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[Qemu-devel] [PULL 1/5] tcg: Document INDEX_mul[us]h_*
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From: |
Richard Henderson |
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Subject: |
[Qemu-devel] [PULL 1/5] tcg: Document INDEX_mul[us]h_* |
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Date: |
Wed, 2 May 2018 10:47:49 -0700 |
Signed-off-by: Richard Henderson <address@hidden>
---
tcg/README | 8 ++++++++
1 file changed, 8 insertions(+)
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>
--
2.14.3