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| author | Zack Weinberg <zackw@panix.com> | 2001-08-12 01:46:15 +0000 |
|---|---|---|
| committer | Zack Weinberg <zack@gcc.gnu.org> | 2001-08-12 01:46:15 +0000 |
| commit | 31cdd4996b4223793a65643fcbf69163c3623258 (patch) | |
| tree | 4a0e1181985ae01e6097206b29b38dff92c54a52 /gcc/doc/tm.texi | |
| parent | 2b2202656c555a659103f4ed7e140c5784613f33 (diff) | |
| download | gcc-31cdd4996b4223793a65643fcbf69163c3623258.zip gcc-31cdd4996b4223793a65643fcbf69163c3623258.tar.gz gcc-31cdd4996b4223793a65643fcbf69163c3623258.tar.bz2 | |
defaults.h: Define PREFERRED_STACK_BOUNDARY to STACK_BOUNDARY if not already defined.
* defaults.h: Define PREFERRED_STACK_BOUNDARY to
STACK_BOUNDARY if not already defined.
* calls.c, function.c, reload1.c, explow.c: Don't default
PREFERRED_STACK_BOUNDARY. Remove all #if/#ifdef on
PREFERRRED_STACK_BOUNDARY and/or STACK_BOUNDARY.
* explow.c (allocate_dynamic_stack_space): Change unsafe #if
to run-time test.
* doc/tm.texi: Document that STACK_BOUNDARY is required;
clarify difference between it and PREFERRED_STACK_BOUNDARY.
From-SVN: r44814
Diffstat (limited to 'gcc/doc/tm.texi')
| -rw-r--r-- | gcc/doc/tm.texi | 19 |
1 files changed, 10 insertions, 9 deletions
diff --git a/gcc/doc/tm.texi b/gcc/doc/tm.texi index 0de3768..60fc2d3 100644 --- a/gcc/doc/tm.texi +++ b/gcc/doc/tm.texi @@ -1015,18 +1015,19 @@ size of an integer. @findex STACK_BOUNDARY @item STACK_BOUNDARY -Define this macro if there is a guaranteed alignment for the stack -pointer on this machine. The definition is a C expression -for the desired alignment (measured in bits). This value is used as a -default if @code{PREFERRED_STACK_BOUNDARY} is not defined. +Define this macro to the minimum alignment enforced by hardware for the +stack pointer on this machine. The definition is a C expression for the +desired alignment (measured in bits). This value is used as a default +if @code{PREFERRED_STACK_BOUNDARY} is not defined. On most machines, +this should be the same as @code{PARM_BOUNDARY}. @findex PREFERRED_STACK_BOUNDARY @item PREFERRED_STACK_BOUNDARY -Define this macro if you wish to preserve a certain alignment for -the stack pointer. The definition is a C expression -for the desired alignment (measured in bits). If @code{STACK_BOUNDARY} is -also defined, this macro must evaluate to a value equal to or larger -than @code{STACK_BOUNDARY}. +Define this macro if you wish to preserve a certain alignment for the +stack pointer, greater than what the hardware enforces. The definition +is a C expression for the desired alignment (measured in bits). This +macro must evaluate to a value equal to or larger than +@code{STACK_BOUNDARY}. @findex FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN @item FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN |