1 files changed, 20 insertions, 0 deletions
diff --git a/test/Transforms/InstCombine/constant-fold-libfunc.ll b/test/Transforms/InstCombine/constant-fold-libfunc.ll
new file mode 100644
index 000000000000..c969b65a4e74
--- /dev/null
+++ b/test/Transforms/InstCombine/constant-fold-libfunc.ll
@@ -0,0 +1,20 @@
+; RUN: opt < %s -instcombine -S | FileCheck %s
+
+declare double @acos(double)
+
+; Check that functions without any function attributes are simplified.
+
+define double @test_simplify_acos() {
+; CHECK-LABEL: @test_simplify_acos
+  %pi = call double @acos(double -1.000000e+00)
+; CHECK-NOT: call double @acos
+; CHECK: ret double 0x400921FB54442D18
+  ret double %pi
+}
+
+define double @test_acos_nobuiltin() {
+; CHECK-LABEL: @test_acos_nobuiltin
+  %pi = call double @acos(double -1.000000e+00) nobuiltin 
+; CHECK: call double @acos(double -1.000000e+00)
+  ret double %pi
+}