aboutsummaryrefslogtreecommitdiff
path: root/ARMeilleure/Decoders/OpCodeSimdHelper.cs
diff options
context:
space:
mode:
authorTSR Berry <20988865+TSRBerry@users.noreply.github.com>2023-04-08 01:22:00 +0200
committerMary <thog@protonmail.com>2023-04-27 23:51:14 +0200
commitcee712105850ac3385cd0091a923438167433f9f (patch)
tree4a5274b21d8b7f938c0d0ce18736d3f2993b11b1 /ARMeilleure/Decoders/OpCodeSimdHelper.cs
parentcd124bda587ef09668a971fa1cac1c3f0cfc9f21 (diff)
Move solution and projects to src
Diffstat (limited to 'ARMeilleure/Decoders/OpCodeSimdHelper.cs')
-rw-r--r--ARMeilleure/Decoders/OpCodeSimdHelper.cs88
1 files changed, 0 insertions, 88 deletions
diff --git a/ARMeilleure/Decoders/OpCodeSimdHelper.cs b/ARMeilleure/Decoders/OpCodeSimdHelper.cs
deleted file mode 100644
index 02f74d03..00000000
--- a/ARMeilleure/Decoders/OpCodeSimdHelper.cs
+++ /dev/null
@@ -1,88 +0,0 @@
-namespace ARMeilleure.Decoders
-{
- public static class OpCodeSimdHelper
- {
- public static (long Immediate, int Size) GetSimdImmediateAndSize(int cMode, int op, long imm)
- {
- int modeLow = cMode & 1;
- int modeHigh = cMode >> 1;
- int size = 0;
-
- if (modeHigh == 0b111)
- {
- switch (op | (modeLow << 1))
- {
- case 0:
- // 64-bits Immediate.
- // Transform abcd efgh into abcd efgh abcd efgh ...
- size = 3;
- imm = (long)((ulong)imm * 0x0101010101010101);
- break;
-
- case 1:
- // 64-bits Immediate.
- // Transform abcd efgh into aaaa aaaa bbbb bbbb ...
- size = 3;
- imm = (imm & 0xf0) >> 4 | (imm & 0x0f) << 4;
- imm = (imm & 0xcc) >> 2 | (imm & 0x33) << 2;
- imm = (imm & 0xaa) >> 1 | (imm & 0x55) << 1;
-
- imm = (long)((ulong)imm * 0x8040201008040201);
- imm = (long)((ulong)imm & 0x8080808080808080);
-
- imm |= imm >> 4;
- imm |= imm >> 2;
- imm |= imm >> 1;
- break;
-
- case 2:
- // 2 x 32-bits floating point Immediate.
- size = 3;
- imm = (long)DecoderHelper.Imm8ToFP32Table[(int)imm];
- imm |= imm << 32;
- break;
-
- case 3:
- // 64-bits floating point Immediate.
- size = 3;
- imm = (long)DecoderHelper.Imm8ToFP64Table[(int)imm];
- break;
- }
- }
- else if ((modeHigh & 0b110) == 0b100)
- {
- // 16-bits shifted Immediate.
- size = 1; imm <<= (modeHigh & 1) << 3;
- }
- else if ((modeHigh & 0b100) == 0b000)
- {
- // 32-bits shifted Immediate.
- size = 2; imm <<= modeHigh << 3;
- }
- else if ((modeHigh & 0b111) == 0b110)
- {
- // 32-bits shifted Immediate (fill with ones).
- size = 2; imm = ShlOnes(imm, 8 << modeLow);
- }
- else
- {
- // 8-bits without shift.
- size = 0;
- }
-
- return (imm, size);
- }
-
- private static long ShlOnes(long value, int shift)
- {
- if (shift != 0)
- {
- return value << shift | (long)(ulong.MaxValue >> (64 - shift));
- }
- else
- {
- return value;
- }
- }
- }
-}