From 72b819b8ee0a0a5e0389028b4637a48c668798a9 Mon Sep 17 00:00:00 2001
From: Reid Kleckner <rnk@google.com>
Date: Wed, 15 Nov 2017 18:51:12 +0000
Subject: [InstCombine] Salvage debug info during initial DCE

InstCombine salvages debug info for every instruction it erases from its
worklist, but it wasn't doing it during its initial DCE when populating
its worklist. This fixes that.

This should help improve availability of 'this' in optimized debug info
when casts are necessary.

llvm-svn: 318320
---
 llvm/lib/Transforms/InstCombine/InstructionCombining.cpp | 1 +
 1 file changed, 1 insertion(+)

(limited to 'llvm/lib/Transforms/InstCombine/InstructionCombining.cpp')

diff --git a/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp b/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp
index dad066a6fb4..f272f8273d1 100644
--- a/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp
@@ -3113,6 +3113,7 @@ static bool AddReachableCodeToWorklist(BasicBlock *BB, const DataLayout &DL,
       if (isInstructionTriviallyDead(Inst, TLI)) {
         ++NumDeadInst;
         DEBUG(dbgs() << "IC: DCE: " << *Inst << '\n');
+        salvageDebugInfo(*Inst);
         Inst->eraseFromParent();
         MadeIRChange = true;
         continue;
-- 
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