[llvm] [SPIRV] Fix trunc nonstandard int types (PR #191393)

[via llvm-commits]

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@@ -397,25 +397,40 @@ static unsigned widenBitWidthToNextPow2(unsigned BitWidth) {
   return std::min(std::max(1u << Log2_32_Ceil(BitWidth), 8u), 128u);
 }
 
-static void widenScalarType(Register Reg, MachineRegisterInfo &MRI) {
+static unsigned widenScalarType(Register Reg, MachineRegisterInfo &MRI) {
+  // Returns original size or 0 if no change.
   LLT RegType = MRI.getType(Reg);
   if (!RegType.isScalar())
-    return;
+    return 0;
   unsigned CurrentWidth = RegType.getScalarSizeInBits();
   unsigned NewWidth = widenBitWidthToNextPow2(CurrentWidth);
-  if (NewWidth != CurrentWidth)
+  if (NewWidth != CurrentWidth) {
     MRI.setType(Reg, LLT::scalar(NewWidth));
+    return CurrentWidth;
+  }
+  return 0;
 }
 
-static void widenCImmType(MachineOperand &MOP) {
+static unsigned widenCImmType(MachineOperand &MOP) {
+  // Returns original size or 0 if no change.
   const ConstantInt *CImmVal = MOP.getCImm();
   unsigned CurrentWidth = CImmVal->getBitWidth();
   unsigned NewWidth = widenBitWidthToNextPow2(CurrentWidth);
-  if (NewWidth != CurrentWidth) {
-    // Replace the immediate value with the widened version
-    MOP.setCImm(ConstantInt::get(CImmVal->getType()->getContext(),
-                                 CImmVal->getValue().zextOrTrunc(NewWidth)));
-  }
+  if (NewWidth == CurrentWidth)
+    return 0;
+
+  // Replace the immediate value with the widened version.
+  MOP.setCImm(ConstantInt::get(CImmVal->getType()->getContext(),
+                               CImmVal->getValue().zextOrTrunc(NewWidth)));
+  return CurrentWidth;
+}
+
+static unsigned widenOperand(MachineOperand &MOP, MachineRegisterInfo &MRI) {
+  // Returns original size or 0 if no change.
+  if (MOP.isReg())
+    return widenScalarType(MOP.getReg(), MRI);
+  else if (MOP.isCImm())
+    return widenCImmType(MOP);
 }
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idubinov wrote:

not related anymore

https://github.com/llvm/llvm-project/pull/191393