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- Document SLOW_UNALIGNED_ACCESS change.

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- Update copyright.

From-SVN: r31212
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David Edelsohn 2000-01-04 15:10:19 -05:00
parent e1565e6588
commit 5fad8ebf24
1 changed files with 6 additions and 5 deletions
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11
gcc/tm.texi
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@ -1,4 +1,4 @@
@c Copyright (C) 1988,89,92,93,94,96,97,98,1999 Free Software Foundation, Inc. @c Copyright (C) 1988,89,92-99,2000 Free Software Foundation, Inc.
@c This is part of the GCC manual. @c This is part of the GCC manual.
@c For copying conditions, see the file gcc.texi. @c For copying conditions, see the file gcc.texi.
@ -4719,10 +4719,11 @@ recognize RTL structures like this:
and likewise for @code{HImode}. and likewise for @code{HImode}.
@findex SLOW_UNALIGNED_ACCESS @findex SLOW_UNALIGNED_ACCESS
@item SLOW_UNALIGNED_ACCESS @item SLOW_UNALIGNED_ACCESS (@var{mode}, @var{alignment})
Define this macro to be the value 1 if unaligned accesses have a cost Define this macro to be the value 1 if memory accesses described by the
many times greater than aligned accesses, for example if they are @var{mode} and @var{alignment} parameters have a cost many times greater
emulated in a trap handler. than aligned accesses, for example if they are emulated in a trap
handler.
When this macro is non-zero, the compiler will act as if When this macro is non-zero, the compiler will act as if
@code{STRICT_ALIGNMENT} were non-zero when generating code for block @code{STRICT_ALIGNMENT} were non-zero when generating code for block