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Diffstat (limited to 'gcc/fold-const.c')
| -rw-r--r-- | gcc/fold-const.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/gcc/fold-const.c b/gcc/fold-const.c index 3a7053e..02f4128 100644 --- a/gcc/fold-const.c +++ b/gcc/fold-const.c @@ -2828,6 +2828,29 @@ pedantic_omit_one_operand (tree type, tree result, tree omitted) return pedantic_non_lvalue (t); } + +/* Return a tree for the case when the result of an expression is RESULT + converted to TYPE and OMITTED1 and OMITTED2 were previously operands + of the expression but are now not needed. + + If OMITTED1 or OMITTED2 has side effects, they must be evaluated. + If both OMITTED1 and OMITTED2 have side effects, OMITTED1 is + evaluated before OMITTED2. Otherwise, if neither has side effects, + just do the conversion of RESULT to TYPE. */ + +tree +omit_two_operands (tree type, tree result, tree omitted1, tree omitted2) +{ + tree t = fold_convert (type, result); + + if (TREE_SIDE_EFFECTS (omitted2)) + t = build2 (COMPOUND_EXPR, type, omitted2, t); + if (TREE_SIDE_EFFECTS (omitted1)) + t = build2 (COMPOUND_EXPR, type, omitted1, t); + + return TREE_CODE (t) != COMPOUND_EXPR ? non_lvalue (t) : t; +} + /* Return a simplified tree node for the truth-negation of ARG. This never alters ARG itself. We assume that ARG is an operation that |