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Add some comments about my recent code generation change.

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code_exprn.m:
	Add some comments about my recent code generation change.
This commit is contained in:
Zoltan Somogyi
1996-08-04 23:26:24 +00:00
parent 40e727614d
commit b3710249de
1 changed files with 7 additions and 2 deletions
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9
compiler/code_exprn.m
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@@ -960,6 +960,11 @@ code_exprn__place_evaled(Rvals0, Var, Lval, Code) -->
_, Code)
).
% code_exprn__place_arg(Rval, MaybeLval, Lval, Code):
% generate the code required (if any) to materialize the value Rval
% in some location, and return that location as Lval. If MaybeLval
% is yes(Lval0), we must put the value into the location Lval0.
:- pred code_exprn__place_arg(rval, maybe(lval), lval, code_tree,
exprn_info, exprn_info).
:- mode code_exprn__place_arg(in, in, out, out, in, out) is det.
@@ -986,8 +991,8 @@ code_exprn__place_arg(Rval0, MaybeLval, Lval, Code) -->
code_exprn__add_lval_reg_dependencies(Lval),
{ Code = empty }
;
% If the value of the variable is a constant or
% is built up by operations involving only constants,
% If the value is a constant or is built up
% by operations involving only constants,
% get the constant form and assign that.
code_exprn__get_options(ExprnOpts),
{ code_exprn__expr_is_constant(Rval0, Vars0, ExprnOpts, Rval) }