this testcase sent the dag combiner spinning into an infinite loop

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25418 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/CodeGen/Generic/2005-01-18-SetUO-InfLoop.ll b/test/CodeGen/Generic/2005-01-18-SetUO-InfLoop.ll
new file mode 100644 (file)
index 0000000..072841d
--- /dev/null
+++ b/test/CodeGen/Generic/2005-01-18-SetUO-InfLoop.ll
@@ -0,0 +1,19 @@
+; RUN: llvm-as < %s | llc
+
+void %intersect_pixel() {
+entry:
+       %tmp125 = call bool %llvm.isunordered.f64( double 0.000000e+00, double 0.000000e+00 )           ; <bool> [#uses=1]
+       %tmp126 = or bool %tmp125, false                ; <bool> [#uses=1]
+       %tmp126.not = xor bool %tmp126, true            ; <bool> [#uses=1]
+       %brmerge1 = or bool %tmp126.not, false          ; <bool> [#uses=1]
+       br bool %brmerge1, label %bb154, label %cond_false133
+
+cond_false133:         ; preds = %entry
+       ret void
+
+bb154:         ; preds = %entry
+       %tmp164 = seteq uint 0, 0               ; <bool> [#uses=0]
+       ret void
+}
+
+declare bool %llvm.isunordered.f64(double, double)