160 lines
4.5 KiB
Plaintext
160 lines
4.5 KiB
Plaintext
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This is a patch to solve two problems:
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1. It makes gmp run faster on Intel Core2 CPUs (i.e. Woodcrest, Conroe,
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and friends) under Linux
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2. It makes gmp work (and run fast) under Mac OS X on Core2 CPU
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machines (e.g. Mac Pro)
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As an added bonus, it actually gives a little speed up to gmp on AMD64
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machines as well.
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To Install on a 64 bit Intel Mac (e.g. Mac Pro)
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-------------------------------------------------------
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1. Download gmp-4.2.1-core2-port.tar.gz
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2. Uncompress and untar it. Let's say that it's in the directory
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~/gmp-4.2.1-core2-port
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3. Download GMP version 4.2.1
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4. Uncompress and untar GMP. Let's say that it's in the directory
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~/gmp-4.2.1
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5. Change into the gmp-4.2.1-core2-port directory and run the install
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script (if you want to see what it's doing, just read it... it's a
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very simple script).
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> cd ~/gmp-4.2.1-core2-port
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> ./install_gmp_4.2.1_core2_patch.sh ~/gmp-4.2.1
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6. Configure gmp for a 64 bit Intel Mac as such:
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> cd ~/gmp-4.2.1
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> ./configure --build=x86_64-apple-darwin CFLAGS="-m64 -fast"
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(You can, of course, add whatever other config options you want. Be
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sure to use the CFLAGS environmental variable given above on the
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command line. Otherwise, the CFLAGS setting that configure generates
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by default will give you compilation problems.)
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7. Build it! Execute the following:
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> make
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8. Check it! Execute the following:
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> make check
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9. Install it.
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> sudo make install
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To Install on a Linux machine.
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-------------------------------------------------------
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1. Download gmp-4.2.1-core2-port.tar.gz
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2. Uncompress and untar it. Let's say that it's in the directory
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~/gmp-4.2.1-core2-port
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3. Download GMP version 4.2.1
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4. Uncompress and untar GMP. Let's say that it's in the directory
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~/gmp-4.2.1
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5. Change into the gmp-4.2.1-core2-port directory and run the install
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script (if you want to see what it's doing, just read it... it's a
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very simple script).
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> cd ~/gmp-4.2.1-core2-port
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> ./install_gmp_4.2.1_core2_patch.sh ~/gmp-4.2.1
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6. Configure gmp as normal.
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> cd ~/gmp-4.2.1
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> ./configure
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(You can, of course, add whatever other config options you want.)
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7. Build it! Execute the following:
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> make
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8. Check it! Execute the following:
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> make check
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9. Install it.
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> sudo make install
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NOTES:
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1. Wow! The GMP code base is really well organized! It was very easy
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for me to find out exactly what files needed changing. Nice work guys!!
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2. In amd64call.asm all I changed was to make the addressing relative to
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the rip register rather than absolute. The Apple 64bit ABI doesn't support
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absolute addressing. Since Linux can use either addressing mode, it
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makes sense to use position independent code... it's more portable and
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there's no real performance difference.
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3. In add_n and sub_n I re-wrote the code to accomidate the Woodcrest
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nuances. Mainly, I unrolled the main loop and I got rid of the "inc"
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instruction (which causes a false dependency on the flag register and
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thus stalls the pipeline). Of course, this also meant that I had to
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save the carry flag between loop iterations using the "lahf" and
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"sahf" instructions. These instructions are available on the Mac Pro
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using the Apple assembler, but because some early x86_64 CPUs didn't
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support those instructins, the GNU assembler doesn't allow those
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mnemonics on 64bit machines (even when the CPU will support it). So,
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my assembly code includes some m4 code which calls the shell script
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"lahf_sahf_test.sh" which determines if the lahf and sahf instructions
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are available on the CPU. If so, then it includes some hand assembled
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bytes to get around GNU as limitations. Otherwise, it falls back to
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using "setc" and "bt" which are slower.
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4. On my 2.66 GHz Mac Pro, I was able to get a GMPbench score of 8263.
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5. You'll notice a Makefile and a bunch of extraneous files. These are
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used for testing the code outside of the GMP source tree. The Makefile
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will produce a file called mpn_test which just runs the routines through
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a bunch of speed and correctness tests and compares them against the
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original GMP 4.2.1 assembly files.
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6. On Mac OS X I haven't found a nice way yet to build dynamic
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libraries. The biggest obstical is that the Apple "libtool" and the
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GNU "libtool" have incompatible syntax. My guess is that in the near
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future the GNU libtool will support the Apple libtool for creating
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dynamic shared libraries. For the mean time, I'll be content with
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static libraries. If you find a simple solution please let me know.
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Jason Worth Martin
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Asst. Prof. of Mathematics
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James Madison Univ.
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martinjw@jmu.edu
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