From: Steve MacLean, Qualcomm Datacenter Technologies, Inc <sdmaclea@qti.qualcomm.com>
Date: Wed, 26 Apr 2017 22:39:03 +0000 (+0000)
Subject: [Arm64] Update emitOutputInstr to support GC refs in ldp forms
X-Git-Tag: submit/tizen/20210909.063632~11030^2~7095^2
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=9c0e1a9216a3ab2080c7385039d7d0d79946d1dd;p=platform%2Fupstream%2Fdotnet%2Fruntime.git

[Arm64] Update emitOutputInstr to support GC refs in ldp forms


Commit migrated from https://github.com/dotnet/coreclr/commit/47261a0e9b82b735d1efcbd8c0ca0a2a3a75b8c9
---

diff --git a/src/coreclr/src/jit/emitarm64.cpp b/src/coreclr/src/jit/emitarm64.cpp
index 0328cb6..1a56e86 100644
--- a/src/coreclr/src/jit/emitarm64.cpp
+++ b/src/coreclr/src/jit/emitarm64.cpp
@@ -9331,8 +9331,17 @@ size_t emitter::emitOutputInstr(insGroup* ig, instrDesc* id, BYTE** dp)
         {
             // INS_ldp etc...
             // We assume that "idReg1" and "idReg2" are the destination register for all instructions
-            emitGCregDeadUpd(id->idReg1(), dst);
-            emitGCregDeadUpd(id->idReg2(), dst);
+            // TODO-ARM64-CQ: Current limitations only allows using ldp/stp when both of the GC types match
+            if (id->idGCref() != GCT_NONE)
+            {
+                emitGCregLiveUpd(id->idGCref(), id->idReg1(), dst);
+                emitGCregLiveUpd(id->idGCref(), id->idReg2(), dst);
+            }
+            else
+            {
+                emitGCregDeadUpd(id->idReg1(), dst);
+                emitGCregDeadUpd(id->idReg2(), dst);
+            }
         }
         else
         {