[X86] printConstant - add ConstantVector handling

Author: RKSimon

llvm/lib/Target/X86/X86MCInstLower.cpp

@@ -1536,6 +1536,15 @@ static void printConstant(const Constant *COp, unsigned BitWidth,
       else
         CS << "?";
     }
+  } else if (auto *CV = dyn_cast<ConstantVector>(COp)) {
+    unsigned EltBits = CV->getType()->getScalarSizeInBits();
+    unsigned E = std::min(BitWidth / EltBits, CV->getNumOperands());
+    assert((BitWidth % EltBits) == 0 && "Element size mismatch");
+    for (unsigned I = 0; I != E; ++I) {
+      if (I != 0)
+        CS << ",";
+      printConstant(CV->getOperand(I), EltBits, CS, PrintZero);
+    }
   } else {
     CS << "?";
   }
@@ -1550,18 +1559,15 @@ static void printZeroUpperMove(const MachineInstr *MI, MCStreamer &OutStreamer,
   CS << X86ATTInstPrinter::getRegisterName(DstOp.getReg()) << " = ";
 
   if (auto *C = X86::getConstantFromPool(*MI, 1)) {
-    if (isa<ConstantInt>(C) || isa<ConstantFP>(C) ||
-        isa<ConstantDataSequential>(C)) {
-      CS << "[";
-      printConstant(C, SclWidth, CS);
-      for (int I = 1, E = VecWidth / SclWidth; I < E; ++I) {
-        CS << ",";
-        printConstant(C, SclWidth, CS, true);
-      }
-      CS << "]";
-      OutStreamer.AddComment(CS.str());
-      return; // early-out
+    CS << "[";
+    printConstant(C, SclWidth, CS);
+    for (int I = 1, E = VecWidth / SclWidth; I < E; ++I) {
+      CS << ",";
+      printConstant(C, SclWidth, CS, true);
     }
+    CS << "]";
+    OutStreamer.AddComment(CS.str());
+    return; // early-out
   }
 
   // We didn't find a constant load, fallback to a shuffle mask decode.

llvm/test/CodeGen/X86/widen_shuffle-1.ll

@@ -105,7 +105,7 @@ define void @shuf5(ptr %p) nounwind {
 ; X86-LABEL: shuf5:
 ; X86:       # %bb.0:
 ; X86-NEXT:    movl {{[0-9]+}}(%esp), %eax
-; X86-NEXT:    movsd {{.*#+}} xmm0 = mem[0],zero
+; X86-NEXT:    movsd {{.*#+}} xmm0 = [33,33,33,33,33,33,33,33,0,0,0,0,0,0,0,0]
 ; X86-NEXT:    movsd %xmm0, (%eax)
 ; X86-NEXT:    retl
 ;