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| author | Geoffrey Keating <geoffk@gcc.gnu.org> | 2001-07-02 20:02:54 +0000 |
|---|---|---|
| committer | Geoffrey Keating <geoffk@gcc.gnu.org> | 2001-07-02 20:02:54 +0000 |
| commit | 918a61248dc591d88ca58507f8bdbad20edbe404 (patch) | |
| tree | cae74d78e3737ad33b64159b25467f53d8953b26 /gcc/doc | |
| parent | f4ef873c3108a163d7789b137b391c3853c25011 (diff) | |
| download | gcc-918a61248dc591d88ca58507f8bdbad20edbe404.zip gcc-918a61248dc591d88ca58507f8bdbad20edbe404.tar.gz gcc-918a61248dc591d88ca58507f8bdbad20edbe404.tar.bz2 | |
[multiple changes]
2001-07-02 Geoffrey Keating <geoffk@redhat.com>
* doc/tm.texi (Frame Layout): Document STACK_PUSH_CODE.
* expr.c (emit_move_insn_1): Deal with non-default
STACK_PUSH_CODE.
* expr.c (emit_single_push_insn): Fix warning.
2001-07-02 Toshiyasu Morita <toshiyasu.morita@hsa.hitachi.com>
* expr.c (emit_move_insn_1): Avoid modifying
cfun->expr->x_stack_pointer when PUSH_ROUNDING is defined.
From-SVN: r43703
Diffstat (limited to 'gcc/doc')
| -rw-r--r-- | gcc/doc/tm.texi | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/gcc/doc/tm.texi b/gcc/doc/tm.texi index 89cd142..81aa6b9 100644 --- a/gcc/doc/tm.texi +++ b/gcc/doc/tm.texi @@ -2507,6 +2507,23 @@ When we say, ``define this macro if @dots{},'' it means that the compiler checks this macro only with @code{#ifdef} so the precise definition used does not matter. +@findex STACK_PUSH_CODE +@item STACK_PUSH_CODE + +This macro defines the operation used when something is pushed +on the stack. In RTL, a push operation will be +@code{(set (mem (STACK_PUSH_CODE (reg sp))) ...)} + +The choices are @code{PRE_DEC}, @code{POST_DEC}, @code{PRE_INC}, +and @code{POST_INC}. Which of these is correct depends on +the stack direction and on whether the stack pointer points +to the last item on the stack or whether it points to the +space for the next item on the stack. + +The default is @code{PRE_DEC} when @code{STACK_GROWS_DOWNWARD} is +defined, which is almost always right, and @code{PRE_INC} otherwise, +which is often wrong. + @findex FRAME_GROWS_DOWNWARD @item FRAME_GROWS_DOWNWARD Define this macro if the addresses of local variable slots are at negative |