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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 |