Add two new calling conventions for runtime calls

This patch adds two new target-independent calling conventions for runtime
calls - PreserveMost and PreserveAll.
The target-specific implementation for X86-64 is defined as following:
  - Arguments are passed as for the default C calling convention
  - The same applies for the return value(s)
  - PreserveMost preserves all GPRs - except R11
  - PreserveAll preserves all GPRs and all XMMs/YMMs - except R11

Reviewed by Lang and Philip

llvm-svn: 199508

1 files changed, 12 insertions, 0 deletions

diff --git a/llvm/lib/Target/X86/X86RegisterInfo.cpp b/llvm/lib/Target/X86/X86RegisterInfo.cpp
index 220dc433fef..8a65dc1f2f7 100644
--- a/llvm/lib/Target/X86/X86RegisterInfo.cpp
+++ b/llvm/lib/Target/X86/X86RegisterInfo.cpp
@@ -245,6 +245,12 @@ X86RegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const {
     if (HasAVX)
       return CSR_64_AllRegs_AVX_SaveList;
     return CSR_64_AllRegs_SaveList;
+  case CallingConv::PreserveMost:
+    return CSR_64_RT_MostRegs_SaveList;
+  case CallingConv::PreserveAll:
+    if (HasAVX)
+      return CSR_64_RT_AllRegs_AVX_SaveList;
+    return CSR_64_RT_AllRegs_SaveList;
   case CallingConv::Intel_OCL_BI: {
     if (HasAVX512 && IsWin64)
       return CSR_Win64_Intel_OCL_BI_AVX512_SaveList;
@@ -292,6 +298,12 @@ X86RegisterInfo::getCallPreservedMask(CallingConv::ID CC) const {
     if (HasAVX)
       return CSR_64_AllRegs_AVX_RegMask;
     return CSR_64_AllRegs_RegMask;
+  case CallingConv::PreserveMost:
+    return CSR_64_RT_MostRegs_RegMask;
+  case CallingConv::PreserveAll:
+    if (HasAVX)
+      return CSR_64_RT_AllRegs_AVX_RegMask;
+    return CSR_64_RT_AllRegs_RegMask;
   case CallingConv::Intel_OCL_BI: {
     if (IsWin64 && HasAVX512)
       return CSR_Win64_Intel_OCL_BI_AVX512_RegMask;