Author: ctopper Date: Sun Aug 27 22:43:23 2017 New Revision: 311874 URL: http://llvm.org/viewvc/llvm-project?rev=311874&view=rev Log: [X86] Add support for __builtin_cpu_init
This adds builtin_cpu_init which will emit a call to cpu_indicator_init in libgcc or compiler-rt. This is needed to support builtin_cpu_supports/builtin_cpu_is in an ifunc resolver. Differential Revision: https://reviews.llvm.org/D36336 Modified: cfe/trunk/include/clang/Basic/BuiltinsX86.def cfe/trunk/lib/CodeGen/CGBuiltin.cpp cfe/trunk/test/CodeGen/builtin-cpu-supports.c Modified: cfe/trunk/include/clang/Basic/BuiltinsX86.def URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/include/clang/Basic/BuiltinsX86.def?rev=311874&r1=311873&r2=311874&view=diff ============================================================================== --- cfe/trunk/include/clang/Basic/BuiltinsX86.def (original) +++ cfe/trunk/include/clang/Basic/BuiltinsX86.def Sun Aug 27 22:43:23 2017 @@ -32,6 +32,7 @@ // Miscellaneous builtin for checking x86 cpu features. // TODO: Make this somewhat generic so that other backends // can use it? +BUILTIN(__builtin_cpu_init, "v", "n") BUILTIN(__builtin_cpu_supports, "bcC*", "nc") BUILTIN(__builtin_cpu_is, "bcC*", "nc") Modified: cfe/trunk/lib/CodeGen/CGBuiltin.cpp URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/CodeGen/CGBuiltin.cpp?rev=311874&r1=311873&r2=311874&view=diff ============================================================================== --- cfe/trunk/lib/CodeGen/CGBuiltin.cpp (original) +++ cfe/trunk/lib/CodeGen/CGBuiltin.cpp Sun Aug 27 22:43:23 2017 @@ -7404,9 +7404,6 @@ static Value *EmitX86CpuIs(CodeGenFuncti Value *CodeGenFunction::EmitX86BuiltinExpr(unsigned BuiltinID, const CallExpr *E) { - if (BuiltinID == X86::BI__builtin_cpu_is) - return EmitX86CpuIs(*this, E); - SmallVector<Value*, 4> Ops; // Find out if any arguments are required to be integer constant expressions. @@ -7457,6 +7454,15 @@ Value *CodeGenFunction::EmitX86BuiltinEx switch (BuiltinID) { default: return nullptr; + case X86::BI__builtin_cpu_init: { + llvm::FunctionType *FTy = llvm::FunctionType::get(VoidTy, + /*Variadic*/false); + llvm::Constant *Func = CGM.CreateRuntimeFunction(FTy, + "__cpu_indicator_init"); + return Builder.CreateCall(Func); + } + case X86::BI__builtin_cpu_is: + return EmitX86CpuIs(*this, E); case X86::BI__builtin_cpu_supports: { const Expr *FeatureExpr = E->getArg(0)->IgnoreParenCasts(); StringRef FeatureStr = cast<StringLiteral>(FeatureExpr)->getString(); Modified: cfe/trunk/test/CodeGen/builtin-cpu-supports.c URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CodeGen/builtin-cpu-supports.c?rev=311874&r1=311873&r2=311874&view=diff ============================================================================== --- cfe/trunk/test/CodeGen/builtin-cpu-supports.c (original) +++ cfe/trunk/test/CodeGen/builtin-cpu-supports.c Sun Aug 27 22:43:23 2017 @@ -5,6 +5,10 @@ extern void a(const char *); int main() { + __builtin_cpu_init(); + + // CHECK: call void @__cpu_indicator_init + if (__builtin_cpu_supports("sse4.2")) a("sse4.2"); _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
