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[thirdparty/gcc.git] / gcc / config / mmix / mmix.opt

; Options for the MMIX port of the compiler.

; Copyright (C) 2005-2022 Free Software Foundation, Inc.
;
; This file is part of GCC.
;
; GCC is free software; you can redistribute it and/or modify it under
; the terms of the GNU General Public License as published by the Free
; Software Foundation; either version 3, or (at your option) any later
; version.
;
; GCC is distributed in the hope that it will be useful, but WITHOUT ANY
; WARRANTY; without even the implied warranty of MERCHANTABILITY or
; FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
; for more details.
;
; You should have received a copy of the GNU General Public License
; along with GCC; see the file COPYING3.  If not see
; <http://www.gnu.org/licenses/>.

; FIXME: Get rid of this one.
mlibfuncs
Target Mask(LIBFUNC)
For intrinsics library: pass all parameters in registers.

mabi=mmixware
Target RejectNegative InverseMask(ABI_GNU)
Use register stack for parameters and return value.

mabi=gnu
Target RejectNegative Mask(ABI_GNU)
Use call-clobbered registers for parameters and return value.

; FIXME: Provide a way to *load* the epsilon register.
mepsilon
Target Mask(FCMP_EPSILON)
Use epsilon-respecting floating point compare instructions.

mzero-extend
Target Mask(ZERO_EXTEND)
Use zero-extending memory loads, not sign-extending ones.

mknuthdiv
Target Mask(KNUTH_DIVISION)
Generate divide results with reminder having the same sign as the divisor (not the dividend).

mtoplevel-symbols
Target Mask(TOPLEVEL_SYMBOLS)
Prepend global symbols with \":\" (for use with PREFIX).

mno-set-program-start
Target RejectNegative
Do not provide a default start-address 0x100 of the program.

melf
Target RejectNegative
Link to emit program in ELF format (rather than mmo).

mbranch-predict
Target RejectNegative Mask(BRANCH_PREDICT)
Use P-mnemonics for branches statically predicted as taken.

mno-branch-predict
Target RejectNegative InverseMask(BRANCH_PREDICT)
Don't use P-mnemonics for branches.

; We use the term "base address" since that's what Knuth uses.  The base
; address goes in a global register.  When addressing, it's more like
; "base address plus offset", with the offset being 0..255 from the base,
; which itself can be a symbol plus an offset.  The effect is like having
; a constant pool in global registers, code offsetting from those
; registers (automatically causing a request for a suitable constant base
; address register) without having to know the specific register or the
; specific offset.  The setback is that there's a limited number of
; registers, and you'll not find out until link time whether you
; should have compiled with -mno-base-addresses.
mbase-addresses
Target RejectNegative Mask(BASE_ADDRESSES)
Use addresses that allocate global registers.

mno-base-addresses
Target RejectNegative InverseMask(BASE_ADDRESSES)
Do not use addresses that allocate global registers.

msingle-exit
Target RejectNegative InverseMask(USE_RETURN_INSN)
Generate a single exit point for each function.

mno-single-exit
Target RejectNegative Mask(USE_RETURN_INSN)
Do not generate a single exit point for each function.

mset-program-start=
Target RejectNegative Joined
Set start-address of the program.

mset-data-start=
Target RejectNegative Joined
Set start-address of data.