document these nodes, as they are nonobvious

llvm-svn: 21108
2005-04-06 04:21:29 +00:00 · 2005-04-06 04:21:29 +00:00 · 9953d17a44
parent 4fbb4af5d1
commit 9953d17a44
1 changed files with 5 additions and 1 deletions
--- a/llvm/include/llvm/CodeGen/SelectionDAGNodes.h
+++ b/llvm/include/llvm/CodeGen/SelectionDAGNodes.h
@ -90,7 +90,11 @@ namespace ISD {


    // Simple binary arithmetic operators.
-    ADD, SUB, MUL, MULHU, MULHS, SDIV, UDIV, SREM, UREM,
+    ADD, SUB, MUL, SDIV, UDIV, SREM, UREM,
+
+    // MULHU/MULHS - Multiply high - Multiply two integers of type iN, producing
+    // an unsigned/signed value of type i[2*n], then return the top part.
+    MULHU, MULHS,

    // Bitwise operators.
    AND, OR, XOR, SHL, SRA, SRL,