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ba122ab42f
With this patch, by a constexpr function is implicitly host+device
unless:
a) it's a variadic function (variadic functions are not allowed on the
device side), or
b) it's preceeded by a __device__ overload in a system header.
The restriction on overloading __host__ __device__ functions on the
basis of their CUDA attributes remains in place, but we use (b) to allow
us to define __device__ overloads for constexpr functions in cmath,
which would otherwise be __host__ __device__ and thus not overloadable.
You can disable this behavior with -fno-cuda-host-device-constexpr.
Reviewers: tra, rnk, rsmith
Subscribers: cfe-commits
Differential Revision: http://reviews.llvm.org/D18380
llvm-svn: 264964
21 lines
673 B
Plaintext
21 lines
673 B
Plaintext
// RUN: %clang_cc1 -std=c++11 -fsyntax-only -fno-cuda-host-device-constexpr -verify %s
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// RUN: %clang_cc1 -std=c++11 -fsyntax-only -fno-cuda-host-device-constexpr -fcuda-is-device -verify %s
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#include "Inputs/cuda.h"
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// Check that, with -fno-cuda-host-device-constexpr, constexpr functions are
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// host-only, and __device__ constexpr functions are still device-only.
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constexpr int f() { return 0; } // expected-note {{not viable}}
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__device__ constexpr int g() { return 0; } // expected-note {{not viable}}
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void __device__ foo() {
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f(); // expected-error {{no matching function}}
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g();
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}
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void __host__ foo() {
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f();
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g(); // expected-error {{no matching function}}
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}
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