ARM has to provide its own TargetLowering::findRepresentativeClass because its scalar floating point registers alias its vector registers.

llvm-svn: 108761

2 files changed, 20 insertions, 0 deletions

diff --git a/llvm/lib/Target/ARM/ARMISelLowering.cpp b/llvm/lib/Target/ARM/ARMISelLowering.cpp
index 9b6db1d2336..9102664c6e9 100644
--- a/llvm/lib/Target/ARM/ARMISelLowering.cpp
+++ b/llvm/lib/Target/ARM/ARMISelLowering.cpp
@@ -550,6 +550,22 @@ ARMTargetLowering::ARMTargetLowering(TargetMachine &TM)
     benefitFromCodePlacementOpt = true;
 }
 
+const TargetRegisterClass *
+ARMTargetLowering::findRepresentativeClass(const TargetRegisterClass *RC) const{
+  switch (RC->getID()) {
+  default:
+    return RC;
+  case ARM::tGPRRegClassID:
+  case ARM::GPRRegClassID:
+    return ARM::GPRRegisterClass;
+  case ARM::SPRRegClassID:
+  case ARM::DPRRegClassID:
+    return ARM::DPRRegisterClass;
+  case ARM::QPRRegClassID:
+    return ARM::QPRRegisterClass;
+  }
+}
+
 const char *ARMTargetLowering::getTargetNodeName(unsigned Opcode) const {
   switch (Opcode) {
   default: return 0;
diff --git a/llvm/lib/Target/ARM/ARMISelLowering.h b/llvm/lib/Target/ARM/ARMISelLowering.h
index 7f37e20724e..ef47003058c 100644
--- a/llvm/lib/Target/ARM/ARMISelLowering.h
+++ b/llvm/lib/Target/ARM/ARMISelLowering.h
@@ -271,6 +271,10 @@ namespace llvm {
     /// materialize the FP immediate as a load from a constant pool.
     virtual bool isFPImmLegal(const APFloat &Imm, EVT VT) const;
 
+  protected:
+    const TargetRegisterClass *
+    findRepresentativeClass(const TargetRegisterClass *RC) const;
+
   private:
     /// Subtarget - Keep a pointer to the ARMSubtarget around so that we can
     /// make the right decision when generating code for different targets.