Emulation Library; Overview - Epson S5U1C17001C Manual

Cmos 16-bit single chip microcomputer, c compiler package for s1c17 family

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7.2 Emulation library

The S1C17 Family C Compiler Package includes the emulation library (libgcc.a, libgccM.a, libgccMD.a)

that supports the arithmetic operation, comparison, and type conversion of single-precision (32-bit) and double-

precision (64-bit) floating-point numbers that conform to IEEE format, integer multiplication/division/sift

operations, and long long-type addition/subtraction. The libgcc.a library does not use coprocessor instructions;

the libgccM.a library uses multiplication coprocessor instructions; the libgccMD.a library uses multiplication,

division, and remainder coprocessor instructions. These libraries provide the same functions. The xgcc C compiler

calls up functions from this library when a floating-point number, long long data or integer calculation is

performed. Since library functions exchange data via a designated general-purpose register/stack, they can be called

from an assembly source. To use emulation library functions, specify libgcc.a (libgccM.a, libgccMD.a) and

libc.a when linking.

registers used in the libraries

• The registers %r0 to %r7 are used.

• The registers %r4 to %r7 are protected by saving to the stack before execution of a function and by restoring

from the stack after completion of the function.

S5U1C17001C ManUal

(C COMPilEr PaCkagE fOr S1C17 faMily) (Ver. 1.5.0)