[LoopUnrollAnalyzer] Fix a crash in analyzeLoopUnrollCost.
Condition might be simplified to a Constant, but it doesn't have to be
ConstantInt, so we should dyn_cast, instead of cast.
This fixes PR27886.
llvm-svn: 270924
diff --git a/llvm/test/Transforms/LoopUnroll/full-unroll-crashers.ll b/llvm/test/Transforms/LoopUnroll/full-unroll-crashers.ll
index 54d4bbb..00d12c2 100644
--- a/llvm/test/Transforms/LoopUnroll/full-unroll-crashers.ll
+++ b/llvm/test/Transforms/LoopUnroll/full-unroll-crashers.ll
@@ -137,3 +137,33 @@
exit:
ret void
}
+
+@i = external global i32, align 4
+
+define void @folded_not_to_constantint() {
+entry:
+ br label %for.body
+
+for.body:
+ %iv = phi i32 [ 0, %entry ], [ %inc, %for.inc ]
+ %m = phi i32* [ @i, %entry ], [ %m, %for.inc ]
+ br i1 undef, label %if.else, label %if.then
+
+if.then:
+ unreachable
+
+if.else:
+ %cmp = icmp ult i32* %m, null
+ br i1 %cmp, label %cond.false, label %for.inc
+
+cond.false:
+ unreachable
+
+for.inc:
+ %inc = add nuw nsw i32 %iv, 1
+ %cmp2 = icmp ult i32 %inc, 10
+ br i1 %cmp2, label %for.body, label %for.end
+
+for.end:
+ ret void
+}