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tcg: Document INDEX_mul[us]h_*

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Backports commit d103021269ca9307ed7ca0d845d2b9e6c387509a from qemu
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Richard Henderson 2018-05-03 14:40:39 -04:00 committed by Lioncash
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8
qemu/tcg/README
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@ -426,6 +426,14 @@ double-word product T0. The later is returned in two single-word outputs.
Similar to mulu2, except the two inputs T1 and T2 are signed.
* mulsh_i32/i64 t0, t1, t2
* muluh_i32/i64 t0, t1, t2
Provide the high part of a signed or unsigned multiply, respectively.
If mulu2/muls2 are not provided by the backend, the tcg-op generator
can obtain the same results can be obtained by emitting a pair of
opcodes, mul+muluh/mulsh.
********* Memory Barrier support
* mb <$arg>