suppresses unused variable warning

[cjdb]

No description provided.

[llvmbot]

@llvm/pr-subscribers-debuginfo

Author: Christopher Di Bella (cjdb)

Changes

---

Full diff: https://github.com/llvm/llvm-project/pull/99526.diff

1 Files Affected:

• (modified) llvm/lib/CodeGen/LiveDebugValues/InstrRefBasedImpl.cpp (+1)

diff --git a/llvm/lib/CodeGen/LiveDebugValues/InstrRefBasedImpl.cpp b/llvm/lib/CodeGen/LiveDebugValues/InstrRefBasedImpl.cpp
index b9cf36a07846c..3d90c0a2c0de3 100644
--- a/llvm/lib/CodeGen/LiveDebugValues/InstrRefBasedImpl.cpp
+++ b/llvm/lib/CodeGen/LiveDebugValues/InstrRefBasedImpl.cpp
@@ -3362,6 +3362,7 @@ void InstrRefBasedLDV::buildVLocValueMap(
       if (BlockLiveIn->Kind == DbgValue::VPHI)
         BlockLiveIn->Kind = DbgValue::Def;
       auto &[Var, DILoc] = DVMap.lookupDVID(VarID);
+      (void)DILoc;
       assert(BlockLiveIn->Properties.DIExpr->getFragmentInfo() ==
                  Var.getFragment() &&
              "Fragment info missing during value prop");

[dwblaikie]

FWIW/next time, I'd consider rolling this into the assert, maybe?

      assert(BlockLiveIn->Properties.DIExpr->getFragmentInfo() ==
                 DVMap.lookupDVID(VarID).first.getFragment() &&
               ...

(so the optimizer doesn't have to deal with the lookup code in nonasserts builds)
(and/or if the named variable helped with readability/was needed for other reasons, maybe using auto &VarID = ...(VarID).first; ? rather than needing to name an extra fully unused variable (DILoc))

[jmorse]

(Thanks for catching this for me!)