Add target a target hook to get the register number used by the compact unwind

encoding for the registers it knows about. Return -1 if it can't handle that
register.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134202 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 10 insertions, 0 deletions

diff --git a/include/llvm/Target/TargetAsmInfo.h b/include/llvm/Target/TargetAsmInfo.h
index abaed81..1a417a1 100644
--- a/include/llvm/Target/TargetAsmInfo.h
+++ b/include/llvm/Target/TargetAsmInfo.h
@@ -106,6 +106,10 @@ public:
   int getSEHRegNum(unsigned RegNum) const {
     return TRI->getSEHRegNum(RegNum);
   }
+
+  int getCompactUnwindRegNum(unsigned RegNum) const {
+    return TRI->getCompactUnwindRegNum(RegNum);
+  }
 };
 
 }
diff --git a/include/llvm/Target/TargetRegisterInfo.h b/include/llvm/Target/TargetRegisterInfo.h
index 2965b1d..3f28f6c 100644
--- a/include/llvm/Target/TargetRegisterInfo.h
+++ b/include/llvm/Target/TargetRegisterInfo.h
@@ -720,6 +720,12 @@ public:
   virtual int getSEHRegNum(unsigned i) const {
     return i;
   }
+
+  /// getCompactUnwindRegNum - This function maps the register to the number for
+  /// compact unwind encoding. Return -1 if the register isn't valid.
+  virtual int getCompactUnwindRegNum(unsigned) const {
+    return -1;
+  }
 };