[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
llvm-svn: 311874
diff --git a/clang/lib/CodeGen/CGBuiltin.cpp b/clang/lib/CodeGen/CGBuiltin.cpp
index 585c27c..9ced44b 100644
--- a/clang/lib/CodeGen/CGBuiltin.cpp
+++ b/clang/lib/CodeGen/CGBuiltin.cpp
@@ -7404,9 +7404,6 @@
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 @@
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();