Here is an explanation of implicit calls to library routines.
MULSI3_LIBCALL
__mulsi3,
a function defined in `libgcc.a'.
DIVSI3_LIBCALL
__divsi3, a
function defined in `libgcc.a'.
UDIVSI3_LIBCALL
__udivsi3, a
function defined in `libgcc.a'.
MODSI3_LIBCALL
__modsi3, a function defined in `libgcc.a'.
UMODSI3_LIBCALL
__umodsi3, a function defined in `libgcc.a'.
MULDI3_LIBCALL
__muldi3,
a function defined in `libgcc.a'.
DIVDI3_LIBCALL
__divdi3, a
function defined in `libgcc.a'.
UDIVDI3_LIBCALL
__udivdi3, a
function defined in `libgcc.a'.
MODDI3_LIBCALL
__moddi3, a function defined in `libgcc.a'.
UMODDI3_LIBCALL
__umoddi3, a function defined in `libgcc.a'.
INIT_TARGET_OPTABS
init_optabs calls this macro after
initializing all the normal library routines.
TARGET_EDOM
EDOM on the target machine, as a C integer constant
expression. If you don't define this macro, GNU CC does not attempt to
deposit the value of EDOM into errno directly. Look in
`/usr/include/errno.h' to find the value of EDOM on your
system.
If you do not define TARGET_EDOM, then compiled code reports
domain errors by calling the library function and letting it report the
error. If mathematical functions on your system use matherr when
there is an error, then you should leave TARGET_EDOM undefined so
that matherr is used normally.
GEN_ERRNO_RTX
errno. (On certain systems,
errno may not actually be a variable.) If you don't define this
macro, a reasonable default is used.
TARGET_MEM_FUNCTIONS
memcpy and memset
rather than the BSD functions bcopy and bzero.
LIBGCC_NEEDS_DOUBLE
float arguments cannot be passed to
library routines (so they must be converted to double). This
macro affects both how library calls are generated and how the library
routines in `libgcc1.c' accept their arguments. It is useful on
machines where floating and fixed point arguments are passed
differently, such as the i860.
FLOAT_ARG_TYPE
float. (By default, they use a union
of float and int.)
The obvious choice would be float---but that won't work with
traditional C compilers that expect all arguments declared as float
to arrive as double. To avoid this conversion, the library routines
ask for the value as some other type and then treat it as a float.
On some systems, no other type will work for this. For these systems,
you must use LIBGCC_NEEDS_DOUBLE instead, to force conversion of
the values double before they are passed.
FLOATIFY (passed-value)
float argument as a float instead of the type it was
passed as. The default is an expression which takes the float
field of the union.
FLOAT_VALUE_TYPE
float. (By default, they
use int.)
The obvious choice would be float---but that won't work with
traditional C compilers gratuitously convert values declared as
float into double.
INTIFY (float-value)
float-returning library routine should be packaged in order to
return it. These functions are actually declared to return type
FLOAT_VALUE_TYPE (normally int).
These values can't be returned as type float because traditional
C compilers would gratuitously convert the value to a double.
A local variable named intify is always available when the macro
INTIFY is used. It is a union of a float field named
f and a field named i whose type is
FLOAT_VALUE_TYPE or int.
If you don't define this macro, the default definition works by copying
the value through that union.
nongcc_SI_type
SImode in the system's own C compiler.
You need not define this macro if that type is long int, as it usually
is.
nongcc_word_type
long int, as it usually
is.
perform_...
float and double in the
library routines in `libgcc1.c'. See that file for a full list
of these macros and their arguments.
On most machines, you don't need to define any of these macros, because
the C compiler that comes with the system takes care of doing them.
NEXT_OBJC_RUNTIME
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