9f2351c27e
Summary: From the Language reference: > By default, global initializers are optimized by assuming that global variables defined within the module are not modified from their initial values before the start of the global initializer. This is true even for variables potentially accessible from outside the module, including those with external linkage or appearing in @llvm.used or dllexported variables. This assumption may be suppressed by marking the variable with externally_initialized. This is intended because device programs can be modified beyond the normal lifetime expected by the optimization pipeline. However, for constant variables we should be able to safely assume that these are truly constant within the module. In the vast majority of cases these will not get externally visible symbols, but even `extern const` uses we should assert that the user should not be writing them if they are marked const.
44 lines
1.4 KiB
Plaintext
44 lines
1.4 KiB
Plaintext
// RUN: %clang_cc1 -std=c++14 %s -emit-llvm -o - -triple nvptx \
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// RUN: -fcuda-is-device | FileCheck --check-prefixes=CXX14 %s
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// RUN: %clang_cc1 -std=c++17 %s -emit-llvm -o - -triple nvptx \
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// RUN: -fcuda-is-device | FileCheck --check-prefixes=CXX17 %s
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#include "Inputs/cuda.h"
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// COM: @_ZL1a = internal {{.*}}constant i32 7
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constexpr int a = 7;
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__constant__ const int &use_a = a;
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namespace B {
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// COM: @_ZN1BL1bE = internal {{.*}}constant i32 9
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constexpr int b = 9;
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}
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__constant__ const int &use_B_b = B::b;
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struct Q {
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// CXX14: @_ZN1Q2k2E = {{.*}}constant i32 6
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// CXX17: @_ZN1Q2k2E = internal {{.*}}constant i32 6
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// CXX14: @_ZN1Q2k1E = available_externally {{.*}}constant i32 5
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// CXX17: @_ZN1Q2k1E = {{.*}} constant i32 5
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static constexpr int k1 = 5;
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static constexpr int k2 = 6;
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};
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constexpr int Q::k2;
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__constant__ const int &use_Q_k1 = Q::k1;
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__constant__ const int &use_Q_k2 = Q::k2;
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template<typename T> struct X {
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// CXX14: @_ZN1XIiE1aE = available_externally {{.*}}constant i32 123
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// CXX17: @_ZN1XIiE1aE = {{.*}}constant i32 123
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static constexpr int a = 123;
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};
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__constant__ const int &use_X_a = X<int>::a;
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template <typename T, T a, T b> struct A {
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// CXX14: @_ZN1AIiLi1ELi2EE1xE = available_externally {{.*}}constant i32 2
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// CXX17: @_ZN1AIiLi1ELi2EE1xE = {{.*}}constant i32 2
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constexpr static T x = a * b;
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};
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__constant__ const int &y = A<int, 1, 2>::x;
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