[llvm-commits] Case Ranges: 'switchr' is supported by llc now!

[Stepan Dyatkovskiy]

Hi all!

Please find the latest patches that adds support for new 'switchr' 
instruction (switch on case ranges).

Latest patch contains the next changes relative to the previous 
'switchr' patches:
-- SwitchRInst::[Const]CaseIt::getClusterAndGoNext - removed.
-- Added restriction for SwitchRInst constructors: "Cases" collection 
must contain non-empty, non-overlapped, ascending ordered 
range+successor pairs.
-- SwitchRInst::addCase automatically merges cases if possible. So on 
output you got optimized switchr always. See switchr.ll regression test 
as example.
-- LLParser: added diagnostics for switchr instruction for case when 
cases are overlapped. It also sort the cases before addCase operation.
-- SelectionDAGBuilder now supports SwitchRInst! That means that ./llc 
produces *valid* code for IR with 'switchr' instruction. See 
switchr-llc-test.ll regression test for details.

There are two patches:
-- Patch with instruction itself.
-- Patch with regression tests.

Note, 'switchr' patch doesn't affect existing functionality. Since it is 
new instruction, not an upd for any existing instructions.

-Stepan
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