diff options
| author | Mark Mitchell <mark@codesourcery.com> | 2001-01-02 18:15:18 +0000 |
|---|---|---|
| committer | Mark Mitchell <mmitchel@gcc.gnu.org> | 2001-01-02 18:15:18 +0000 |
| commit | 330aa9a385a89f4d46225e10522c3b2f251305e5 (patch) | |
| tree | 04976a909b1ea2e838e9a78e907260001947357d /gcc/tree.def | |
| parent | eeebb824377d936450adefc8ea868e23ae35b9ef (diff) | |
| download | gcc-330aa9a385a89f4d46225e10522c3b2f251305e5.zip gcc-330aa9a385a89f4d46225e10522c3b2f251305e5.tar.gz gcc-330aa9a385a89f4d46225e10522c3b2f251305e5.tar.bz2 | |
* tree.def (TRUTH_NOT_EXPR): Improve documentation.
From-SVN: r38631
Diffstat (limited to 'gcc/tree.def')
| -rw-r--r-- | gcc/tree.def | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/gcc/tree.def b/gcc/tree.def index c61a5ff..23fda18 100644 --- a/gcc/tree.def +++ b/gcc/tree.def @@ -620,11 +620,15 @@ DEFTREECODE (BIT_AND_EXPR, "bit_and_expr", '2', 2) DEFTREECODE (BIT_ANDTC_EXPR, "bit_andtc_expr", '2', 2) DEFTREECODE (BIT_NOT_EXPR, "bit_not_expr", '1', 1) -/* Combination of boolean values or of integers considered only - as zero or nonzero. ANDIF and ORIF allow the second operand - not to be computed if the value of the expression is determined - from the first operand. AND, OR, and XOR always compute the second - operand whether its value is needed or not (for side effects). */ +/* ANDIF and ORIF allow the second operand not to be computed if the + value of the expression is determined from the first operand. AND, + OR, and XOR always compute the second operand whether its value is + needed or not (for side effects). The operand may have + BOOLEAN_TYPE or INTEGER_TYPE. In either case, the argument will be + either zero or one. For example, a TRUTH_NOT_EXPR will never have + a INTEGER_TYPE VAR_DECL as its argument; instead, a NE_EXPR will be + used to compare the VAR_DECL to zero, thereby obtaining a node with + value zero or one. */ DEFTREECODE (TRUTH_ANDIF_EXPR, "truth_andif_expr", 'e', 2) DEFTREECODE (TRUTH_ORIF_EXPR, "truth_orif_expr", 'e', 2) DEFTREECODE (TRUTH_AND_EXPR, "truth_and_expr", 'e', 2) |