From 1176aa52646fe641a4243a246aa7f960c708a274 Mon Sep 17 00:00:00 2001
From: dim <dim@FreeBSD.org>
Date: Sun, 17 Jul 2011 15:36:56 +0000
Subject: Vendor import of llvm trunk r135360:
 http://llvm.org/svn/llvm-project/llvm/trunk@135360

---
 lib/Transforms/InstCombine/InstructionCombining.cpp | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

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

diff --git a/lib/Transforms/InstCombine/InstructionCombining.cpp b/lib/Transforms/InstCombine/InstructionCombining.cpp
index 92c10f5..ab98ef9 100644
--- a/lib/Transforms/InstCombine/InstructionCombining.cpp
+++ b/lib/Transforms/InstCombine/InstructionCombining.cpp
@@ -785,6 +785,14 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
   // getelementptr instructions into a single instruction.
   //
   if (GEPOperator *Src = dyn_cast<GEPOperator>(PtrOp)) {
+
+    // If this GEP has only 0 indices, it is the same pointer as
+    // Src. If Src is not a trivial GEP too, don't combine
+    // the indices.
+    if (GEP.hasAllZeroIndices() && !Src->hasAllZeroIndices() &&
+        !Src->hasOneUse())
+      return 0;
+
     // Note that if our source is a gep chain itself that we wait for that
     // chain to be resolved before we perform this transformation.  This
     // avoids us creating a TON of code in some cases.
@@ -1191,7 +1199,7 @@ Instruction *InstCombiner::visitExtractValueInst(ExtractValueInst &EV) {
       if (EV.getNumIndices() > 1)
         // Extract the remaining indices out of the constant indexed by the
         // first index
-        return ExtractValueInst::Create(V, EV.idx_begin() + 1, EV.idx_end());
+        return ExtractValueInst::Create(V, EV.getIndices().slice(1));
       else
         return ReplaceInstUsesWith(EV, V);
     }
@@ -1214,7 +1222,7 @@ Instruction *InstCombiner::visitExtractValueInst(ExtractValueInst &EV) {
         // with
         // %E = extractvalue { i32, { i32 } } %A, 0
         return ExtractValueInst::Create(IV->getAggregateOperand(),
-                                        EV.idx_begin(), EV.idx_end());
+                                        EV.getIndices());
     }
     if (exti == exte && insi == inse)
       // Both iterators are at the end: Index lists are identical. Replace
@@ -1232,9 +1240,9 @@ Instruction *InstCombiner::visitExtractValueInst(ExtractValueInst &EV) {
       // by switching the order of the insert and extract (though the
       // insertvalue should be left in, since it may have other uses).
       Value *NewEV = Builder->CreateExtractValue(IV->getAggregateOperand(),
-                                                 EV.idx_begin(), EV.idx_end());
+                                                 EV.getIndices());
       return InsertValueInst::Create(NewEV, IV->getInsertedValueOperand(),
-                                     insi, inse);
+                                     ArrayRef<unsigned>(insi, inse));
     }
     if (insi == inse)
       // The insert list is a prefix of the extract list
@@ -1246,7 +1254,7 @@ Instruction *InstCombiner::visitExtractValueInst(ExtractValueInst &EV) {
       // with
       // %E extractvalue { i32 } { i32 42 }, 0
       return ExtractValueInst::Create(IV->getInsertedValueOperand(), 
-                                      exti, exte);
+                                      ArrayRef<unsigned>(exti, exte));
   }
   if (IntrinsicInst *II = dyn_cast<IntrinsicInst>(Agg)) {
     // We're extracting from an intrinsic, see if we're the only user, which
-- 
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