diff options
| author | Hans-Peter Nilsson <hp@axis.com> | 2005-10-17 20:39:45 +0000 |
|---|---|---|
| committer | Hans-Peter Nilsson <hp@axis.com> | 2005-10-17 20:39:45 +0000 |
| commit | b239e954e4cddc9af4688d927ca090d75f43875c (patch) | |
| tree | 8a2a1f88d5029481be0a6ff7c8ffe3dd7ae55588 /gcc/doc | |
| parent | 7ed0ec16a74aeb766b61f9d8072118e22c1cbe68 (diff) | |
PR target/23424
* md.texi (Modifiers) <%>: Clarify that % doesn't work
after register allocation.
git-svn-id: https://gcc.gnu.org/svn/gcc/trunk@105517 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/doc')
| -rw-r--r-- | gcc/doc/md.texi | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/gcc/doc/md.texi b/gcc/doc/md.texi index 8bbc2d889ae..36b02739070 100644 --- a/gcc/doc/md.texi +++ b/gcc/doc/md.texi @@ -1552,7 +1552,10 @@ instruction is defined: GCC can only handle one commutative pair in an asm; if you use more, the compiler may fail. Note that you need not use the modifier if the two alternatives are strictly identical; this would only waste -time in the reload pass. +time in the reload pass. The modifier is not operational after +register allocation, so the result of @code{define_peephole2} +and @code{define_split}s performed after reload cannot rely on +@samp{%} to make the intended insn match. @cindex @samp{#} in constraint @item # |