[llvm-commits] [llvm] r152185 - /llvm/trunk/lib/Target/ARM/ARMInstrInfo.td

[Jim Grosbach]

Author: grosbach
Date: Tue Mar  6 18:52:41 2012
New Revision: 152185

URL: http://llvm.org/viewvc/llvm-project?rev=152185&view=rev
Log:
ARM pre-v6 alias for 'nop' to 'mov r0, r0'

Modified:
    llvm/trunk/lib/Target/ARM/ARMInstrInfo.td

Modified: llvm/trunk/lib/Target/ARM/ARMInstrInfo.td
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/ARM/ARMInstrInfo.td?rev=152185&r1=152184&r2=152185&view=diff
==============================================================================
--- llvm/trunk/lib/Target/ARM/ARMInstrInfo.td (original)
+++ llvm/trunk/lib/Target/ARM/ARMInstrInfo.td Tue Mar  6 18:52:41 2012
@@ -5252,6 +5252,10 @@
 def : ARMInstAlias<"neg${s}${p} $Rd, $Rm",
                    (RSBri GPR:$Rd, GPR:$Rm, 0, pred:$p, cc_out:$s)>;
 
+// Pre-v6, 'mov r0, r0' was used as a NOP encoding.
+def : InstAlias<"nop${p}", (MOVr R0, R0, pred:$p, zero_reg)>,
+         Requires<[IsARM, NoV6]>;
+
 // 'it' blocks in ARM mode just validate the predicates. The IT itself
 // is discarded.
 def ITasm : ARMAsmPseudo<"it$mask $cc", (ins it_pred:$cc, it_mask:$mask)>;