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RealView Assembler User's Guide
Preface Introduction Writing ARM Assembly Language Assembler Reference Command syntax
Obtaining a list of available options Specifying command‑line options with an environm AAPCS Floating‑point model Memory access attributes Pre‑executing a SET directive Splitting long LDMs and STMs Listing output to a file Project template options Controlling the output of diagnostic messages Controlling exception table generation Format of source lines Predefined register and coprocessor names Predeclared register names Predeclared extension register names Predeclared coprocessor names Built‑in variables and constants Symbols Symbol naming rules Variables Numeric constants Assembly time substitution of variables Labels Local labels Expressions, literals, and operators String expressions String literals Numeric expressions Numeric literals Floating‑point literals Register‑relative and program‑relative express Logical expressions Logical literals Operator precedence Unary operators Binary operators Diagnostic messages Interlocks IT block generation Thumb branch target alignment Using the C preprocessor ARM and Thumb Instructions Directives ReferenceFloating‑point model
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| Home > Assembler Reference > Command syntax > Floating‑point model | |||
There is an option to specify the floating‑point model:
‑‑fpmodemodelSelects the target floating‑point model and sets attributes to select the most suitable library when linking.
Note
This does not cause any changes to the code that you write.
model
ieee_fullAll facilities, operations, and representations guaranteed by the IEEE standard are available in single and double‑precision. Modes of operation can be selected dynamically at runtime.
ieee_fixedIEEE standard with round‑to‑nearest and no inexact exception.
ieee_no_fenvIEEE standard with round‑to‑nearest and no exceptions. This mode is compatible with the Java floating‑point arithmetic model.
stdIEEE finite values with denormals flushed to zero, round‑to‑nearest and no exceptions. It is C and C++ compatible. This is the default option.
Finite values are as predicted by the IEEE standard. It is not guaranteed that NaNs and infinities are produced in all circumstances defined by the IEEE model, or that when they are produced, they have the same sign. Also, it is not guaranteed that the sign of zero is that predicted by the IEEE model.
fastSome value altering optimizations, where accuracy is sacrificed to fast execution. This is not IEEE compatible, and is not standard C.
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