[llvm] 5861cf7 - [RISCV] Remove FCSR from RISCVRegisterInfo.

[Craig Topper via llvm-commits]

Author: Craig Topper
Date: 2021-12-10T09:24:13-08:00
New Revision: 5861cf77da4f7d235d435dd8fb89b100d1698112

URL: https://github.com/llvm/llvm-project/commit/5861cf77da4f7d235d435dd8fb89b100d1698112
DIFF: https://github.com/llvm/llvm-project/commit/5861cf77da4f7d235d435dd8fb89b100d1698112.diff

LOG: [RISCV] Remove FCSR from RISCVRegisterInfo.

We only used this to mark it as a reserved register. But that's not
important if we don't do anything else with it.

I think if we were ever to do anything with it, we would need to
model it as a super register of FRM and FFLAGS. But it might be
easier to reference both FRM and FFLAGS in implicit defs/uses
for anything we were to do with "fcsr".

Reviewed By: sepavloff

Differential Revision: https://reviews.llvm.org/D115455

Added: 
    

Modified: 
    llvm/lib/Target/RISCV/RISCVRegisterInfo.cpp
    llvm/lib/Target/RISCV/RISCVRegisterInfo.td

Removed: 
    


################################################################################
diff  --git a/llvm/lib/Target/RISCV/RISCVRegisterInfo.cpp b/llvm/lib/Target/RISCV/RISCVRegisterInfo.cpp
index 798532d5bc44e..9094dff1dda18 100644
--- a/llvm/lib/Target/RISCV/RISCVRegisterInfo.cpp
+++ b/llvm/lib/Target/RISCV/RISCVRegisterInfo.cpp
@@ -105,7 +105,6 @@ BitVector RISCVRegisterInfo::getReservedRegs(const MachineFunction &MF) const {
   // Floating point environment registers.
   markSuperRegs(Reserved, RISCV::FRM);
   markSuperRegs(Reserved, RISCV::FFLAGS);
-  markSuperRegs(Reserved, RISCV::FCSR);
 
   assert(checkAllSuperRegsMarked(Reserved));
   return Reserved;

diff  --git a/llvm/lib/Target/RISCV/RISCVRegisterInfo.td b/llvm/lib/Target/RISCV/RISCVRegisterInfo.td
index 4e03f506d437e..20903b317180e 100644
--- a/llvm/lib/Target/RISCV/RISCVRegisterInfo.td
+++ b/llvm/lib/Target/RISCV/RISCVRegisterInfo.td
@@ -577,7 +577,6 @@ foreach m = LMULList.m in {
 // Special registers
 def FFLAGS : RISCVReg<0, "fflags">;
 def FRM    : RISCVReg<0, "frm">;
-def FCSR   : RISCVReg<0, "fcsr">;
 
 // Any type register. Used for .insn directives when we don't know what the
 // register types could be.