COP1: Difference between revisions
→Full Mode vs Half Mode
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If multiple bits are set, the conditions are ORed together: For example, UEQ is considered true if the two operands are equal or unordered.
{| class="wikitable"
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! SignalOnSNAN (Bit 3) !! Smaller (Bit 2) || Equal (Bit 1) || Unordered (Bit 0) || Name || Result formula || Invalid Operation Condition
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| 0 || 0 || 0 || 0 || F || Result = false || IsQNAN(arg1) OR isQNAN
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| 0 || 0 || 0 || 1 || UN || Result = unordered(arg1, arg2) || IsQNAN(arg1) OR isQNAN
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| 0 || 0 || 1 || 0 || EQ || Result = arg1 == arg2 || IsQNAN(arg1) OR isQNAN
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| 0 || 0 || 1 || 1 || UEQ || Result = unordered(arg1, arg2) OR (arg1 == arg2) || IsQNAN(arg1) OR isQNAN
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| 0 || 1 || 0 || 0 || OLT || Result = arg1 < arg2 || IsQNAN(arg1) OR isQNAN
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| 0 || 1 || 0 || 1 || ULT || Result = unordered(arg1, arg2) OR (arg1 < arg2) || IsQNAN(arg1) OR isQNAN
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| 0 || 1 || 1 || 0 || OLE || Result = arg1 <= arg2 || IsQNAN(arg1) OR isQNAN
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| 0 || 1 || 1 || 1 || ULE || Result = unordered(arg1, arg2) OR (arg1 <= arg2) || IsQNAN(arg1) OR isQNAN
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| 1 || 0 || 0 || 0 || SF || Result = false || IsNAN(arg1) OR isNAN
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| 1 || 0 || 0 || 1 || NGLE || Result = unordered(arg1, arg2) || IsNAN(arg1) OR isNAN
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| 1 || 0 || 1 || 0 || SEQ || Result = arg1 == arg2 || IsNAN(arg1) OR isNAN
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| 1 || 0 || 1 || 1 || NGL || Result = unordered(arg1, arg2) OR (arg1 == arg2) || IsNAN(arg1) OR isNAN
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| 1 || 1 || 0 || 0 || LT || Result = arg1 < arg2 || IsNAN(arg1) OR isNAN
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| 1 || 1 || 0 || 1 || NGE || Result = unordered(arg1, arg2) OR (arg1 < arg2) || IsNAN(arg1) OR isNAN
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| 1 || 1 || 1 || 0 || LE || Result = arg1 <= arg2 || IsNAN(arg1) OR isNAN
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| 1 || 1 || 1 || 1 || NGT || Result = unordered(arg1, arg2) OR (arg1 <= arg2) || IsNAN(arg1) OR isNAN
|}
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|+ Illegal register indexing in "Half Mode" (normally undocumented behavior - do not use)
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!
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| 0 || 1 (high 32 bits) / 0 (low 32 bits) || 0 (low 32 bits) || 0 or 1
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| 1 || unused || 1 (low 32 bits) || unused
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| 2 || 3 (high 32 bits) / 2 (low 32 bits) || 2 (low 32 bits) ||
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| 3 || unused || 3 (low 32 bits) || unused
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| 4 || 5 (high 32 bits) / 4 (low 32 bits) || 4 (low 32 bits) ||
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| 5 || unused || 5 (low 32 bits) || unused
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