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.
36 mpreferred-stack-boundary=
37 Target RejectNegative Joined UInteger Var(riscv_preferred_stack_boundary_arg)
38 Attempt to keep stack aligned to this power of 2.
41 Name(abi_type) Type(enum riscv_abi_type)
42 Supported ABIs (for use with the -mabi= option):
45 Enum(abi_type) String(ilp32) Value(ABI_ILP32)
48 Enum(abi_type) String(ilp32e) Value(ABI_ILP32E)
51 Enum(abi_type) String(ilp32f) Value(ABI_ILP32F)
54 Enum(abi_type) String(ilp32d) Value(ABI_ILP32D)
57 Enum(abi_type) String(lp64) Value(ABI_LP64)
60 Enum(abi_type) String(lp64f) Value(ABI_LP64F)
63 Enum(abi_type) String(lp64d) Value(ABI_LP64D)
66 Target Report Mask(FDIV)
67 Use hardware floating-point divide and square root instructions.
70 Target Report Mask(DIV)
71 Use hardware instructions for integer division.
74 Target Report RejectNegative Joined
75 -march= Generate code for given RISC-V ISA (e.g. RV64IM). ISA strings must be
79 Target RejectNegative Joined Var(riscv_tune_string)
80 -mtune=PROCESSOR Optimize the output for PROCESSOR.
83 Target Joined Separate UInteger Var(g_switch_value) Init(8)
84 -msmall-data-limit=N Put global and static data smaller than <number> bytes into a special section (on some targets).
87 Target Report Mask(SAVE_RESTORE)
88 Use smaller but slower prologue and epilogue code.
91 Target Report RejectNegative Joined Enum(code_model) Var(riscv_cmodel) Init(TARGET_DEFAULT_CMODEL)
92 Specify the code model.
95 Target Report Mask(STRICT_ALIGN) Save
96 Do not generate unaligned memory accesses.
99 Name(code_model) Type(enum riscv_code_model)
100 Known code models (for use with the -mcmodel= option):
103 Enum(code_model) String(medlow) Value(CM_MEDLOW)
106 Enum(code_model) String(medany) Value(CM_MEDANY)
109 Target Report Mask(EXPLICIT_RELOCS)
110 Use %reloc() operators, rather than assembly macros, to load addresses.
113 Target Bool Var(riscv_mrelax) Init(1)
114 Take advantage of linker relaxations to reduce the number of instructions
115 required to materialize symbol addresses.
132 Target Report Var(riscv_emit_attribute_p) Init(-1)
133 Emit RISC-V ELF attribute.
136 Target RejectNegative Joined Var(riscv_align_data_type) Enum(riscv_align_data) Init(riscv_align_data_type_xlen)
137 Use the given data alignment.
140 Name(riscv_align_data) Type(enum riscv_align_data)
141 Known data alignment choices (for use with the -malign-data= option):
144 Enum(riscv_align_data) String(xlen) Value(riscv_align_data_type_xlen)
147 Enum(riscv_align_data) String(natural) Value(riscv_align_data_type_natural)