From bb7d7b3d33e856e8a640d394954a29a59b32a3e6 Mon Sep 17 00:00:00 2001
From: Tim Northover <tnorthover@apple.com>
Date: Fri, 7 Sep 2018 09:21:25 +0000
Subject: ARM: fix Thumb2 CodeGen for ldrex with folded frame-index.

Because t2LDREX (& t2STREX) were marked as AddrModeNone, but did allow a
FrameIndex operand, rewriteT2FrameIndex asserted. This gives them a
proper addressing-mode and tells the rewriter about it so that encodable
offsets are exploited and others are rejected.

Should fix PR38828.

llvm-svn: 341642
---
 llvm/lib/Target/ARM/ARMFrameLowering.cpp | 1 +
 1 file changed, 1 insertion(+)

(limited to 'llvm/lib/Target/ARM/ARMFrameLowering.cpp')

diff --git a/llvm/lib/Target/ARM/ARMFrameLowering.cpp b/llvm/lib/Target/ARM/ARMFrameLowering.cpp
index 2f5701934a2..742d5dd3d8c 100644
--- a/llvm/lib/Target/ARM/ARMFrameLowering.cpp
+++ b/llvm/lib/Target/ARM/ARMFrameLowering.cpp
@@ -1516,6 +1516,7 @@ static unsigned estimateRSStackSizeLimit(MachineFunction &MF,
           break;
         case ARMII::AddrMode5:
         case ARMII::AddrModeT2_i8s4:
+        case ARMII::AddrModeT2_ldrex:
           Limit = std::min(Limit, ((1U << 8) - 1) * 4);
           break;
         case ARMII::AddrModeT2_i12:
-- 
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