r311874 - [X86] Add support for __builtin_cpu_init
Craig Topper via cfe-commits
cfe-commits at lists.llvm.org
Sun Aug 27 22:43:23 PDT 2017
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");
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