craig.topper created this revision.
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.
https://reviews.llvm.org/D36336
Files:
include/clang/Basic/BuiltinsX86.def
lib/CodeGen/CGBuiltin.cpp
test/CodeGen/builtin-cpu-supports.c
Index: test/CodeGen/builtin-cpu-supports.c
===================================================================
--- test/CodeGen/builtin-cpu-supports.c
+++ test/CodeGen/builtin-cpu-supports.c
@@ -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");
Index: lib/CodeGen/CGBuiltin.cpp
===================================================================
--- lib/CodeGen/CGBuiltin.cpp
+++ lib/CodeGen/CGBuiltin.cpp
@@ -7289,6 +7289,13 @@
Value *CodeGenFunction::EmitX86BuiltinExpr(unsigned BuiltinID,
const CallExpr *E) {
+ if (BuiltinID == 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);
+ }
+
SmallVector<Value*, 4> Ops;
// Find out if any arguments are required to be integer constant expressions.
Index: include/clang/Basic/BuiltinsX86.def
===================================================================
--- include/clang/Basic/BuiltinsX86.def
+++ include/clang/Basic/BuiltinsX86.def
@@ -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")
// Undefined Values
Index: test/CodeGen/builtin-cpu-supports.c
===================================================================
--- test/CodeGen/builtin-cpu-supports.c
+++ test/CodeGen/builtin-cpu-supports.c
@@ -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");
Index: lib/CodeGen/CGBuiltin.cpp
===================================================================
--- lib/CodeGen/CGBuiltin.cpp
+++ lib/CodeGen/CGBuiltin.cpp
@@ -7289,6 +7289,13 @@
Value *CodeGenFunction::EmitX86BuiltinExpr(unsigned BuiltinID,
const CallExpr *E) {
+ if (BuiltinID == 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);
+ }
+
SmallVector<Value*, 4> Ops;
// Find out if any arguments are required to be integer constant expressions.
Index: include/clang/Basic/BuiltinsX86.def
===================================================================
--- include/clang/Basic/BuiltinsX86.def
+++ include/clang/Basic/BuiltinsX86.def
@@ -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")
// Undefined Values
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