[m-rev.] diff: make some int operations builtins.

[Julien Fischer]

On Fri, 1 Apr 2005, Zoltan Somogyi wrote:

> compiler/builtin_ops.m:
> 	Make int.plus, int.minus and int.times builtin operations, with
> 	the same implementations as int.+, int.- and int.*.
>

In which case, I intend to add the following as well:

Estimated hours taken: 0.1
Branches: main

compiler/const_prop.m:
	Perform constant propagation of int.plus/2, int.minus/2
	and int.times/2.

Julien.

Index: compiler/const_prop.m
===================================================================
RCS file: /home/mercury1/repository/mercury/compiler/const_prop.m,v
retrieving revision 1.27
diff -u -r1.27 const_prop.m
--- compiler/const_prop.m	24 Mar 2005 02:00:19 -0000	1.27
+++ compiler/const_prop.m	1 Apr 2005 05:42:30 -0000
@@ -217,6 +217,21 @@
 	YVal \= 0,
 	ZVal = XVal // YVal.

+evaluate_det_call("int", "plus", 0, [X, Y, Z], Z, int_const(ZVal)) :-
+	X ^ arg_inst = bound(_XUniq, [functor(int_const(XVal), [])]),
+	Y ^ arg_inst = bound(_YUniq, [functor(int_const(YVal), [])]),
+	ZVal = XVal + YVal.
+
+evaluate_det_call("int", "minus", 0, [X, Y, Z], Z, int_const(ZVal)) :-
+	X ^ arg_inst = bound(_XUniq, [functor(int_const(XVal), [])]),
+	Y ^ arg_inst = bound(_YUniq, [functor(int_const(YVal), [])]),
+	ZVal = XVal - YVal.
+
+evaluate_det_call("int", "times", 0, [X, Y, Z], Z, int_const(ZVal)) :-
+	X ^ arg_inst = bound(_XUniq, [functor(int_const(XVal), [])]),
+	Y ^ arg_inst = bound(_YUniq, [functor(int_const(YVal), [])]),
+	ZVal = XVal * YVal.
+
 evaluate_det_call("int", "unchecked_quotient", 0, [X, Y, Z], Z,
 		int_const(ZVal)) :-
 	X ^ arg_inst = bound(_XUniq, [functor(int_const(XVal), [])]),
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