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3.18.40. S/390 and zSeries Options

3.18.40 S/390 and zSeries Options

These are the ‘-m’ options defined for the S/390 and zSeries architecture.

-mhard-float
-msoft-float
Use (do not use) the hardware floating-point instructions and registers for floating-point operations. When -msoft-float is specified, functions in libgcc.a are used to perform floating-point operations. When -mhard-float is specified, the compiler generates IEEE floating-point instructions. This is the default.
-mhard-dfp
-mno-hard-dfp
Use (do not use) the hardware decimal-floating-point instructions for decimal-floating-point operations. When -mno-hard-dfp is specified, functions in libgcc.a