[PPC64LE] Fix wrong IR for vec_sld and vec_vsldoi

My original LE implementation of the vsldoi instruction, with its
altivec.h interfaces vec_sld and vec_vsldoi, produces incorrect
shufflevector operations in the LLVM IR.  Correct code is generated
because the back end handles the incorrect shufflevector in a
consistent manner.

This patch and a companion patch for Clang correct this problem by
removing the fixup from altivec.h and the corresponding fixup from the
PowerPC back end.  Several test cases are also modified to reflect the
now-correct LLVM IR.

llvm-svn: 214800

1 files changed, 12 insertions, 30 deletions

diff --git a/llvm/lib/Target/PowerPC/PPCISelLowering.cpp b/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
index 4028fedb6c5..8ddfd776726 100644
--- a/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
+++ b/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
@@ -1009,38 +1009,20 @@ int PPC::isVSLDOIShuffleMask(SDNode *N, bool isUnary, SelectionDAG &DAG) {
   unsigned ShiftAmt = SVOp->getMaskElt(i);
   if (ShiftAmt < i) return -1;
 
-  if (DAG.getTarget().getSubtargetImpl()->getDataLayout()->isLittleEndian()) {
-
-    ShiftAmt += i;
-
-    if (!isUnary) {
-      // Check the rest of the elements to see if they are consecutive.
-      for (++i; i != 16; ++i)
-        if (!isConstantOrUndef(SVOp->getMaskElt(i), ShiftAmt - i))
-          return -1;
-    } else {
-      // Check the rest of the elements to see if they are consecutive.
-      for (++i; i != 16; ++i)
-        if (!isConstantOrUndef(SVOp->getMaskElt(i), (ShiftAmt - i) & 15))
-          return -1;
-    }
-
-  } else {  // Big Endian
+  ShiftAmt -= i;
 
-    ShiftAmt -= i;
-
-    if (!isUnary) {
-      // Check the rest of the elements to see if they are consecutive.
-      for (++i; i != 16; ++i)
-        if (!isConstantOrUndef(SVOp->getMaskElt(i), ShiftAmt+i))
-          return -1;
-    } else {
-      // Check the rest of the elements to see if they are consecutive.
-      for (++i; i != 16; ++i)
-        if (!isConstantOrUndef(SVOp->getMaskElt(i), (ShiftAmt+i) & 15))
-          return -1;
-    }
+  if (!isUnary) {
+    // Check the rest of the elements to see if they are consecutive.
+    for (++i; i != 16; ++i)
+      if (!isConstantOrUndef(SVOp->getMaskElt(i), ShiftAmt+i))
+        return -1;
+  } else {
+    // Check the rest of the elements to see if they are consecutive.
+    for (++i; i != 16; ++i)
+      if (!isConstantOrUndef(SVOp->getMaskElt(i), (ShiftAmt+i) & 15))
+        return -1;
   }
+
   return ShiftAmt;
 }