entered into RCS

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@1945 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/rtl.def b/gcc/rtl.def
index 17b9715..cdbfba6 100644 (file)
--- a/gcc/rtl.def
+++ b/gcc/rtl.def
@@ -236,7 +236,7 @@ DEF_RTL_EXPR(DEFINE_DELAY, "define_delay", "eE", 'x')
    Each gives a set of operations and associated delays.  The first three
    operands must be the same for each operation for the same function unit.
 
-   All delays are specified in units of COST_PER_CYCLE.
+   All delays are specified in cycles.
 
    1st operand: Name of function unit (mostly for documentation)
    2nd operand: Number of identical function units in CPU
@@ -250,19 +250,21 @@ DEF_RTL_EXPR(DEFINE_DELAY, "define_delay", "eE", 'x')
                executing this operation.  The meaning depends on whether or
                not the next operand is supplied.
    7th operand: If this operand is not specified, the 6th operand gives the
-               cost of scheduling another operation on this unit while a
-               previous one is active.  A value of zero should be used for a
-               pipelined unit.  If only one operation can be executed a time
-               and the unit is busy for the entire time, the 3rd operand
-               should be specified as 1 and the 6th and 7th operands will
-               be ignored.
+               number of cycles after the instruction matching the 4th
+               operand begins using the function unit until a subsequent
+               insn can begin.  A value of zero should be used for a
+               unit with no issue constraints.  If only one operation can
+               be executed a time and the unit is busy for the entire time,
+               the 3rd operand should be specified as 1, the 6th operand
+               sould be specified as 0, and the 7th operand should not
+               be specified.
 
                If this operand is specified, it is a list of attribute
                expressions.  If an insn for which any of these expressions
                is true is currently executing on the function unit, the
-               delay will be given by the 6th operand.  Otherwise, the
-               insn can be immediately scheduled (subject to the limit on
-               the number of simultaneous operations executing on the
+               issue delay will be given by the 6th operand.  Otherwise,
+               the insn can be immediately scheduled (subject to the limit
+               on the number of simultaneous operations executing on the
                unit.)  */
 DEF_RTL_EXPR(DEFINE_FUNCTION_UNIT, "define_function_unit", "siieiiV", 'x')