tcg: document double-word support opcodes.
The internal opcodes brcond2, add2, sub2, mulu2 were undocumented. Place these in a new section that clearly indicates that they are not to be emitted by translators. Signed-off-by: Richard Henderson <rth@twiddle.net> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
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@ -323,6 +323,29 @@ st32_i64 t0, t1, offset
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write(t0, t1 + offset)
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write(t0, t1 + offset)
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Write 8, 16, 32 or 64 bits to host memory.
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Write 8, 16, 32 or 64 bits to host memory.
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********* 64-bit target on 32-bit host support
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The following opcodes are internal to TCG. Thus they are to be implemented by
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32-bit host code generators, but are not to be emitted by guest translators.
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They are emitted as needed by inline functions within "tcg-op.h".
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* brcond2_i32 cond, t0_low, t0_high, t1_low, t1_high, label
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Similar to brcond, except that the 64-bit values T0 and T1
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are formed from two 32-bit arguments.
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* add2_i32 t0_low, t0_high, t1_low, t1_high, t2_low, t2_high
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* sub2_i32 t0_low, t0_high, t1_low, t1_high, t2_low, t2_high
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Similar to add/sub, except that the 64-bit inputs T1 and T2 are
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formed from two 32-bit arguments, and the 64-bit output T0
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is returned in two 32-bit outputs.
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* mulu2_i32 t0_low, t0_high, t1, t2
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Similar to mul, except two 32-bit (unsigned) inputs T1 and T2 yielding
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the full 64-bit product T0. The later is returned in two 32-bit outputs.
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********* QEMU specific operations
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********* QEMU specific operations
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* tb_exit t0
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* tb_exit t0
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