[llvm] [NVPTX] Basic support for fp128 as a storage type (PR #136006)

[Artem Belevich via llvm-commits]

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@@ -1682,31 +1673,39 @@ void NVPTXAsmPrinter::bufferLEByte(const Constant *CPV, int Bytes,
 void NVPTXAsmPrinter::bufferAggregateConstant(const Constant *CPV,
                                               AggBuffer *aggBuffer) {
   const DataLayout &DL = getDataLayout();
-  int Bytes;
 
-  // Integers of arbitrary width
-  if (const ConstantInt *CI = dyn_cast<ConstantInt>(CPV)) {
-    APInt Val = CI->getValue();
-    for (unsigned I = 0, E = DL.getTypeAllocSize(CPV->getType()); I < E; ++I) {
+  auto ExtendBuffer = [](APInt Val, AggBuffer *Buffer) {
+    for (unsigned _ : llvm::seq(Val.getBitWidth() / 8)) {
       uint8_t Byte = Val.getLoBits(8).getZExtValue();
-      aggBuffer->addBytes(&Byte, 1, 1);
+      Buffer->addBytes(&Byte, 1, 1);
       Val.lshrInPlace(8);
     }
+  };
+
+  // Integers of arbitrary width
+  if (const ConstantInt *CI = dyn_cast<ConstantInt>(CPV)) {
+    ExtendBuffer(CI->getValue(), aggBuffer);
     return;
   }
 
+  // f128
+  if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CPV)) {
+    if (CFP->getType()->isFP128Ty()) {
+      ExtendBuffer(CFP->getValueAPF().bitcastToAPInt(), aggBuffer);
+      return;
+    }
+  }
+
   // Old constants
   if (isa<ConstantArray>(CPV) || isa<ConstantVector>(CPV)) {
-    if (CPV->getNumOperands())
-      for (unsigned i = 0, e = CPV->getNumOperands(); i != e; ++i)
-        bufferLEByte(cast<Constant>(CPV->getOperand(i)), 0, aggBuffer);
+    for (const auto &Op : CPV->operands())
+      bufferLEByte(cast<Constant>(Op), 0, aggBuffer);
     return;
   }
 
-  if (const ConstantDataSequential *CDS =
-          dyn_cast<ConstantDataSequential>(CPV)) {
+  if (const auto *CDS = dyn_cast<ConstantDataSequential>(CPV)) {
     if (CDS->getNumElements())
-      for (unsigned i = 0; i < CDS->getNumElements(); ++i)
+      for (unsigned i : llvm::seq(CDS->getNumElements()))
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Artem-B wrote:

Style nit: variables should start with a capital. Applies here and elsewhere.

https://github.com/llvm/llvm-project/pull/136006