[mips][msa] Implemented build_vector using ldi, fill, and custom SelectionDAG nodes (VSPLAT and VSPLATD)

Note: There's a later patch on my branch that re-implements this to select
build_vector without the custom SelectionDAG nodes. The future patch avoids
the constant-folding problems stemming from the custom node (i.e. it doesn't
need to re-implement all the DAG combines related to BUILD_VECTOR).

Changes to MIPS specific SelectionDAG nodes:
* Added VSPLAT
    This is a special case of BUILD_VECTOR that covers the case the
    BUILD_VECTOR is a splat operation.
* Added VSPLATD
    This is a special case of VSPLAT that handles the cases when v2i64 is legal


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191191 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 7 insertions, 1 deletions

diff --git a/lib/Target/Mips/MipsISelLowering.h b/lib/Target/Mips/MipsISelLowering.h
index 85aa162fb4..57b5603ac2 100644
--- a/lib/Target/Mips/MipsISelLowering.h
+++ b/lib/Target/Mips/MipsISelLowering.h
@@ -152,12 +152,18 @@ namespace llvm {
       SETCC_DSP,
       SELECT_CC_DSP,
 
-      // Vector comparisons
+      // Vector comparisons.
       VALL_ZERO,
       VANY_ZERO,
       VALL_NONZERO,
       VANY_NONZERO,
 
+      // Special case of BUILD_VECTOR where all elements are the same.
+      VSPLAT,
+      // Special case of VSPLAT where the result is v2i64, the operand is
+      // constant, and the operand fits in a signed 10-bits value.
+      VSPLATD,
+
       // Load/Store Left/Right nodes.
       LWL = ISD::FIRST_TARGET_MEMORY_OPCODE,
       LWR,