From: Hal Finkel <hfinkel@anl.gov>
Date: Tue, 7 Aug 2012 17:04:20 +0000 (+0000)
Subject: Add a comment about mftb vs. mfspr on PPC.
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=8da94ad6e0947690201c543da556ec0396ad9912;p=oota-llvm.git

Add a comment about mftb vs. mfspr on PPC.

Thanks to Alex Rosenberg for the suggestion.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161428 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/PowerPC/PPCInstr64Bit.td b/lib/Target/PowerPC/PPCInstr64Bit.td
index 5df735aaba7..39778a5dc1e 100644
--- a/lib/Target/PowerPC/PPCInstr64Bit.td
+++ b/lib/Target/PowerPC/PPCInstr64Bit.td
@@ -269,6 +269,10 @@ let Pattern = [(set G8RC:$rT, readcyclecounter)] in
 def MFTB8 : XFXForm_1_ext<31, 339, 268, (outs G8RC:$rT), (ins),
                           "mfspr $rT, 268", SprMFTB>,
             PPC970_DGroup_First, PPC970_Unit_FXU;
+// Note that encoding mftb using mfspr is now the preferred form,
+// and has been since at least ISA v2.03. The mftb instruction has
+// now been phased out. Using mfspr, however, is known not to work on
+// the POWER3.
 
 let Defs = [X1], Uses = [X1] in
 def DYNALLOC8 : Pseudo<(outs G8RC:$result), (ins G8RC:$negsize, memri:$fpsi),"",