[RISCV] Correct the CallPreservedMask for the function call in an interrupt handler

CallPreservedMask is used to describe the register liveness after a
function call. The function call in an interrupt handler should use the same
CallPreservedMask as normal functions. So that only callee save registers
can live through the function call.

(cherry picked from commit 1cae2f9d192c69833e22684ca338660942ab464e)

1 files changed, 0 insertions, 7 deletions

diff --git a/llvm/lib/Target/RISCV/RISCVRegisterInfo.cpp b/llvm/lib/Target/RISCV/RISCVRegisterInfo.cpp
index 1d41994ef1e..207742520ed 100644
--- a/llvm/lib/Target/RISCV/RISCVRegisterInfo.cpp
+++ b/llvm/lib/Target/RISCV/RISCVRegisterInfo.cpp
@@ -156,13 +156,6 @@ const uint32_t *
 RISCVRegisterInfo::getCallPreservedMask(const MachineFunction & MF,
                                         CallingConv::ID /*CC*/) const {
   auto &Subtarget = MF.getSubtarget<RISCVSubtarget>();
-  if (MF.getFunction().hasFnAttribute("interrupt")) {
-    if (Subtarget.hasStdExtD())
-      return CSR_XLEN_F64_Interrupt_RegMask;
-    if (Subtarget.hasStdExtF())
-      return CSR_XLEN_F32_Interrupt_RegMask;
-    return CSR_Interrupt_RegMask;
-  }
 
   switch (Subtarget.getTargetABI()) {
   default: