forked from MeloNX/MeloNX
ff53dcf560
* dotnet format style --severity info Some changes were manually reverted. * dotnet format analyzers --serverity info Some changes have been minimally adapted. * Restore a few unused methods and variables * Silence dotnet format IDE0060 warnings * Silence dotnet format IDE0052 warnings * Address or silence dotnet format IDE1006 warnings * Address or silence dotnet format CA2208 warnings * Address dotnet format CA1822 warnings * Address or silence dotnet format CA1069 warnings * Silence CA1806 and CA1834 issues * Address dotnet format CA1401 warnings * Fix new dotnet-format issues after rebase * Address review comments * Address dotnet format CA2208 warnings properly * Fix formatting for switch expressions * Address most dotnet format whitespace warnings * Apply dotnet format whitespace formatting A few of them have been manually reverted and the corresponding warning was silenced * Add previously silenced warnings back I have no clue how these disappeared * Revert formatting changes for OpCodeTable.cs * Enable formatting for a few cases again * Format if-blocks correctly * Enable formatting for a few more cases again * Fix inline comment alignment * Run dotnet format after rebase and remove unused usings - analyzers - style - whitespace * Disable 'prefer switch expression' rule * Add comments to disabled warnings * Remove a few unused parameters * Adjust namespaces * Simplify properties and array initialization, Use const when possible, Remove trailing commas * Start working on disabled warnings * Fix and silence a few dotnet-format warnings again * Address IDE0251 warnings * Address a few disabled IDE0060 warnings * Silence IDE0060 in .editorconfig * Revert "Simplify properties and array initialization, Use const when possible, Remove trailing commas" This reverts commit 9462e4136c0a2100dc28b20cf9542e06790aa67e. * dotnet format whitespace after rebase * First dotnet format pass * Remove unnecessary formatting exclusion * Add unsafe dotnet format changes * Change visibility of JitSupportDarwin to internal
92 lines
2.9 KiB
C#
92 lines
2.9 KiB
C#
namespace ARMeilleure.Decoders
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{
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public static class OpCodeSimdHelper
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{
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public static (long Immediate, int Size) GetSimdImmediateAndSize(int cMode, int op, long imm)
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{
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int modeLow = cMode & 1;
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int modeHigh = cMode >> 1;
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int size = 0;
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if (modeHigh == 0b111)
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{
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switch (op | (modeLow << 1))
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{
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case 0:
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// 64-bits Immediate.
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// Transform abcd efgh into abcd efgh abcd efgh ...
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size = 3;
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imm = (long)((ulong)imm * 0x0101010101010101);
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break;
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case 1:
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// 64-bits Immediate.
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// Transform abcd efgh into aaaa aaaa bbbb bbbb ...
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size = 3;
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imm = (imm & 0xf0) >> 4 | (imm & 0x0f) << 4;
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imm = (imm & 0xcc) >> 2 | (imm & 0x33) << 2;
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imm = (imm & 0xaa) >> 1 | (imm & 0x55) << 1;
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imm = (long)((ulong)imm * 0x8040201008040201);
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imm = (long)((ulong)imm & 0x8080808080808080);
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imm |= imm >> 4;
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imm |= imm >> 2;
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imm |= imm >> 1;
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break;
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case 2:
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// 2 x 32-bits floating point Immediate.
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size = 3;
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imm = (long)DecoderHelper.Imm8ToFP32Table[(int)imm];
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imm |= imm << 32;
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break;
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case 3:
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// 64-bits floating point Immediate.
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size = 3;
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imm = (long)DecoderHelper.Imm8ToFP64Table[(int)imm];
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break;
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}
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}
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else if ((modeHigh & 0b110) == 0b100)
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{
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// 16-bits shifted Immediate.
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size = 1;
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imm <<= (modeHigh & 1) << 3;
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}
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else if ((modeHigh & 0b100) == 0b000)
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{
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// 32-bits shifted Immediate.
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size = 2;
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imm <<= modeHigh << 3;
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}
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else if ((modeHigh & 0b111) == 0b110)
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{
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// 32-bits shifted Immediate (fill with ones).
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size = 2;
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imm = ShlOnes(imm, 8 << modeLow);
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}
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else
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{
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// 8-bits without shift.
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size = 0;
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}
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return (imm, size);
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}
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private static long ShlOnes(long value, int shift)
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{
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if (shift != 0)
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{
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return value << shift | (long)(ulong.MaxValue >> (64 - shift));
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}
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else
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{
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return value;
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}
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}
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}
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}
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