Add codegen support for vector select (in the IR this means a select

with a vector condition); such selects become VSELECT codegen nodes.
This patch also removes VSETCC codegen nodes, unifying them with SETCC
nodes (codegen was actually often using SETCC for vector SETCC already).
This ensures that various DAG combiner optimizations kick in for vector
comparisons.  Passes dragonegg bootstrap with no testsuite regressions
(nightly testsuite as well as "make check-all").  Patch mostly by
Nadav Rotem.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139159 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 16 insertions, 0 deletions

diff --git a/include/llvm/CodeGen/ValueTypes.h b/include/llvm/CodeGen/ValueTypes.h
index 1676483..f314520 100644
--- a/include/llvm/CodeGen/ValueTypes.h
+++ b/include/llvm/CodeGen/ValueTypes.h
@@ -438,6 +438,21 @@ namespace llvm {
       return MVT::INVALID_SIMPLE_VALUE_TYPE;
     }
 
+    /// changeVectorElementTypeToInteger - Return a vector with the same number
+    /// of elements as this vector, but with the element type converted to an
+    /// integer type with the same bitwidth.
+    EVT changeVectorElementTypeToInteger() const {
+      if (!isSimple())
+        return changeExtendedVectorElementTypeToInteger();
+      MVT EltTy = getSimpleVT().getVectorElementType();
+      unsigned BitWidth = EltTy.getSizeInBits();
+      MVT IntTy = MVT::getIntegerVT(BitWidth);
+      MVT VecTy = MVT::getVectorVT(IntTy, getVectorNumElements());
+      assert(VecTy != MVT::INVALID_SIMPLE_VALUE_TYPE &&
+             "Simple vector VT not representable by simple integer vector VT!");
+      return VecTy;
+    }
+
     /// isSimple - Test if the given EVT is simple (as opposed to being
     /// extended).
     bool isSimple() const {
@@ -674,6 +689,7 @@ namespace llvm {
     // Methods for handling the Extended-type case in functions above.
     // These are all out-of-line to prevent users of this header file
     // from having a dependency on Type.h.
+    EVT changeExtendedVectorElementTypeToInteger() const;
     static EVT getExtendedIntegerVT(LLVMContext &C, unsigned BitWidth);
     static EVT getExtendedVectorVT(LLVMContext &C, EVT VT,
                                    unsigned NumElements);