[RISCV][NFC] Rename callee saved regs 'CSR' to CSR_ILP32_LP64 and minor RISCVRegisterInfo refactoring
The CSR renaming further prepares the way for an upcoming patch adding support for more
RISC-V ABIs.
Modify RISCVRegisterInfo::getCalleeSavedRegs and
RISCVRegisterInfo::getReservedRegs to do MF->getSubtarget<RISCVSubtarget>()
once rather than multiple times.
llvm-svn: 356123
diff --git a/llvm/lib/Target/RISCV/RISCVCallingConv.td b/llvm/lib/Target/RISCV/RISCVCallingConv.td
index 6510602..6b22b41 100644
--- a/llvm/lib/Target/RISCV/RISCVCallingConv.td
+++ b/llvm/lib/Target/RISCV/RISCVCallingConv.td
@@ -13,7 +13,8 @@
// The RISC-V calling convention is handled with custom code in
// RISCVISelLowering.cpp (CC_RISCV).
-def CSR : CalleeSavedRegs<(add X1, X3, X4, X8, X9, (sequence "X%u", 18, 27))>;
+def CSR_ILP32_LP64
+ : CalleeSavedRegs<(add X1, X3, X4, X8, X9, (sequence "X%u", 18, 27))>;
// Needed for implementation of RISCVRegisterInfo::getNoPreservedMask()
def CSR_NoRegs : CalleeSavedRegs<(add)>;