f1f59bc724
PR target/50910 * config/avr/avr.opt (-mbranch-cost=): New option. * config/avr/avr.h (BRANCH_COST): Define to avr_branch_cost. * config/avr/avr.c (avr_rtx_costs_1): Adjust [U]DIV/[U]MOD costs. * config/avr/avr.md (*addqi3.lt0, *addhi3.lt0, *addsi3.lt0): New insns. (*addhi3_zero_extend1): Remov % in constraint of operand 1. (*addhi3.sign_extend1, *subhi3.sign_extend2): New insns. From-SVN: r180739
80 lines
2.9 KiB
Plaintext
80 lines
2.9 KiB
Plaintext
; Options for the ATMEL AVR port of the compiler.
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; Copyright (C) 2005, 2007, 2008, 2010, 2011 Free Software Foundation, Inc.
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;
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; This file is part of GCC.
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;
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; GCC is free software; you can redistribute it and/or modify it under
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; the terms of the GNU General Public License as published by the Free
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; Software Foundation; either version 3, or (at your option) any later
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; version.
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;
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; GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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; WARRANTY; without even the implied warranty of MERCHANTABILITY or
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; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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; for more details.
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;
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; You should have received a copy of the GNU General Public License
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; along with GCC; see the file COPYING3. If not see
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; <http://www.gnu.org/licenses/>.
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mcall-prologues
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Target Report Mask(CALL_PROLOGUES)
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Use subroutines for function prologues and epilogues
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mmcu=
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Target RejectNegative Joined Var(avr_mcu_index) Init(0) Enum(avr_mcu)
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-mmcu=MCU Select the target MCU
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mdeb
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Target Report Undocumented Mask(ALL_DEBUG)
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mlog=
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Target RejectNegative Joined Undocumented Var(avr_log_details)
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mint8
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Target Report Mask(INT8)
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Use an 8-bit 'int' type
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mno-interrupts
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Target Report RejectNegative Mask(NO_INTERRUPTS)
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Change the stack pointer without disabling interrupts
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mbranch-cost=
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Target Report Joined RejectNegative UInteger Var(avr_branch_cost) Init(0)
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Set the branch costs for conditional branch instructions. Reasonable values are small, non-negative integers. The default branch cost is 0.
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morder1
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Target Report Undocumented Mask(ORDER_1)
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morder2
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Target Report Undocumented Mask(ORDER_2)
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mshort-calls
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Target Report Mask(SHORT_CALLS)
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Use rjmp/rcall (limited range) on >8K devices
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mtiny-stack
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Target Report Mask(TINY_STACK)
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Change only the low 8 bits of the stack pointer
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mrelax
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Target Report
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Relax branches
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mpmem-wrap-around
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Target Report
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Make the linker relaxation machine assume that a program counter wrap-around occurs.
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maccumulate-args
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Target Report Mask(ACCUMULATE_OUTGOING_ARGS)
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Accumulate outgoing function arguments and acquire/release the needed stack space for outpoing function arguments in function prologue/epilogue. Without this option, outgoing arguments are pushed before calling a function and popped afterwards. This option can lead to reduced code size for functions that call many functions that get their arguments on the stack like, for example printf.
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mstrict-X
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Target Report Var(avr_strict_X) Init(0)
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When accessing RAM, use X as imposed by the hardware, i.e. just use pre-decrement, post-increment and indirect addressing with the X register. Without this option, the compiler may assume that there is an addressing mode X+const similar to Y+const and Z+const and emit instructions to emulate such an addressing mode for X.
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mbranch-cost=
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Target Report RejectNegative Joined UInteger Var(avr_branch_cost) Init(0)
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Set the cost of a branch instruction. Default value is 0.
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