[MC] Assert that MCRegUnitIterator operates over MCRegisters

The signature of the ctor expects a MCRegister, but currently any
unsigned value can be converted to a MCRegister.

This patch checks that indeed the provided value is a physical register
only. We want to eventually stop implicitly converting unsigned or
Register to MCRegister (which is incorrect). The next step after this
patch is changing uses of MCRegUnitIterator to explicitly cast Register
or unsigned values to MCRegister. To that end, this patch also
introduces 2 APIs that make that conversion checked and explicit.

Differential Revision: https://reviews.llvm.org/D88705

3 files changed, 16 insertions, 0 deletions

diff --git a/llvm/include/llvm/CodeGen/Register.h b/llvm/include/llvm/CodeGen/Register.h
index 884c8bc..86dde8e 100644
--- a/llvm/include/llvm/CodeGen/Register.h
+++ b/llvm/include/llvm/CodeGen/Register.h
@@ -110,6 +110,15 @@ public:
     return MCRegister(Reg);
   }
 
+  /// Utility to check-convert this value to a MCRegister. The caller is
+  /// expected to have already validated that this Register is, indeed,
+  /// physical.
+  MCRegister asMCReg() const {
+    assert(Reg == MCRegister::NoRegister ||
+           MCRegister::isPhysicalRegister(Reg));
+    return MCRegister(Reg);
+  }
+
   bool isValid() const { return Reg != MCRegister::NoRegister; }
 
   /// Comparisons between register objects
diff --git a/llvm/include/llvm/MC/MCRegister.h b/llvm/include/llvm/MC/MCRegister.h
index 5f2e31b..21ffe28 100644
--- a/llvm/include/llvm/MC/MCRegister.h
+++ b/llvm/include/llvm/MC/MCRegister.h
@@ -68,6 +68,12 @@ public:
     return Reg;
   }
 
+  /// Check the provided unsigned value is a valid MCRegister.
+  static MCRegister from(unsigned Val) {
+    assert(Val == NoRegister || isPhysicalRegister(Val));
+    return MCRegister(Val);
+  }
+
   unsigned id() const {
     return Reg;
   }
diff --git a/llvm/include/llvm/MC/MCRegisterInfo.h b/llvm/include/llvm/MC/MCRegisterInfo.h
index 9864d95..0c1ac62 100644
--- a/llvm/include/llvm/MC/MCRegisterInfo.h
+++ b/llvm/include/llvm/MC/MCRegisterInfo.h
@@ -675,6 +675,7 @@ public:
 
   MCRegUnitIterator(MCRegister Reg, const MCRegisterInfo *MCRI) {
     assert(Reg && "Null register has no regunits");
+    assert(MCRegister::isPhysicalRegister(Reg.id()));
     // Decode the RegUnits MCRegisterDesc field.
     unsigned RU = MCRI->get(Reg).RegUnits;
     unsigned Scale = RU & 15;