Revision b7767f0f tcg/README

b/tcg/README
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Indicate that the value of t0 won't be used later. It is useful to
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force dead code elimination.
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* deposit_i32/i64 dest, t1, t2, pos, loc
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Deposit T2 as a bitfield into T1, placing the result in DEST.
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The bitfield is described by POS/LOC, which are immediate values:
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  LEN - the length of the bitfield
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  POS - the position of the first bit, counting from the LSB
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For example, pos=8, len=4 indicates a 4-bit field at bit 8.
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This operation would be equivalent to
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  dest = (t1 & ~0x0f00) | ((t2 << 8) & 0x0f00)
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********* Conditional moves
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* setcond_i32/i64 cond, dest, t1, t2

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