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[PULL,1/5] tcg: Document INDEX_mul[us]h_*

Message ID 20180502174753.16133-2-richard.henderson@linaro.org
State Accepted
Commit d103021269ca9307ed7ca0d845d2b9e6c387509a
Headers show
Series TCG queued patches | expand

Commit Message

Richard Henderson May 2, 2018, 5:47 p.m. UTC 
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

---
 tcg/README | 8 ++++++++
 1 file changed, 8 insertions(+)

-- 
2.14.3
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Patch

diff --git a/tcg/README b/tcg/README
index bb2ea5121b..a5237a9edb 100644
--- a/tcg/README
+++ b/tcg/README
@@ -431,6 +431,14 @@  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>