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| author | hjl <hjl@138bc75d-0d04-0410-961f-82ee72b054a4> | 2012-06-22 17:10:58 +0000 |
|---|---|---|
| committer | hjl <hjl@138bc75d-0d04-0410-961f-82ee72b054a4> | 2012-06-22 17:10:58 +0000 |
| commit | e24005a24f41165050220aba1cabd6da49d255fb (patch) | |
| tree | 0003aa8aaa6d843a98cf3a0c9c56d2d6c8773942 /gcc/doc | |
| parent | 8ac8f5ae7dc6454744f1f6dee69b5a63e67112f5 (diff) | |
| download | gcc-e24005a24f41165050220aba1cabd6da49d255fb.tar.gz | |
Allow -mpreferred-stack-boundary=3 on x86-64
PR target/53383
* doc/invoke.texi: Add a warning for -mpreferred-stack-boundary=3.
* config/i386/i386.c (ix86_option_override_internal): Allow
-mpreferred-stack-boundary=3 for 64-bit if SSE is disabled.
* config/i386/i386.h (MIN_STACK_BOUNDARY): Set to 64 for 64-bit
if SSE is disabled.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@188893 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/doc')
| -rw-r--r-- | gcc/doc/invoke.texi | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index 387d6922f89..029a7ab0ad2 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -13577,6 +13577,12 @@ Attempt to keep the stack boundary aligned to a 2 raised to @var{num} byte boundary. If @option{-mpreferred-stack-boundary} is not specified, the default is 4 (16 bytes or 128 bits). +@strong{Warning:} When generating code for the x86-64 architecture with +SSE extensions disabled, @option{-mpreferred-stack-boundary=3} can be +used to keep the stack boundary aligned to 8 byte boundary. You must +build all modules with @option{-mpreferred-stack-boundary=3}, including +any libraries. This includes the system libraries and startup modules. + @item -mincoming-stack-boundary=@var{num} @opindex mincoming-stack-boundary Assume the incoming stack is aligned to a 2 raised to @var{num} byte |