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-rw-r--r--gcc/doc/tm.texi2
1 files changed, 2 insertions, 0 deletions
diff --git a/gcc/doc/tm.texi b/gcc/doc/tm.texi
index 880884f5f52..7dfb46b3a0d 100644
--- a/gcc/doc/tm.texi
+++ b/gcc/doc/tm.texi
@@ -3817,6 +3817,8 @@ registers.
The value of this macro is the size, in bytes, of the area reserved for
arguments passed in registers for the function represented by @var{fndecl},
which can be zero if GCC is calling a library function.
+The argument @var{fndecl} can be the FUNCTION_DECL, or the type itself
+of the function.
This space can be allocated by the caller, or be a part of the
machine-dependent stack frame: @code{OUTGOING_REG_PARM_STACK_SPACE} says