clang/test/CodeGen/fp-contract-fast-pragma.cpp

   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: %[[M:.+]] = fmul contract float %a, %b
   7 // CHECK-NEXT: fadd contract float %[[M]], %c
   8 #pragma clang fp contract(fast)
   9   return a * b + c;
  10 }
  11
  12 // Is FP_CONTRACT state cleared on exiting compound statements?
  13 float fp_contract_2(float a, float b, float c) {
  14   // CHECK: _Z13fp_contract_2fff
  15   // CHECK: %[[M:.+]] = fmul float %a, %b
  16   // CHECK-NEXT: fadd float %[[M]], %c
  17   {
  18 #pragma clang fp contract(fast)
  19   }
  20   return a * b + c;
  21 }
  22
  23 // Does FP_CONTRACT survive template instantiation?
  24 class Foo {};
  25 Foo operator+(Foo, Foo);
  26
  27 template <typename T>
  28 T template_muladd(T a, T b, T c) {
  29 #pragma clang fp contract(fast)
  30   return a * b + c;
  31 }
  32
  33 float fp_contract_3(float a, float b, float c) {
  34   // CHECK: _Z13fp_contract_3fff
  35   // CHECK: %[[M:.+]] = fmul contract float %a, %b
  36   // CHECK-NEXT: fadd contract float %[[M]], %c
  37   return template_muladd<float>(a, b, c);
  38 }
  39
  40 template <typename T>
  41 class fp_contract_4 {
  42   float method(float a, float b, float c) {
  43 #pragma clang fp contract(fast)
  44     return a * b + c;
  45   }
  46 };
  47
  48 template class fp_contract_4<int>;
  49 // CHECK: _ZN13fp_contract_4IiE6methodEfff
  50 // CHECK: %[[M:.+]] = fmul contract float %a, %b
  51 // CHECK-NEXT: fadd contract float %[[M]], %c
  52
  53 // Check file-scoped FP_CONTRACT
  54 #pragma clang fp contract(fast)
  55 float fp_contract_5(float a, float b, float c) {
  56   // CHECK: _Z13fp_contract_5fff
  57   // CHECK: %[[M:.+]] = fmul contract float %a, %b
  58   // CHECK-NEXT: fadd contract float %[[M]], %c
  59   return a * b + c;
  60 }
  61
  62 // Verify that we can handle multiple flags on the same pragma
  63 #pragma clang fp contract(fast) contract(off)
  64 float fp_contract_6(float a, float b, float c) {
  65   // CHECK: _Z13fp_contract_6fff
  66   // CHECK: %[[M:.+]] = fmul float %a, %b
  67   // CHECK-NEXT: fadd float %[[M]], %c
  68   return a * b + c;
  69 }