[Mlir-commits] [mlir] [mlir][NVVM] Set SpecialRangeableRegisterOp default int range to max (PR #174544)

[Longsheng Du]

https://github.com/LongshengDu created https://github.com/llvm/llvm-project/pull/174544

This PR added fix to ensure NVVM SpecialRangeableRegisterOp values default int range have correct semantic (max range i.e. unknown), rather than uninitialized. 

>From 42b330cb8b33c518a05c3bf5fdef1404dbf40862 Mon Sep 17 00:00:00 2001
From: Longsheng Du <longshengd at nvidia.com>
Date: Mon, 5 Jan 2026 23:53:07 -0800
Subject: [PATCH] add default max int range for nvvm ops

---
 mlir/lib/Dialect/LLVMIR/IR/NVVMDialect.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/mlir/lib/Dialect/LLVMIR/IR/NVVMDialect.cpp b/mlir/lib/Dialect/LLVMIR/IR/NVVMDialect.cpp
index 331d7a244310f..59f9acf140074 100644
--- a/mlir/lib/Dialect/LLVMIR/IR/NVVMDialect.cpp
+++ b/mlir/lib/Dialect/LLVMIR/IR/NVVMDialect.cpp
@@ -4544,6 +4544,8 @@ static void nvvmInferResultRanges(Operation *op, Value result,
   if (auto rangeAttr = op->getAttrOfType<LLVM::ConstantRangeAttr>("range")) {
     setResultRanges(result, {rangeAttr.getLower(), rangeAttr.getUpper(),
                              rangeAttr.getLower(), rangeAttr.getUpper()});
+  } else {
+    setResultRanges(result, IntegerValueRange::getMaxRange(result).getValue());
   }
 }