1 files changed, 76 insertions, 0 deletions
diff --git a/test/CodeGen/fp-contract-on-pragma.cpp b/test/CodeGen/fp-contract-on-pragma.cpp
new file mode 100644
index 0000000000000..812a7176b515c
--- /dev/null
+++ b/test/CodeGen/fp-contract-on-pragma.cpp
@@ -0,0 +1,76 @@
+// RUN: %clang_cc1 -O3 -triple %itanium_abi_triple -emit-llvm -o - %s | FileCheck %s
+
+// Is FP_CONTRACT honored in a simple case?
+float fp_contract_1(float a, float b, float c) {
+// CHECK: _Z13fp_contract_1fff
+// CHECK: tail call float @llvm.fmuladd
+#pragma clang fp contract(on)
+  return a * b + c;
+}
+
+// Is FP_CONTRACT state cleared on exiting compound statements?
+float fp_contract_2(float a, float b, float c) {
+  // CHECK: _Z13fp_contract_2fff
+  // CHECK: %[[M:.+]] = fmul float %a, %b
+  // CHECK-NEXT: fadd float %[[M]], %c
+  {
+#pragma clang fp contract(on)
+  }
+  return a * b + c;
+}
+
+// Does FP_CONTRACT survive template instantiation?
+class Foo {};
+Foo operator+(Foo, Foo);
+
+template <typename T>
+T template_muladd(T a, T b, T c) {
+#pragma clang fp contract(on)
+  return a * b + c;
+}
+
+float fp_contract_3(float a, float b, float c) {
+  // CHECK: _Z13fp_contract_3fff
+  // CHECK: tail call float @llvm.fmuladd
+  return template_muladd<float>(a, b, c);
+}
+
+template <typename T>
+class fp_contract_4 {
+  float method(float a, float b, float c) {
+#pragma clang fp contract(on)
+    return a * b + c;
+  }
+};
+
+template class fp_contract_4<int>;
+// CHECK: _ZN13fp_contract_4IiE6methodEfff
+// CHECK: tail call float @llvm.fmuladd
+
+// Check file-scoped FP_CONTRACT
+#pragma clang fp contract(on)
+float fp_contract_5(float a, float b, float c) {
+  // CHECK: _Z13fp_contract_5fff
+  // CHECK: tail call float @llvm.fmuladd
+  return a * b + c;
+}
+
+#pragma clang fp contract(off)
+float fp_contract_6(float a, float b, float c) {
+  // CHECK: _Z13fp_contract_6fff
+  // CHECK: %[[M:.+]] = fmul float %a, %b
+  // CHECK-NEXT: fadd float %[[M]], %c
+  return a * b + c;
+}
+
+// If the multiply has multiple uses, don't produce fmuladd.
+// This used to assert (PR25719):
+// https://llvm.org/bugs/show_bug.cgi?id=25719
+
+float fp_contract_7(float a, float b, float c) {
+// CHECK: _Z13fp_contract_7fff
+// CHECK:  %[[M:.+]] = fmul float %b, 2.000000e+00
+// CHECK-NEXT: fsub float %[[M]], %c
+#pragma clang fp contract(on)
+  return (a = 2 * b) - c;
+}