[llvm] [SDAG] Lower range attribute to AssertZext (PR #95450)

[Nikita Popov via llvm-commits]

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@@ -4487,6 +4487,18 @@ static const MDNode *getRangeMetadata(const Instruction &I) {
   return I.getMetadata(LLVMContext::MD_range);
 }
 
+static std::optional<ConstantRange> getRange(const Instruction &I) {
+  if (const auto *CB = dyn_cast<CallBase>(&I)) {
+    // see comment in getRangeMetadata about this check
+    if (CB->hasRetAttr(Attribute::NoUndef))
+      return CB->getRange();
+  }
+  if (const MDNode *Range = getRangeMetadata(I)) {
+    return getConstantRangeFromMetadata(*Range);
+  }
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nikic wrote:

Remove braces.

https://github.com/llvm/llvm-project/pull/95450