Allow TargetLowering::getRegClassFor() to be called on illegal types. Also
allow target to override it in order to map register classes to illegal
but synthesizable types. e.g. v4i64, v8i64 for ARM / NEON.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103854 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/ARMISelLowering.cpp b/lib/Target/ARM/ARMISelLowering.cpp
index 529f711..9db6411 100644
--- a/lib/Target/ARM/ARMISelLowering.cpp
+++ b/lib/Target/ARM/ARMISelLowering.cpp
@@ -266,13 +266,6 @@
addQRTypeForNEON(MVT::v4i32);
addQRTypeForNEON(MVT::v2i64);
- // Map v4i64 to QQ registers but do not make the type legal for any
- // operations. Similarly map v8i64 to QQQQ registers. v4i64 and v8i64 are
- // only used for REG_SEQUENCE to load / store 4 to 8 consecutive
- // D registers.
- addRegisterClass(MVT::v4i64, ARM::QQPRRegisterClass);
- addRegisterClass(MVT::v8i64, ARM::QQQQPRRegisterClass);
-
// v2f64 is legal so that QR subregs can be extracted as f64 elements, but
// neither Neon nor VFP support any arithmetic operations on it.
setOperationAction(ISD::FADD, MVT::v2f64, Expand);
@@ -586,6 +579,19 @@
}
}
+/// getRegClassFor - Return the register class that should be used for the
+/// specified value type.
+TargetRegisterClass *ARMTargetLowering::getRegClassFor(EVT VT) const {
+ // Map v4i64 to QQ registers but do not make the type legal. Similarly map
+ // v8i64 to QQQQ registers. v4i64 and v8i64 are only used for REG_SEQUENCE to
+ // load / store 4 to 8 consecutive D registers.
+ if (VT == MVT::v4i64)
+ return ARM::QQPRRegisterClass;
+ else if (VT == MVT::v8i64)
+ return ARM::QQQQPRRegisterClass;
+ return TargetLowering::getRegClassFor(VT);
+}
+
/// getFunctionAlignment - Return the Log2 alignment of this function.
unsigned ARMTargetLowering::getFunctionAlignment(const Function *F) const {
return getTargetMachine().getSubtarget<ARMSubtarget>().isThumb() ? 0 : 1;
diff --git a/lib/Target/ARM/ARMISelLowering.h b/lib/Target/ARM/ARMISelLowering.h
index 7e1132e..54dfb42 100644
--- a/lib/Target/ARM/ARMISelLowering.h
+++ b/lib/Target/ARM/ARMISelLowering.h
@@ -240,6 +240,10 @@
return Subtarget;
}
+ /// getRegClassFor - Return the register class that should be used for the
+ /// specified value type.
+ virtual TargetRegisterClass *getRegClassFor(EVT VT) const;
+
/// getFunctionAlignment - Return the Log2 alignment of this function.
virtual unsigned getFunctionAlignment(const Function *F) const;