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target/arm: Implement MVE VBRSR

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Implement the MVE VBRSR insn, which reverses a specified
number of bits in each element, setting the rest to zero.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20210617121628.20116-26-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2021-06-17 13:16:09 +01:00
parent 644f717c35
commit b050543b68
4 changed files with 49 additions and 0 deletions
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43
target/arm/mve_helper.c
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@ -523,6 +523,49 @@ DO_2OP_SCALAR_U(vhaddu_scalar, do_vhadd_u)
DO_2OP_SCALAR_S(vhsubs_scalar, do_vhsub_s)
DO_2OP_SCALAR_U(vhsubu_scalar, do_vhsub_u)
static inline uint32_t do_vbrsrb(uint32_t n, uint32_t m)
{
m &= 0xff;
if (m == 0) {
return 0;
}
n = revbit8(n);
if (m < 8) {
n >>= 8 - m;
}
return n;
}
static inline uint32_t do_vbrsrh(uint32_t n, uint32_t m)
{
m &= 0xff;
if (m == 0) {
return 0;
}
n = revbit16(n);
if (m < 16) {
n >>= 16 - m;
}
return n;
}
static inline uint32_t do_vbrsrw(uint32_t n, uint32_t m)
{
m &= 0xff;
if (m == 0) {
return 0;
}
n = revbit32(n);
if (m < 32) {
n >>= 32 - m;
}
return n;
}
DO_2OP_SCALAR(vbrsrb, 1, uint8_t, do_vbrsrb)
DO_2OP_SCALAR(vbrsrh, 2, uint16_t, do_vbrsrh)
DO_2OP_SCALAR(vbrsrw, 4, uint32_t, do_vbrsrw)
/*
* Multiply add long dual accumulate ops.
*/