From: Evandro Menezes <e.menezes@samsung.com>
Date: Wed, 19 Dec 2018 22:24:31 +0000 (+0000)
Subject: [AArch64] Use canonical copy idiom
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=f236e027c64bfe2914a6da4623589019c8a7104a;p=llvm

[AArch64] Use canonical copy idiom

Use only the canonical form of the alias for register transfers in the
`IsCopyIdiomPred` predicate.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@349685 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/AArch64/AArch64SchedPredicates.td b/lib/Target/AArch64/AArch64SchedPredicates.td
index a48f1dcffaf..d5e5acccc4a 100644
--- a/lib/Target/AArch64/AArch64SchedPredicates.td
+++ b/lib/Target/AArch64/AArch64SchedPredicates.td
@@ -295,9 +295,7 @@ def IsCopyIdiomFn     : TIIPredicate<"isCopyIdiom",
                                                CheckIsRegOperand<2>,
                                                CheckAny<
                                                  [CheckRegOperand<1, WZR>,
-                                                  CheckRegOperand<1, XZR>,
-                                                  CheckRegOperand<2, WZR>,
-                                                  CheckRegOperand<2, XZR>]>,
+                                                  CheckRegOperand<1, XZR>]>,
                                                CheckShiftBy0]>>>],
                                        MCReturnStatement<FalsePred>>>;
 def IsCopyIdiomPred   : MCSchedPredicate<IsCopyIdiomFn>;