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tm.texi: document STACK_SAVEAREA_MODE.

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md.texi: update save_stack_* pattern description.

From-SVN: r20844
This commit is contained in:
David Edelsohn 1998-06-30 10:45:56 -04:00
parent 2067f1f59d
commit 73c8090f8e
2 changed files with 22 additions and 8 deletions
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17
gcc/md.texi
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@ -2412,14 +2412,15 @@ such required data.
@end enumerate
When saving the stack pointer, operand 0 is the save area and operand 1
is the stack pointer. The mode used to allocate the save area is the
mode of operand 0. You must specify an integral mode, or
@code{VOIDmode} if no save area is needed for a particular type of save
(either because no save is needed or because a machine-specific save
area can be used). Operand 0 is the stack pointer and operand 1 is the
save area for restore operations. If @samp{save_stack_block} is
defined, operand 0 must not be @code{VOIDmode} since these saves can be
arbitrarily nested.
is the stack pointer. The mode used to allocate the save area defaults
to @code{Pmode} but you can override that choice by defining the
@code{STACK_SAVEAREA_MODE} macro (@pxref{Storage_Layout}). You must
specify an integral mode, or @code{VOIDmode} if no save area is needed
for a particular type of save (either because no save is needed or
because a machine-specific save area can be used). Operand 0 is the
stack pointer and operand 1 is the save area for restore operations. If
@samp{save_stack_block} is defined, operand 0 must not be
@code{VOIDmode} since these saves can be arbitrarily nested.
A save area is a @code{mem} that is at a constant offset from
@code{virtual_stack_vars_rtx} when the stack pointer is saved for use by

13
gcc/tm.texi
View file

@ -979,6 +979,19 @@ this size or smaller can be used for structures and unions with the
appropriate sizes. If this macro is undefined, @code{GET_MODE_BITSIZE
(DImode)} is assumed.
@findex STACK_SAVEAREA_MODE
@item STACK_SAVEAREA_MODE (@var{save_level})
If defined, an expression of type @code{enum machine_mode} that
specifies the mode of a @code{save_stack_@var{level}} named pattern
(@pxref{Standard Names}). @var{save_level} is one of @code{SAVE_BLOCK},
@code{SAVE_FUNCTION}, or @code{SAVE_NONLOCAL} and selects which of the
three named patterns is having its mode specified.
You need not define this macro if it always returns @code{Pmode}. You
would most commonly define this macro if the
@code{save_stack_@var{level}} patterns need to support both a 32- and a
64-bit mode.
@findex CHECK_FLOAT_VALUE
@item CHECK_FLOAT_VALUE (@var{mode}, @var{value}, @var{overflow})
A C statement to validate the value @var{value} (of type