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https://github.com/c64scene-ar/llvm-6502.git
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7a2bdde0a0
Luis Felipe Strano Moraes! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129558 91177308-0d34-0410-b5e6-96231b3b80d8
43 lines
1023 B
Plaintext
43 lines
1023 B
Plaintext
***
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add gcc builtins for alpha instructions
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***
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custom expand byteswap into nifty
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extract/insert/mask byte/word/longword/quadword low/high
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sequences
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***
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see if any of the extract/insert/mask operations can be added
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***
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match more interesting things for cmovlbc cmovlbs (move if low bit clear/set)
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***
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lower srem and urem
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remq(i,j): i - (j * divq(i,j)) if j != 0
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remqu(i,j): i - (j * divqu(i,j)) if j != 0
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reml(i,j): i - (j * divl(i,j)) if j != 0
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remlu(i,j): i - (j * divlu(i,j)) if j != 0
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***
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add crazy vector instructions (MVI):
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(MIN|MAX)(U|S)(B8|W4) min and max, signed and unsigned, byte and word
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PKWB, UNPKBW pack/unpack word to byte
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PKLB UNPKBL pack/unpack long to byte
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PERR pixel error (sum across bytes of bytewise abs(i8v8 a - i8v8 b))
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cmpbytes bytewise cmpeq of i8v8 a and i8v8 b (not part of MVI extensions)
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this has some good examples for other operations that can be synthesised well
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from these rather meager vector ops (such as saturating add).
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http://www.alphalinux.org/docs/MVI-full.html
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