[PATCH] Implement MSVC __cpuid intrinsic.

[Craig Topper]

What about __cpuidex?


On Wed, Apr 17, 2013 at 11:40 PM, Peter Collingbourne <peter at pcc.me.uk>wrote:

> Hi rnk,
>
> http://llvm-reviews.chandlerc.com/D686
>
> Files:
>   include/clang/Basic/Builtins.def
>   lib/CodeGen/CGBuiltin.cpp
>   test/CodeGen/builtin-ms-cpuid.c
>
> Index: include/clang/Basic/Builtins.def
> ===================================================================
> --- include/clang/Basic/Builtins.def
> +++ include/clang/Basic/Builtins.def
> @@ -668,6 +668,7 @@
>
>  // Microsoft builtins.
>  BUILTIN(__assume, "vb", "n")
> +BUILTIN(__cpuid, "vi*i", "n")
>  BUILTIN(__noop, "v.", "n")
>  BUILTIN(__debugbreak, "v", "n")
>
> Index: lib/CodeGen/CGBuiltin.cpp
> ===================================================================
> --- lib/CodeGen/CGBuiltin.cpp
> +++ lib/CodeGen/CGBuiltin.cpp
> @@ -20,6 +20,7 @@
>  #include "clang/Basic/TargetBuiltins.h"
>  #include "clang/Basic/TargetInfo.h"
>  #include "llvm/IR/DataLayout.h"
> +#include "llvm/IR/InlineAsm.h"
>  #include "llvm/IR/Intrinsics.h"
>
>  using namespace clang;
> @@ -1412,6 +1413,30 @@
>    }
>    case Builtin::BI__noop:
>      return RValue::get(0);
> +
> +  case Builtin::BI__cpuid: {
> +    llvm::Type *Int32 = Builder.getInt32Ty();
> +    llvm::Type *Int32x4Elems[] = { Int32, Int32, Int32, Int32 };
> +    llvm::StructType *Int32x4 =
> +      llvm::StructType::get(getLLVMContext(),
> +                            llvm::ArrayRef<llvm::Type *>(Int32x4Elems));
> +    llvm::FunctionType *CPUIDFunctionTy =
> +      llvm::FunctionType::get(Int32x4, Int32, false);
> +    llvm::InlineAsm *CPUIDAsm =
> +      llvm::InlineAsm::get(CPUIDFunctionTy,
> +                           "cpuid", "={ax},={bx},={cx},={dx},{ax}",
> +                           /*hasSideEffects=*/false);
> +
> +    llvm::Value *ResultPtr = EmitScalarExpr(E->getArg(0));
> +    llvm::Value *Result =
> +      Builder.CreateCall(CPUIDAsm, EmitScalarExpr(E->getArg(1)));
> +    for (unsigned i = 0; i != 4; ++i) {
> +      llvm::Value *ResultElem = Builder.CreateExtractValue(Result, i);
> +      llvm::Value *ResultElemPtr = Builder.CreateConstGEP1_32(ResultPtr,
> i);
> +      Builder.CreateStore(ResultElem, ResultElemPtr);
> +    }
> +    return RValue::get(0);
> +  }
>    }
>
>    // If this is an alias for a lib function (e.g. __builtin_sin), emit
> Index: test/CodeGen/builtin-ms-cpuid.c
> ===================================================================
> --- /dev/null
> +++ test/CodeGen/builtin-ms-cpuid.c
> @@ -0,0 +1,11 @@
> +// RUN: %clang_cc1 -triple i686-pc-win32 -emit-llvm %s -o - -O |
> FileCheck %s
> +
> +int cid0(int eax) {
> +  // CHECK: @cid0
> +  // CHECK: asm "cpuid"
> +  // CHECK-NEXT: extractvalue
> +  // CHECK-NEXT: ret
> +  int r[4];
> +  __cpuid(r, eax);
> +  return r[0];
> +}
>
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>


-- 
~Craig
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