commit 37f2167f15608ff56d202ff21954a456aab6e534
author Craig Topper <craig.topper@gmail.com> Tue Oct 11 06:44:02 2011 +0000
committer Craig Topper <craig.topper@gmail.com> Tue Oct 11 06:44:02 2011 +0000
tree 3ab5d6a05935510edb921aee3198d7abc5007069
parent f7f06103c25f9b4129e7833c8ce5b8c1b1747a6f

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

diff --git a/lib/Target/X86/X86Subtarget.cpp b/lib/Target/X86/X86Subtarget.cpp
index db5792a..c2f60be 100644
--- a/lib/Target/X86/X86Subtarget.cpp
+++ b/lib/Target/X86/X86Subtarget.cpp
@@ -255,6 +255,10 @@
       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 @@
   , HasMOVBE(false)
   , HasRDRAND(false)
   , HasF16C(false)
+  , HasLZCNT(false)
   , IsBTMemSlow(false)
   , IsUAMemFast(false)
   , HasVectorUAMem(false)