diff options
Diffstat (limited to 'include/llvm/CodeGen/SelectionDAGNodes.h')
| -rw-r--r-- | include/llvm/CodeGen/SelectionDAGNodes.h | 10 |
1 files changed, 4 insertions, 6 deletions
diff --git a/include/llvm/CodeGen/SelectionDAGNodes.h b/include/llvm/CodeGen/SelectionDAGNodes.h index ad485103fb..942c169ed9 100644 --- a/include/llvm/CodeGen/SelectionDAGNodes.h +++ b/include/llvm/CodeGen/SelectionDAGNodes.h @@ -242,14 +242,11 @@ namespace ISD { // remainder result. SDIVREM, UDIVREM, - // CARRY_FALSE - This node is used when folding other nodes, - // like ADDC/SUBC, which indicate the carry result is always false. - CARRY_FALSE, - // Carry-setting nodes for multiple precision addition and subtraction. // These nodes take two operands of the same value type, and produce two // results. The first result is the normal add or sub result, the second - // result is the carry flag result. + // result is the carry flag result (type i1 or whatever it got expanded to + // for the target, value 0 or 1). ADDC, SUBC, // Carry-using nodes for multiple precision addition and subtraction. These @@ -258,7 +255,8 @@ namespace ISD { // produce two results; the normal result of the add or sub, and the output // carry flag. These nodes both read and write a carry flag to allow them // to them to be chained together for add and sub of arbitrarily large - // values. + // values. The carry flag (input and output) has type i1 or whatever it + // got expanded to for the target, and has value 0 or 1. ADDE, SUBE, // RESULT, BOOL = [SU]ADDO(LHS, RHS) - Overflow-aware nodes for addition. |