1 files changed, 66 insertions, 0 deletions
diff --git a/llvm/test/Transforms/LoopVectorize/pr30806-phi-scev.ll b/llvm/test/Transforms/LoopVectorize/pr30806-phi-scev.ll
new file mode 100644
index 00000000000..e04bdd6607d
--- /dev/null
+++ b/llvm/test/Transforms/LoopVectorize/pr30806-phi-scev.ll
@@ -0,0 +1,66 @@
+; RUN: opt -S -indvars < %s | FileCheck %s
+
+; Produced from the test-case:
+;
+; extern void foo(char *, unsigned , unsigned *);
+; extern void bar(int *, long);
+; extern char *processBuf(char *);
+;
+; extern unsigned theSize;
+;
+; void foo(char *buf, unsigned denominator, unsigned *flag) {
+;   int incr = (int) (theSize / denominator);
+;   int inx = 0;
+;   while (*flag) {
+;     int itmp = inx + incr;
+;     int i = (int) theSize;
+;     bar(&i, (long) itmp);
+;     buf = processBuf(buf);
+;     inx = itmp;
+;   }
+; }
+
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+
+@theSize = external local_unnamed_addr global i32, align 4
+
+define void @foo(i8* %buf, i32 %denominator, i32* %flag) local_unnamed_addr {
+entry:
+  %i = alloca i32, align 4
+  %0 = load i32, i32* @theSize, align 4
+  %div = udiv i32 %0, %denominator
+  %1 = load i32, i32* %flag, align 4
+  %tobool5 = icmp eq i32 %1, 0
+  br i1 %tobool5, label %while.end, label %while.body.lr.ph
+
+while.body.lr.ph:                                 ; preds = %entry
+  %2 = bitcast i32* %i to i8*
+  br label %while.body
+
+while.body:                                       ; preds = %while.body.lr.ph, %while.body
+; Check that there are two PHIs followed by a 'sext' in the same block, and that
+; the test does not crash.
+; CHECK:        phi
+; CHECK-NEXT:   phi
+; CHECK-NEXT:   sext
+  %buf.addr.07 = phi i8* [ %buf, %while.body.lr.ph ], [ %call, %while.body ]
+  %inx.06 = phi i32 [ 0, %while.body.lr.ph ], [ %add, %while.body ]
+  %add = add nsw i32 %inx.06, %div
+  %3 = load i32, i32* @theSize, align 4
+  store i32 %3, i32* %i, align 4
+  %conv = sext i32 %add to i64
+  call void @bar(i32* nonnull %i, i64 %conv)
+  %call = call i8* @processBuf(i8* %buf.addr.07)
+  %4 = load i32, i32* %flag, align 4
+  %tobool = icmp eq i32 %4, 0
+  br i1 %tobool, label %while.end.loopexit, label %while.body
+
+while.end.loopexit:                               ; preds = %while.body
+  br label %while.end
+
+while.end:                                        ; preds = %while.end.loopexit, %entry
+  ret void
+}
+
+declare void @bar(i32*, i64) local_unnamed_addr
+declare i8* @processBuf(i8*) local_unnamed_addr