[SimplifyCFG] Add test for r229099

Add extra test that was accidentally not staged.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@229101 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Transforms/SimplifyCFG/clamp.ll b/test/Transforms/SimplifyCFG/clamp.ll
new file mode 100644 (file)
index 0000000..d21894a
--- /dev/null
+++ b/test/Transforms/SimplifyCFG/clamp.ll
@@ -0,0 +1,22 @@
+; RUN: opt < %s -simplifycfg -S | FileCheck %s
+
+define float @clamp(float %a, float %b, float %c) {
+; CHECK-LABEL: @clamp
+; CHECK:  %cmp = fcmp ogt float %a, %c
+; CHECK:  %cmp1 = fcmp olt float %a, %b
+; CHECK:  %cond = select i1 %cmp1, float %b, float %a
+; CHECK:  %cond5 = select i1 %cmp, float %c, float %cond
+; CHECK:  ret float %cond5
+entry:
+  %cmp = fcmp ogt float %a, %c
+  br i1 %cmp, label %cond.end4, label %cond.false
+
+cond.false:                                       ; preds = %entry
+  %cmp1 = fcmp olt float %a, %b
+  %cond = select i1 %cmp1, float %b, float %a
+  br label %cond.end4
+
+cond.end4:                                        ; preds = %entry, %cond.false
+  %cond5 = phi float [ %cond, %cond.false ], [ %c, %entry ]
+  ret float %cond5
+}