Add intrinsics for Ivy Bridge's rdrand instruction.

The rdrand/cmov sequence is the same that is emitted by both
GCC and ICC.

Fixes PR13284.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160117 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 11 insertions, 0 deletions

diff --git a/include/llvm/IntrinsicsX86.td b/include/llvm/IntrinsicsX86.td
index 14fd76d213..e8039f2358 100644
--- a/include/llvm/IntrinsicsX86.td
+++ b/include/llvm/IntrinsicsX86.td
@@ -2536,3 +2536,14 @@ let TargetPrefix = "x86" in {  // All intrinsics start with "llvm.x86.".
               Intrinsic<[llvm_v8i16_ty], [llvm_v8f32_ty, llvm_i32_ty],
                         [IntrNoMem]>;
 }
+
+//===----------------------------------------------------------------------===//
+// RDRAND intrinsics. Return a random value and whether it is valid.
+
+let TargetPrefix = "x86" in {  // All intrinsics start with "llvm.x86.".
+  // These are declared side-effecting so they don't get eliminated by CSE or
+  // LICM.
+  def int_x86_rdrand_16 : Intrinsic<[llvm_i16_ty, llvm_i32_ty], [], []>;
+  def int_x86_rdrand_32 : Intrinsic<[llvm_i32_ty, llvm_i32_ty], [], []>;
+  def int_x86_rdrand_64 : Intrinsic<[llvm_i64_ty, llvm_i32_ty], [], []>;
+}