RISCVBaseInfo.cpp revision 360784 
1#include "RISCVBaseInfo.h"
2#include "llvm/ADT/ArrayRef.h"
3#include "llvm/ADT/Triple.h"
4#include "llvm/Support/raw_ostream.h"
5
6namespace llvm {
7namespace RISCVSysReg {
8#define GET_SysRegsList_IMPL
9#include "RISCVGenSystemOperands.inc"
10} // namespace RISCVSysReg
11
12namespace RISCVABI {
13ABI computeTargetABI(const Triple &TT, FeatureBitset FeatureBits,
14                     StringRef ABIName) {
15  auto TargetABI = getTargetABI(ABIName);
16  bool IsRV64 = TT.isArch64Bit();
17  bool IsRV32E = FeatureBits[RISCV::FeatureRV32E];
18
19  if (!ABIName.empty() && TargetABI == ABI_Unknown) {
20    errs()
21        << "'" << ABIName
22        << "' is not a recognized ABI for this target (ignoring target-abi)\n";
23  } else if (ABIName.startswith("ilp32") && IsRV64) {
24    errs() << "32-bit ABIs are not supported for 64-bit targets (ignoring "
25              "target-abi)\n";
26    TargetABI = ABI_Unknown;
27  } else if (ABIName.startswith("lp64") && !IsRV64) {
28    errs() << "64-bit ABIs are not supported for 32-bit targets (ignoring "
29              "target-abi)\n";
30    TargetABI = ABI_Unknown;
31  } else if (IsRV32E && TargetABI != ABI_ILP32E && TargetABI != ABI_Unknown) {
32    // TODO: move this checking to RISCVTargetLowering and RISCVAsmParser
33    errs()
34        << "Only the ilp32e ABI is supported for RV32E (ignoring target-abi)\n";
35    TargetABI = ABI_Unknown;
36  }
37
38  if (TargetABI != ABI_Unknown)
39    return TargetABI;
40
41  // For now, default to the ilp32/ilp32e/lp64 ABI if no explicit ABI is given
42  // or an invalid/unrecognised string is given. In the future, it might be
43  // worth changing this to default to ilp32f/lp64f and ilp32d/lp64d when
44  // hardware support for floating point is present.
45  if (IsRV32E)
46    return ABI_ILP32E;
47  if (IsRV64)
48    return ABI_LP64;
49  return ABI_ILP32;
50}
51
52ABI getTargetABI(StringRef ABIName) {
53  auto TargetABI = StringSwitch<ABI>(ABIName)
54                       .Case("ilp32", ABI_ILP32)
55                       .Case("ilp32f", ABI_ILP32F)
56                       .Case("ilp32d", ABI_ILP32D)
57                       .Case("ilp32e", ABI_ILP32E)
58                       .Case("lp64", ABI_LP64)
59                       .Case("lp64f", ABI_LP64F)
60                       .Case("lp64d", ABI_LP64D)
61                       .Default(ABI_Unknown);
62  return TargetABI;
63}
64
65// To avoid the BP value clobbered by a function call, we need to choose a
66// callee saved register to save the value. RV32E only has X8 and X9 as callee
67// saved registers and X8 will be used as fp. So we choose X9 as bp.
68Register getBPReg() { return RISCV::X9; }
69
70} // namespace RISCVABI
71
72namespace RISCVFeatures {
73
74void validate(const Triple &TT, const FeatureBitset &FeatureBits) {
75  if (TT.isArch64Bit() && FeatureBits[RISCV::FeatureRV32E])
76    report_fatal_error("RV32E can't be enabled for an RV64 target");
77}
78
79} // namespace RISCVFeatures
80
81} // namespace llvm
82