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?
fp_contract_1(float a,float b,float c)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?
fp_contract_2(float a,float b,float c)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>
template_muladd(T a,T b,T c)27 T template_muladd(T a, T b, T c) {
28 #pragma clang fp contract(on)
29 return a * b + c;
30 }
31
fp_contract_3(float a,float b,float c)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 {
method(float a,float b,float c)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)
fp_contract_5(float a,float b,float c)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)
fp_contract_6(float a,float b,float c)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
fp_contract_7(float a,float b,float c)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