From 37f2167f15608ff56d202ff21954a456aab6e534 Mon Sep 17 00:00:00 2001
From: Craig Topper <craig.topper@gmail.com>
Date: Tue, 11 Oct 2011 06:44:02 +0000
Subject: Add X86 LZCNT instruction. Including instruction selection support.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141651 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/X86/X86Subtarget.cpp | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'lib/Target/X86/X86Subtarget.cpp')

diff --git a/lib/Target/X86/X86Subtarget.cpp b/lib/Target/X86/X86Subtarget.cpp
index db5792a2b2..c2f60be321 100644
--- a/lib/Target/X86/X86Subtarget.cpp
+++ b/lib/Target/X86/X86Subtarget.cpp
@@ -255,6 +255,10 @@ void X86Subtarget::AutoDetectSubtargetFeatures() {
       HasX86_64 = true;
       ToggleFeature(X86::Feature64Bit);
     }
+    if ((ECX >> 5) & 0x1) {
+      HasLZCNT = true;
+      ToggleFeature(X86::FeatureLZCNT);
+    }
     if (IsAMD && ((ECX >> 6) & 0x1)) {
       HasSSE4A = true;
       ToggleFeature(X86::FeatureSSE4A);
@@ -285,6 +289,7 @@ X86Subtarget::X86Subtarget(const std::string &TT, const std::string &CPU,
   , HasMOVBE(false)
   , HasRDRAND(false)
   , HasF16C(false)
+  , HasLZCNT(false)
   , IsBTMemSlow(false)
   , IsUAMemFast(false)
   , HasVectorUAMem(false)
-- 
cgit v1.2.3-18-g5258