cb0ca2844b
* README.C4X: New file with information about the c4x ports.
* ginclude/va-c4x.h: New file for c4x varargs support.
* config/c4x: New directory with c4x port files.
From-SVN: r22475
49 lines
2.0 KiB
Plaintext
49 lines
2.0 KiB
Plaintext
This file describes the implementation notes of the GNU C Compiler for
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the Texas Instruments Floating Point Digital Signal Processor
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families, TMS320C3x and TMS320C4x (including the C30, C31, C32, C40,
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and C44 chips).
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Currently, only two code variants are generated---those for the C3x
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and C4x architectures. Note that the new operand combinations for
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parallel instructions, included in newer silicon revisions, are not
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yet supported. These should be trivial to add for someone with the
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newer chips and the inclination.
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While the generated assembly code is fairly similar to that recognised
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by the TI assembler, there are a few differences (currently the machine
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option -mti, designed to enfore compatibility, is not fully
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implemented). The major difference is the use of the ^ operator to
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load the 16 MSBs of an address or constant for the C4x.
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The generated assembly code requires the GNU assembler (GAS). This is
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not currently included as part of the binutils package, due to the
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many hacks required to be compatible with TI's kludged COFF
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implementation, and the binutils not being designed for 32-bit bytes.
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Patches against binutils-2.7.2 can be obtained from
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ftp://ongaonga.chch.cri.nz/pub/c4x. This site also has patches for
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the GNU debugger (GDB), incoporating a cycle accurate simulator that
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can display profiles and histories of code execution, detailing
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pipeline conflicts etc.
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GCC can be configured as a cross compiler for both the C3x and C4x
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architectures on the same system. Use `configure --target=c4x' to
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configure GCC for both the C3x and C4x. Then use the -m30 option to
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generate code for the C30 or -m40 (the default) for the C40.
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Further installation notes and other optimization patches for GCC can
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also be obtained from ftp://ongaonga.chch.cri.nz/pub/c4x.
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A Majordomo mailing list, gcc_c40@atlantek.com.au, exists to discuss
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related issues and suggestions for further optimizations. To
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subscribe send a message with `subscribe gcc_c40' in the body to
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majordomo@atlantek.com.au.
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Michael Hayes, 16 Sep 98
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