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target/arm: Implement MVE shift-by-scalar

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Implement the MVE instructions which perform shifts by a scalar.
These are VSHL T2, VRSHL T2, VQSHL T1 and VQRSHL T2.  They take the
shift amount in a general purpose register and shift every element in
the vector by that amount.

Mostly we can reuse the helper functions for shift-by-immediate; we
do need two new helpers for VQRSHL.

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 17:11:52 +01:00
parent 6b895bf8fb
commit 1b15a97d4c
4 changed files with 76 additions and 3 deletions
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2
target/arm/mve_helper.c
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@ -1334,6 +1334,8 @@ DO_2SHIFT_SAT_S(vqshli_s, DO_SQSHL_OP)
DO_2SHIFT_SAT_S(vqshlui_s, DO_SUQSHL_OP)
DO_2SHIFT_U(vrshli_u, DO_VRSHLU)
DO_2SHIFT_S(vrshli_s, DO_VRSHLS)
DO_2SHIFT_SAT_U(vqrshli_u, DO_UQRSHL_OP)
DO_2SHIFT_SAT_S(vqrshli_s, DO_SQRSHL_OP)
/* Shift-and-insert; we always work with 64 bits at a time */
#define DO_2SHIFT_INSERT(OP, ESIZE, SHIFTFN, MASKFN) \