1 // RUN: %clang_cc1 -O3 -triple %itanium_abi_triple -emit-llvm -o - %s | FileCheck %s
2 
3 // Is FP_CONTRACT honored in a simple case?
4 float fp_contract_1(float a, float b, float c) {
5 // CHECK: _Z13fp_contract_1fff
6 // CHECK: tail call float @llvm.fmuladd
7 #pragma clang fp contract(on)
8   return a * b + c;
9 }
10 
11 // Is FP_CONTRACT state cleared on exiting compound statements?
12 float fp_contract_2(float a, float b, float c) {
13   // CHECK: _Z13fp_contract_2fff
14   // CHECK: %[[M:.+]] = fmul float %a, %b
15   // CHECK-NEXT: fadd float %[[M]], %c
16   {
17 #pragma clang fp contract(on)
18   }
19   return a * b + c;
20 }
21 
22 // Does FP_CONTRACT survive template instantiation?
23 class Foo {};
24 Foo operator+(Foo, Foo);
25 
26 template <typename T>
27 T template_muladd(T a, T b, T c) {
28 #pragma clang fp contract(on)
29   return a * b + c;
30 }
31 
32 float fp_contract_3(float a, float b, float c) {
33   // CHECK: _Z13fp_contract_3fff
34   // CHECK: tail call float @llvm.fmuladd
35   return template_muladd<float>(a, b, c);
36 }
37 
38 template <typename T>
39 class fp_contract_4 {
40   float method(float a, float b, float c) {
41 #pragma clang fp contract(on)
42     return a * b + c;
43   }
44 };
45 
46 template class fp_contract_4<int>;
47 // CHECK: _ZN13fp_contract_4IiE6methodEfff
48 // CHECK: tail call float @llvm.fmuladd
49 
50 // Check file-scoped FP_CONTRACT
51 #pragma clang fp contract(on)
52 float fp_contract_5(float a, float b, float c) {
53   // CHECK: _Z13fp_contract_5fff
54   // CHECK: tail call float @llvm.fmuladd
55   return a * b + c;
56 }
57 
58 #pragma clang fp contract(off)
59 float fp_contract_6(float a, float b, float c) {
60   // CHECK: _Z13fp_contract_6fff
61   // CHECK: %[[M:.+]] = fmul float %a, %b
62   // CHECK-NEXT: fadd float %[[M]], %c
63   return a * b + c;
64 }
65 
66 // If the multiply has multiple uses, don't produce fmuladd.
67 // This used to assert (PR25719):
68 // https://llvm.org/bugs/show_bug.cgi?id=25719
69 
70 float fp_contract_7(float a, float b, float c) {
71 // CHECK: _Z13fp_contract_7fff
72 // CHECK:  %[[M:.+]] = fmul float %b, 2.000000e+00
73 // CHECK-NEXT: fsub float %[[M]], %c
74 #pragma clang fp contract(on)
75   return (a = 2 * b) - c;
76 }
77