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MS extension: Make __noop be the integer zero, not void 

We still don't accept '__noop;', and we don't consider __noop to be the
integer literal zero.  More work is needed.

llvm-svn: 212839
This commit is contained in:
Reid Kleckner 2014-07-11 20:22:55 +00:00
parent 10cd0f457a
commit ed5d4adb36
3 changed files with 6 additions and 5 deletions
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2
clang/include/clang/Basic/Builtins.def
View File

@ -679,7 +679,7 @@ BUILTIN(__builtin_rindex, "c*cC*i", "Fn")
// Microsoft builtins. These are only active with -fms-extensions. // Microsoft builtins. These are only active with -fms-extensions.
LANGBUILTIN(_alloca, "v*z", "n", ALL_MS_LANGUAGES) LANGBUILTIN(_alloca, "v*z", "n", ALL_MS_LANGUAGES)
LANGBUILTIN(__assume, "vb", "n", ALL_MS_LANGUAGES) LANGBUILTIN(__assume, "vb", "n", ALL_MS_LANGUAGES)
LANGBUILTIN(__noop, "v.", "n", ALL_MS_LANGUAGES) LANGBUILTIN(__noop, "i.", "n", ALL_MS_LANGUAGES)
LANGBUILTIN(__debugbreak, "v", "n", ALL_MS_LANGUAGES) LANGBUILTIN(__debugbreak, "v", "n", ALL_MS_LANGUAGES)
LANGBUILTIN(__va_start, "vc**.", "nt", ALL_MS_LANGUAGES) LANGBUILTIN(__va_start, "vc**.", "nt", ALL_MS_LANGUAGES)
LANGBUILTIN(_InterlockedCompareExchange, "LiLiD*LiLi", "n", ALL_MS_LANGUAGES) LANGBUILTIN(_InterlockedCompareExchange, "LiLiD*LiLi", "n", ALL_MS_LANGUAGES)

3
clang/lib/CodeGen/CGBuiltin.cpp
View File

@ -1515,7 +1515,8 @@ RValue CodeGenFunction::EmitBuiltinExpr(const FunctionDecl *FD,
return EmitBuiltinNewDeleteCall(FD->getType()->castAs<FunctionProtoType>(), return EmitBuiltinNewDeleteCall(FD->getType()->castAs<FunctionProtoType>(),
E->getArg(0), true); E->getArg(0), true);
case Builtin::BI__noop: case Builtin::BI__noop:
return RValue::get(nullptr); // __noop always evaluates to an integer literal zero.
return RValue::get(ConstantInt::get(IntTy, 0));
case Builtin::BI_InterlockedExchange: case Builtin::BI_InterlockedExchange:
case Builtin::BI_InterlockedExchangePointer: case Builtin::BI_InterlockedExchangePointer:
return EmitBinaryAtomic(*this, llvm::AtomicRMWInst::Xchg, E); return EmitBinaryAtomic(*this, llvm::AtomicRMWInst::Xchg, E);

6
clang/test/CodeGen/builtin-ms-noop.cpp
View File

@ -5,9 +5,9 @@ class A {
~A() {} ~A() {}
}; };
void f() { int f() {
// CHECK: @_Z1fv // CHECK: @_Z1fv
// CHECK-NOT: call void @_ZN1AD1Ev // CHECK-NOT: call void @_ZN1AD1Ev
// CHECK: ret void // CHECK: ret i32 0
__noop(A()); return __noop(A());
}; };