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
diff --git a/llvm/lib/Target/ARM/ARMFrameLowering.cpp b/llvm/lib/Target/ARM/ARMFrameLowering.cpp
index 2f57019..742d5dd 100644
--- a/llvm/lib/Target/ARM/ARMFrameLowering.cpp
+++ b/llvm/lib/Target/ARM/ARMFrameLowering.cpp
@@ -1516,6 +1516,7 @@
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: