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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 3bd1c56..7c3d714 100644 --- a/gcc/doc/md.texi +++ b/gcc/doc/md.texi @@ -1589,7 +1589,10 @@ See, for example, the @samp{mulsi3} insn of the ARM@. Declares the instruction to be commutative for this operand and the following operand. This means that the compiler may interchange the two operands if that is the cheapest way to make all operands fit the -constraints. +constraints. @samp{%} applies to all alternatives and must appear as +the first character in the constraint. Only input operands can use +@samp{%}. + @ifset INTERNALS This is often used in patterns for addition instructions that really have only two operands: the result must go in one of the |