1 ; Options for the RISC-V port of the compiler
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22 config/riscv/riscv-opts.h
25 Target RejectNegative Joined UInteger Var(riscv_branch_cost)
26 -mbranch-cost=N Set the cost of branches to roughly N instructions.
29 Target Report Var(TARGET_PLT) Init(1)
30 When generating -fpic code, allow the use of PLTs. Ignored for fno-pic.
33 Target Report RejectNegative Joined Enum(abi_type) Var(riscv_abi) Init(ABI_ILP32)
34 Specify integer and floating-point calling convention.
37 Name(abi_type) Type(enum riscv_abi_type)
38 Supported ABIs (for use with the -mabi= option):
41 Enum(abi_type) String(ilp32) Value(ABI_ILP32)
44 Enum(abi_type) String(ilp32f) Value(ABI_ILP32F)
47 Enum(abi_type) String(ilp32d) Value(ABI_ILP32D)
50 Enum(abi_type) String(lp64) Value(ABI_LP64)
53 Enum(abi_type) String(lp64f) Value(ABI_LP64F)
56 Enum(abi_type) String(lp64d) Value(ABI_LP64D)
59 Target Report Mask(FDIV)
60 Use hardware floating-point divide and square root instructions.
63 Target Report Mask(DIV)
64 Use hardware instructions for integer division.
67 Target Report RejectNegative Joined
68 -march= Generate code for given RISC-V ISA (e.g. RV64IM). ISA strings must be
72 Target RejectNegative Joined Var(riscv_tune_string)
73 -mtune=PROCESSOR Optimize the output for PROCESSOR.
76 Target Joined Separate UInteger Var(g_switch_value) Init(8)
77 -msmall-data-limit=N Put global and static data smaller than <number> bytes into a special section (on some targets).
80 Target Report Mask(SAVE_RESTORE)
81 Use smaller but slower prologue and epilogue code.
84 Target Report RejectNegative Joined Enum(code_model) Var(riscv_cmodel) Init(TARGET_DEFAULT_CMODEL)
85 Specify the code model.
88 Target Report Mask(STRICT_ALIGN) Save
89 Do not generate unaligned memory accesses.
92 Name(code_model) Type(enum riscv_code_model)
93 Known code models (for use with the -mcmodel= option):
96 Enum(code_model) String(medlow) Value(CM_MEDLOW)
99 Enum(code_model) String(medany) Value(CM_MEDANY)
102 Target Report Mask(EXPLICIT_RELOCS)
103 Use %reloc() operators, rather than assembly macros, to load addresses.