New testcase that crashes the pattern isel

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21800 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/CodeGen/X86/2005-05-08-FPStackifierPHI.ll b/test/CodeGen/X86/2005-05-08-FPStackifierPHI.ll
new file mode 100644 (file)
index 0000000..b22a7d0
--- /dev/null
+++ b/test/CodeGen/X86/2005-05-08-FPStackifierPHI.ll
@@ -0,0 +1,49 @@
+; RUN: llvm-as < %s | llc -march=x86
+; Make sure LLC doesn't crash in the stackifier due to FP PHI nodes.
+
+void %radfg_() {
+entry:
+       br bool false, label %no_exit.16.preheader, label %loopentry.0
+
+loopentry.0:           ; preds = %entry
+       ret void
+
+no_exit.16.preheader:          ; preds = %entry
+       br label %no_exit.16
+
+no_exit.16:            ; preds = %no_exit.16, %no_exit.16.preheader
+       br bool false, label %loopexit.16.loopexit, label %no_exit.16
+
+loopexit.16.loopexit:          ; preds = %no_exit.16
+       br label %no_exit.18
+
+no_exit.18:            ; preds = %loopexit.20, %loopexit.16.loopexit
+       %tmp.882 = add float 0.000000e+00, 0.000000e+00         ; <float> [#uses=2]
+       br bool false, label %loopexit.19, label %no_exit.19.preheader
+
+no_exit.19.preheader:          ; preds = %no_exit.18
+       ret void
+
+loopexit.19:           ; preds = %no_exit.18
+       br bool false, label %loopexit.20, label %no_exit.20
+
+no_exit.20:            ; preds = %loopexit.21, %loopexit.19
+       %ai2.1122.tmp.3 = phi float [ %tmp.958, %loopexit.21 ], [ %tmp.882, %loopexit.19 ]              ; <float> [#uses=1]
+       %tmp.950 = mul float %tmp.882, %ai2.1122.tmp.3          ; <float> [#uses=1]
+       %tmp.951 = sub float 0.000000e+00, %tmp.950             ; <float> [#uses=1]
+       %tmp.958 = add float 0.000000e+00, 0.000000e+00         ; <float> [#uses=1]
+       br bool false, label %loopexit.21, label %no_exit.21.preheader
+
+no_exit.21.preheader:          ; preds = %no_exit.20
+       ret void
+
+loopexit.21:           ; preds = %no_exit.20
+       br bool false, label %loopexit.20, label %no_exit.20
+
+loopexit.20:           ; preds = %loopexit.21, %loopexit.19
+       %ar2.1124.tmp.2 = phi float [ 0.000000e+00, %loopexit.19 ], [ %tmp.951, %loopexit.21 ]          ; <float> [#uses=0]
+       br bool false, label %loopexit.18.loopexit, label %no_exit.18
+
+loopexit.18.loopexit:          ; preds = %loopexit.20
+       ret void
+}