ARM: recommit r237590: allow jump tables to be placed as constant islands.
The original version didn't properly account for the base register
being modified before the final jump, so caused miscompilations in
Chromium and LLVM. I've fixed this and tested with an LLVM self-host
(I don't have the means to build & test Chromium).
The general idea remains the same: in pathological cases jump tables
can be too far away from the instructions referencing them (like other
constants) so they need to be movable.
Should fix PR23627.
llvm-svn: 238680
diff --git a/llvm/lib/Target/ARM/ARMAsmPrinter.h b/llvm/lib/Target/ARM/ARMAsmPrinter.h
index 7bfb944..a6bc368 100644
--- a/llvm/lib/Target/ARM/ARMAsmPrinter.h
+++ b/llvm/lib/Target/ARM/ARMAsmPrinter.h
@@ -71,8 +71,9 @@
void emitInlineAsmEnd(const MCSubtargetInfo &StartInfo,
const MCSubtargetInfo *EndInfo) const override;
- void EmitJumpTable(const MachineInstr *MI);
- void EmitJump2Table(const MachineInstr *MI);
+ void EmitJumpTableAddrs(const MachineInstr *MI);
+ void EmitJumpTableInsts(const MachineInstr *MI);
+ void EmitJumpTableTBInst(const MachineInstr *MI, unsigned OffsetWidth);
void EmitInstruction(const MachineInstr *MI) override;
bool runOnMachineFunction(MachineFunction &F) override;