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ARM pre-v6 alias for 'nop' to 'mov r0, r0'

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@152185 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jim Grosbach 2012-03-07 00:52:41 +00:00
parent ff3164a189
commit 0104dd3ffd
1 changed files with 4 additions and 0 deletions
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4
lib/Target/ARM/ARMInstrInfo.td
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@ -5252,6 +5252,10 @@ def : ARMInstAlias<"mul${s}${p} $Rn, $Rm",
def : ARMInstAlias<"neg${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)>;