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