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911b200ce3
Implements GCC's constexpr string ASM extension https://gcc.gnu.org/onlinedocs/gcc/Asm-constexprs.html
53 lines
1.7 KiB
C++
53 lines
1.7 KiB
C++
// REQUIRES: x86-registered-target
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// RUN: %clang_cc1 -triple x86_64 %s -S -o /dev/null -Werror -verify
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// RUN: %clang_cc1 -triple x86_64-unknown-unknown -emit-llvm %s -o - | FileCheck %s
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struct string_view {
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int S;
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const char* D;
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constexpr string_view() : S(0), D(0){}
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constexpr string_view(const char* Str) : S(__builtin_strlen(Str)), D(Str) {}
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constexpr string_view(int Size, const char* Str) : S(Size), D(Str) {}
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constexpr int size() const {
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return S;
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}
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constexpr const char* data() const {
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return D;
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}
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};
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int func() {return 0;};
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void f() {
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asm((string_view("")) ::(string_view("r"))(func()));
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// CHECK: %[[CALL:.*]] = call noundef i32 @_Z4funcv
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// CHECK: call void asm sideeffect "", "r,~{dirflag},~{fpsr},~{flags}"
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asm("" :::(string_view("memory")));
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// CHECK: call void asm sideeffect "", "~{memory},~{dirflag},~{fpsr},~{flags}"
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}
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void foo(unsigned long long addr, unsigned long long a0) {
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register unsigned long long result asm("rax");
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register unsigned long long b0 asm("rdi");
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b0 = a0;
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asm((string_view("call *%1")) : (string_view("=r")) (result)
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: (string_view("r"))(addr), (string_view("r")) (b0) : (string_view("memory")));
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// CHECK:{{.*}} call i64 asm "call *$1", "={rax},r,{rdi},~{memory},~{dirflag},~{fpsr},~{flags}"
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}
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void test_srcloc() {
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asm((string_view( // expected-error {{invalid instruction mnemonic 'nonsense'}} \
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// expected-error {{invalid instruction mnemonic 'foobar'}} \
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// expected-note@1 {{instantiated into assembly here}} \
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// expected-note@2 {{instantiated into assembly here}}
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R"o(nonsense
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foobar)o")
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) ::(string_view("r"))(func()));
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}
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