[Thumb] Handle addressing mode AddrMode5FP16

This addressing mode wasn't checked, so we were running in an assert.

Differential Revision: https://reviews.llvm.org/D43179

llvm-svn: 324996

1 files changed, 14 insertions, 0 deletions

diff --git a/llvm/lib/Target/ARM/Thumb2InstrInfo.cpp b/llvm/lib/Target/ARM/Thumb2InstrInfo.cpp
index c5eb14f3e60..e8259f7edc0 100644
--- a/llvm/lib/Target/ARM/Thumb2InstrInfo.cpp
+++ b/llvm/lib/Target/ARM/Thumb2InstrInfo.cpp
@@ -600,6 +600,20 @@ bool llvm::rewriteT2FrameIndex(MachineInstr &MI, unsigned FrameRegIdx,
         Offset = -Offset;
         isSub = true;
       }
+    } else if (AddrMode == ARMII::AddrMode5FP16) {
+      // VFP address mode.
+      const MachineOperand &OffOp = MI.getOperand(FrameRegIdx+1);
+      int InstrOffs = ARM_AM::getAM5FP16Offset(OffOp.getImm());
+      if (ARM_AM::getAM5FP16Op(OffOp.getImm()) == ARM_AM::sub)
+        InstrOffs *= -1;
+      NumBits = 8;
+      Scale = 2;
+      Offset += InstrOffs * 2;
+      assert((Offset & (Scale-1)) == 0 && "Can't encode this offset!");
+      if (Offset < 0) {
+        Offset = -Offset;
+        isSub = true;
+      }
     } else if (AddrMode == ARMII::AddrModeT2_i8s4) {
       Offset += MI.getOperand(FrameRegIdx + 1).getImm() * 4;
       NumBits = 10; // 8 bits scaled by 4