[SystemZ] Utilize Test Data Class instructions.

This adds a new SystemZ-specific intrinsic, llvm.s390.tdc.f(32|64|128),
which maps straight to the test data class instructions.  A new IR pass
is added to recognize instructions that can be converted to TDC and
perform the necessary replacements.

Differential Revision: http://reviews.llvm.org/D21949

llvm-svn: 275016

1 files changed, 5 insertions, 0 deletions

diff --git a/llvm/lib/Target/SystemZ/SystemZISelLowering.cpp b/llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
index 2259840d2d1..5e1552f586f 100644
--- a/llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
+++ b/llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
@@ -1444,6 +1444,11 @@ static bool isIntrinsicWithCC(SDValue Op, unsigned &Opcode, unsigned &CCValid) {
     CCValid = SystemZ::CCMASK_VCMP;
     return true;
 
+  case Intrinsic::s390_tdc:
+    Opcode = SystemZISD::TDC;
+    CCValid = SystemZ::CCMASK_TDC;
+    return true;
+
   default:
     return false;
   }