Add legalization helper instructions.

The isplit_lohi instruction breaks an integer into two halves. This will typically be used to get the two halves of an `i64` value on 32-bit CPUs. The iconcat_lohi is the reverse operation. It reconstructs the `i64` from the low and high bits.
2016-09-27 16:22:32 -07:00
parent 2a2871e739
commit 29c449f117
6 changed files with 63 additions and 0 deletions
--- a/docs/langref.rst
+++ b/docs/langref.rst
@@ -823,6 +823,14 @@ Conversion operations
 .. autoinst:: fcvt_from_uint
 .. autoinst:: fcvt_from_sint

+Legalization operations
+-----------------------
+
+These instructions are used as helpers when legalizing types and operations for
+the target ISA.
+
+.. autoinst:: isplit_lohi
+.. autoinst:: iconcat_lohi

 Base instruction group
 ======================