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| author | Hans-Peter Nilsson <hp@axis.com> | 2005-10-17 20:39:45 +0000 |
|---|---|---|
| committer | Hans-Peter Nilsson <hp@gcc.gnu.org> | 2005-10-17 20:39:45 +0000 |
| commit | be3914df4cc863fa52e3b74ad84ee683a4621e76 (patch) | |
| tree | 8a2a1f88d5029481be0a6ff7c8ffe3dd7ae55588 /gcc/doc/md.texi | |
| parent | b3fdec9ea50940a23eb1a82be77aba3aa178a6de (diff) | |
| download | gcc-be3914df4cc863fa52e3b74ad84ee683a4621e76.zip gcc-be3914df4cc863fa52e3b74ad84ee683a4621e76.tar.gz gcc-be3914df4cc863fa52e3b74ad84ee683a4621e76.tar.bz2 | |
re PR target/23424 (cris.md rtl canonicalization bug)
PR target/23424
* md.texi (Modifiers) <%>: Clarify that % doesn't work
after register allocation.
From-SVN: r105517
Diffstat (limited to 'gcc/doc/md.texi')
| -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 8bbc2d8..36b0273 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 # |