ARM: support high registers in __builtin_longjmp on WoA

Windows on ARM uses a pure thumb-2 environment.  This means that it can select a
high register when doing a __builtin_longjmp.  We would use a tLDRi which would
truncate the register to a low register.  Use a t2LDRi12 to get the full
register file access.  Tweak the code to just load into PC, as that is an
interworking branch on all supported cores anyways.

llvm-svn: 274815

1 files changed, 2 insertions, 1 deletions

diff --git a/llvm/lib/Target/ARM/ARMBaseInstrInfo.cpp b/llvm/lib/Target/ARM/ARMBaseInstrInfo.cpp
index a1b16525975..3dafb8f633e 100644
--- a/llvm/lib/Target/ARM/ARMBaseInstrInfo.cpp
+++ b/llvm/lib/Target/ARM/ARMBaseInstrInfo.cpp
@@ -648,8 +648,9 @@ unsigned ARMBaseInstrInfo::GetInstSizeInBytes(const MachineInstr &MI) const {
   case ARM::Int_eh_sjlj_longjmp:
     return 16;
   case ARM::tInt_eh_sjlj_longjmp:
-  case ARM::tInt_WIN_eh_sjlj_longjmp:
     return 10;
+  case ARM::tInt_WIN_eh_sjlj_longjmp:
+    return 12;
   case ARM::Int_eh_sjlj_setjmp:
   case ARM::Int_eh_sjlj_setjmp_nofp:
     return 20;