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Diffstat (limited to 'lib/Target/Alpha/README.txt')
| -rw-r--r-- | lib/Target/Alpha/README.txt | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/lib/Target/Alpha/README.txt b/lib/Target/Alpha/README.txt new file mode 100644 index 000000000000..9ae15174c582 --- /dev/null +++ b/lib/Target/Alpha/README.txt @@ -0,0 +1,42 @@ +*** + +add gcc builtins for alpha instructions + + +*** + +custom expand byteswap into nifty +extract/insert/mask byte/word/longword/quadword low/high +sequences + +*** + +see if any of the extract/insert/mask operations can be added + +*** + +match more interesting things for cmovlbc cmovlbs (move if low bit clear/set) + +*** + +lower srem and urem + +remq(i,j): i - (j * divq(i,j)) if j != 0 +remqu(i,j): i - (j * divqu(i,j)) if j != 0 +reml(i,j): i - (j * divl(i,j)) if j != 0 +remlu(i,j): i - (j * divlu(i,j)) if j != 0 + +*** + +add crazy vector instructions (MVI): + +(MIN|MAX)(U|S)(B8|W4) min and max, signed and unsigned, byte and word +PKWB, UNPKBW pack/unpack word to byte +PKLB UNPKBL pack/unpack long to byte +PERR pixel error (sum accross bytes of bytewise abs(i8v8 a - i8v8 b)) + +cmpbytes bytewise cmpeq of i8v8 a and i8v8 b (not part of MVI extentions) + +this has some good examples for other operations that can be synthesised well +from these rather meager vector ops (such as saturating add). +http://www.alphalinux.org/docs/MVI-full.html |