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| author | geoffk <geoffk@138bc75d-0d04-0410-961f-82ee72b054a4> | 2000-07-18 00:23:50 +0000 |
|---|---|---|
| committer | geoffk <geoffk@138bc75d-0d04-0410-961f-82ee72b054a4> | 2000-07-18 00:23:50 +0000 |
| commit | 61bcb403a1ee309ea022232f09441c96c068b9a3 (patch) | |
| tree | c87034f77402afc1ffe5f2431783be7a58cbbd65 | |
| parent | 4ff7381280329eb3d6559dbe3be4e2f5fb000efa (diff) | |
| download | ppe42-gcc-61bcb403a1ee309ea022232f09441c96c068b9a3.tar.gz ppe42-gcc-61bcb403a1ee309ea022232f09441c96c068b9a3.zip | |
* extend.texi (Extended Asm): Mention that a memory clobber
does not count as a side-effect.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@35110 138bc75d-0d04-0410-961f-82ee72b054a4
| -rw-r--r-- | gcc/ChangeLog | 3 | ||||
| -rw-r--r-- | gcc/extend.texi | 5 |
2 files changed, 7 insertions, 1 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 8597b35b447..142e3874fc8 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,5 +1,8 @@ 2000-07-17 Geoffrey Keating <geoffk@cygnus.com> + * extend.texi (Extended Asm): Mention that a memory clobber + does not count as a side-effect. + * unroll.c (copy_loop_body): Fix one instance of using host arithmetic on the target; fixes loop-4 on a 32-bit -> 64-bit cross-compile. diff --git a/gcc/extend.texi b/gcc/extend.texi index 3b8899baa6a..6eefa624936 100644 --- a/gcc/extend.texi +++ b/gcc/extend.texi @@ -2558,7 +2558,10 @@ effect. But it is valid no matter what the machine. If your assembler instruction modifies memory in an unpredictable fashion, add @samp{memory} to the list of clobbered registers. This will cause GNU CC to not keep memory values cached in registers across -the assembler instruction. +the assembler instruction. You will also want to add the +@code{volatile} keyword if the memory affected is not listed in the +inputs or outputs of the @code{asm}, as the @samp{memory} clobber does +not count as a side-effect of the @code{asm}. You can put multiple assembler instructions together in a single @code{asm} template, separated either with newlines (written as |
