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RE: help understanding behaviour of unsuffixed float constants


On Wed, 28 May 2014, Regan, Brian (EPC COE) wrote:

It might have been clearer if I included the objdump disassembly:

It should be apparent below the difference when I force the unsuffixed float to double (big value) and the second case where I have a second(but smaller) unsuffixed double. Based on the ASNI item highlighted in the original email (6.1.3.1 "An unsuffixed floating constant has type double.") this difference is unexpected. The concern is not a technical one - it is one of understanding and documenting the deviation from the ANSI standard.

Then you may also want to document that the compiler sometimes replaces
1+1 by 2 (objdump won't show you any addition).

--
Marc Glisse


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