disable value insertion for now, I need to figure out how

to inform GVN about the newly inserted values.  This fixes 
PR5631.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90022 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/Scalar/GVN.cpp

@@ -1437,10 +1437,16 @@ bool GVN::processNonLocalLoad(LoadInst *LI,
   //
   // FIXME: This may insert a computation, but we don't tell scalar GVN
   // optimization stuff about it.  How do we do this?
+#if 0
   Value *LoadPtr =
     MD->InsertPHITranslatedPointer(LI->getOperand(0), LoadBB,
                                    UnavailablePred, TD, *DT);
-
+#else
+  Value *LoadPtr =
+    MD->GetAvailablePHITranslatedValue(LI->getOperand(0), LoadBB,
+                                       UnavailablePred, TD, *DT);
+#endif  
+  
   // If we couldn't find or insert a computation of this phi translated value,
   // we fail PRE.
   if (LoadPtr == 0) {

test/Transforms/GVN/crash.ll

@@ -0,0 +1,61 @@
+; RUN: opt -gvn %s -disable-output
+
+; PR5631
+
+target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
+target triple = "x86_64-apple-darwin10.0"
+
+define i32* @peel_to_type(i8* %name, i32 %namelen, i32* %o, i32 %expected_type) nounwind ssp {
+entry:
+  br i1 undef, label %if.end13, label %while.body.preheader
+
+
+if.end13:                                         ; preds = %if.then6
+  br label %while.body.preheader
+
+while.body.preheader:                             ; preds = %if.end13, %if.end
+  br label %while.body
+
+while.body:                                       ; preds = %while.body.backedge, %while.body.preheader
+  %o.addr.0 = phi i32* [ undef, %while.body.preheader ], [ %o.addr.0.be, %while.body.backedge ] ; <i32*> [#uses=2]
+  br i1 false, label %return.loopexit, label %lor.lhs.false
+
+lor.lhs.false:                                    ; preds = %while.body
+  %tmp20 = bitcast i32* %o.addr.0 to i32*         ; <i32*> [#uses=1]
+  %tmp22 = load i32* %tmp20                       ; <i32> [#uses=0]
+  br i1 undef, label %land.lhs.true24, label %if.end31
+
+land.lhs.true24:                                  ; preds = %lor.lhs.false
+  %call28 = call i32* @parse_object(i8* undef) nounwind ; <i32*> [#uses=0]
+  br i1 undef, label %return.loopexit, label %if.end31
+
+if.end31:                                         ; preds = %land.lhs.true24, %lor.lhs.false
+  br i1 undef, label %return.loopexit, label %if.end41
+
+if.end41:                                         ; preds = %if.end31
+  %tmp43 = bitcast i32* %o.addr.0 to i32*         ; <i32*> [#uses=1]
+  %tmp45 = load i32* %tmp43                       ; <i32> [#uses=0]
+  br i1 undef, label %if.then50, label %if.else
+
+if.then50:                                        ; preds = %if.end41
+  %tmp53 = load i32** undef                       ; <i32*> [#uses=1]
+  br label %while.body.backedge
+
+if.else:                                          ; preds = %if.end41
+  br i1 undef, label %if.then62, label %if.else67
+
+if.then62:                                        ; preds = %if.else
+  br label %while.body.backedge
+
+while.body.backedge:                              ; preds = %if.then62, %if.then50
+  %o.addr.0.be = phi i32* [ %tmp53, %if.then50 ], [ undef, %if.then62 ] ; <i32*> [#uses=1]
+  br label %while.body
+
+if.else67:                                        ; preds = %if.else
+  ret i32* null
+
+return.loopexit:                                  ; preds = %if.end31, %land.lhs.true24, %while.body
+  ret i32* undef
+}
+
+declare i32* @parse_object(i8*)

test/Transforms/GVN/pre-load.ll

@@ -86,9 +86,9 @@ block1:
 
 block2:
  br label %block4
-; CHECK: block2:
-; CHECK:   load i32*
-; CHECK:   br label %block4
+; HECK: block2:
+; HECK:   load i32*
+; HECK:   br label %block4
 
 block3:
   %B = getelementptr i32* %q, i32 1
@@ -103,10 +103,10 @@ block4:
   %P3 = getelementptr i32* %P2, i32 1
   %PRE = load i32* %P3
   ret i32 %PRE
-; CHECK: block4:
-; CHECK-NEXT: phi i32 [
-; CHECK-NOT: load
-; CHECK: ret i32
+; HECK: block4:
+; HECK-NEXT: phi i32 [
+; HECK-NOT: load
+; HECK: ret i32
 }
 
 ;void test5(int N, double *G) {
@@ -239,12 +239,10 @@ return:
   ret void
 }
 
-
-;;; --- todo
-
-;; Here the loaded address isn't available in 'block2' at all.
-define i32 @testX(i32* %p, i32* %q, i32** %Hack, i1 %C) {
-; CHECK: @testX
+;; Here the loaded address isn't available in 'block2' at all, requiring a new
+;; GEP to be inserted into it.
+define i32 @test8(i32* %p, i32* %q, i32** %Hack, i1 %C) {
+; CHECK: @test8
 block1:
 	br i1 %C, label %block2, label %block3