компилятор C и C ++ проекта GNU (GNU project C and C++ compiler)
Параметры подробно (Options detail)
picoChip
These -m options are defined for picoChip implementations:
-mae=ae_type
Set the instruction set, register set, and instruction
scheduling parameters for array element type ae_type.
Supported values for ae_type are ANY, MUL, and MAC.
-mae=ANY selects a completely generic AE type. Code
generated with this option runs on any of the other AE types.
The code is not as efficient as it would be if compiled for a
specific AE type, and some types of operation (e.g.,
multiplication) do not work properly on all types of AE.
-mae=MUL selects a MUL AE type. This is the most useful AE
type for compiled code, and is the default.
-mae=MAC selects a DSP-style MAC AE. Code compiled with this
option may suffer from poor performance of byte (char)
manipulation, since the DSP AE does not provide hardware
support for byte load/stores.
-msymbol-as-address
Enable the compiler to directly use a symbol name as an
address in a load/store instruction, without first loading it
into a register. Typically, the use of this option generates
larger programs, which run faster than when the option isn't
used. However, the results vary from program to program, so
it is left as a user option, rather than being permanently
enabled.
-mno-inefficient-warnings
Disables warnings about the generation of inefficient code.
These warnings can be generated, for example, when compiling
code that performs byte-level memory operations on the MAC AE
type. The MAC AE has no hardware support for byte-level
memory operations, so all byte load/stores must be
synthesized from word load/store operations. This is
inefficient and a warning is generated to indicate that you
should rewrite the code to avoid byte operations, or to
target an AE type that has the necessary hardware support.
This option disables these warnings.
