Do not legalize large setcc with setcce, introduce setcccarry and do it with usubo/setcccarry.

Summary:
This is a continuation of the work started in D29872 . Passing the carry down as a value rather than as a glue allows for further optimizations. Introducing setcccarry makes the use of addc/subc unecessary and we can start the removal process.

This patch only introduce the optimization strictly required to get the same level of optimization as was available before nothing more.

Reviewers: jyknight, nemanjai, mkuper, spatel, RKSimon, zvi, bkramer

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D33374

llvm-svn: 304404

1 files changed, 1 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/TargetLoweringBase.cpp b/llvm/lib/CodeGen/TargetLoweringBase.cpp
index 3fc6bbc123f..900c0318b17 100644
--- a/llvm/lib/CodeGen/TargetLoweringBase.cpp
+++ b/llvm/lib/CodeGen/TargetLoweringBase.cpp
@@ -927,6 +927,7 @@ void TargetLoweringBase::initActions() {
     // ADDCARRY operations default to expand
     setOperationAction(ISD::ADDCARRY, VT, Expand);
     setOperationAction(ISD::SUBCARRY, VT, Expand);
+    setOperationAction(ISD::SETCCCARRY, VT, Expand);
 
     // These default to Expand so they will be expanded to CTLZ/CTTZ by default.
     setOperationAction(ISD::CTLZ_ZERO_UNDEF, VT, Expand);