnerUserId
1. USMichael Conlen
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1. POcomparing floating point numbers in C for unit testing
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