Revert "Temporarily Revert "Add basic loop fusion pass.""
The reversion apparently deleted the test/Transforms directory.
Will be re-reverting again.
llvm-svn: 358552
diff --git a/llvm/test/Transforms/LoopVectorize/value-ptr-bug.ll b/llvm/test/Transforms/LoopVectorize/value-ptr-bug.ll
new file mode 100644
index 0000000..ce4601f
--- /dev/null
+++ b/llvm/test/Transforms/LoopVectorize/value-ptr-bug.ll
@@ -0,0 +1,50 @@
+; RUN: opt -S -loop-vectorize -force-vector-width=4 -force-vector-interleave=1 -dce -instcombine < %s | FileCheck %s
+
+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-S128"
+
+; PR16073
+
+; Because we were caching value pointers across a function call that could RAUW
+; we would generate an undefined value store below:
+; SCEVExpander::expandCodeFor would change a value (the start value of an
+; induction) that we cached in the induction variable list.
+
+; CHECK-LABEL: @test_vh(
+; CHECK-NOT: store <4 x i8> undef
+
+define void @test_vh(i32* %ptr265, i32* %ptr266, i32 %sub267) {
+entry:
+ br label %loop
+
+loop:
+ %inc = phi i32 [ %sub267, %entry ], [ %add, %loop]
+ %ext.inc = sext i32 %inc to i64
+ %add.ptr265 = getelementptr inbounds i32, i32* %ptr265, i64 %ext.inc
+ %add.ptr266 = getelementptr inbounds i32, i32* %ptr266, i64 %ext.inc
+ %add = add i32 %inc, 9
+ %cmp = icmp slt i32 %add, 140
+ br i1 %cmp, label %block1, label %loop
+
+block1:
+ %sub267.lcssa = phi i32 [ %add, %loop ]
+ %add.ptr266.lcssa = phi i32* [ %add.ptr266, %loop ]
+ %add.ptr265.lcssa = phi i32* [ %add.ptr265, %loop ]
+ %tmp29 = bitcast i32* %add.ptr265.lcssa to i8*
+ %tmp30 = bitcast i32* %add.ptr266.lcssa to i8*
+ br label %do.body272
+
+do.body272:
+ %row_width.5 = phi i32 [ %sub267.lcssa, %block1 ], [ %dec, %do.body272 ]
+ %sp.4 = phi i8* [ %tmp30, %block1 ], [ %incdec.ptr273, %do.body272 ]
+ %dp.addr.4 = phi i8* [ %tmp29, %block1 ], [ %incdec.ptr274, %do.body272 ]
+ %incdec.ptr273 = getelementptr inbounds i8, i8* %sp.4, i64 1
+ %tmp31 = load i8, i8* %sp.4, align 1
+ %incdec.ptr274 = getelementptr inbounds i8, i8* %dp.addr.4, i64 1
+ store i8 %tmp31, i8* %dp.addr.4, align 1
+ %dec = add i32 %row_width.5, -1
+ %cmp276 = icmp eq i32 %dec, 0
+ br i1 %cmp276, label %loop.exit, label %do.body272
+
+loop.exit:
+ ret void
+}