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target/arm: Note that we handle VMOVL as a special case of VSHLL

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Although the architecture doesn't define it as an alias, VMOVL
(vector move long) is encoded as a VSHLL with a zero shift.
Add a comment in the decode file noting that we handle VMOVL
as part of VSHLL.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Peter Maydell 2021-08-13 17:11:46 +01:00
parent d426857656
commit 9dacf0764b
1 changed files with 2 additions and 0 deletions
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target/arm/mve.decode
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@ -364,6 +364,8 @@ VRSHRI_U 111 1 1111 1 . ... ... ... 0 0010 0 1 . 1 ... 0 @2_shr_h
VRSHRI_U 111 1 1111 1 . ... ... ... 0 0010 0 1 . 1 ... 0 @2_shr_w
# VSHLL T1 encoding; the T2 VSHLL encoding is elsewhere in this file
# Note that VMOVL is encoded as "VSHLL with a zero shift count"; we
# implement it that way rather than special-casing it in the decode.
VSHLL_BS 111 0 1110 1 . 1 .. ... ... 0 1111 0 1 . 0 ... 0 @2_shll_b
VSHLL_BS 111 0 1110 1 . 1 .. ... ... 0 1111 0 1 . 0 ... 0 @2_shll_h