llvm optimization fix

0001-fix-optimization.patch

From 8a774f05eb559437b2ac40dbe62f2b78ac9287a9 Mon Sep 17 00:00:00 2001
From: Colin Samples <colin.samples+git@gmail.com>
Date: Sat, 19 Oct 2019 15:57:08 -0400
Subject: [PATCH] fix optimization

---
 llvm/lib/Target/PowerPC/PPCMIPeephole.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/llvm/lib/Target/PowerPC/PPCMIPeephole.cpp b/llvm/lib/Target/PowerPC/PPCMIPeephole.cpp
index ac8ac060f46..f260aff073b 100644
--- a/llvm/lib/Target/PowerPC/PPCMIPeephole.cpp
+++ b/llvm/lib/Target/PowerPC/PPCMIPeephole.cpp
@@ -386,7 +386,8 @@ bool PPCMIPeephole::simplifyCode(void) {
               unsigned FeedReg2 =
                 TRI->lookThruCopyLike(DefMI->getOperand(2).getReg(), MRI);
 
-              if ((FeedImmed == 0 || FeedImmed == 3) && FeedReg1 == FeedReg2) {
+              if ((FeedImmed == 0 || FeedImmed == 3) && FeedReg1 == FeedReg2 &&
+                  MRI->hasOneDef(FeedReg1)) {
                 LLVM_DEBUG(dbgs() << "Optimizing splat/swap or splat/splat "
                                      "to splat/copy: ");
                 LLVM_DEBUG(MI.dump());
-- 
2.23.0