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target/arm: Optimize MVE VSHL, VSHR immediate forms

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Optimize the MVE VSHL and VSHR immediate forms by using TCG vector
ops when possible.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20210913095440.13462-10-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2021-09-13 10:54:37 +01:00
parent 5cf525a8a6
commit 752970ef7c
1 changed files with 63 additions and 20 deletions
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57
target/arm/translate-mve.c
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@ -1570,8 +1570,8 @@ static bool trans_Vimm_1r(DisasContext *s, arg_1imm *a)
return do_1imm(s, a, fn);
}
static bool do_2shift(DisasContext *s, arg_2shift *a, MVEGenTwoOpShiftFn fn,
bool negateshift)
static bool do_2shift_vec(DisasContext *s, arg_2shift *a, MVEGenTwoOpShiftFn fn,
bool negateshift, GVecGen2iFn vecfn)
{
TCGv_ptr qd, qm;
int shift = a->shift;
@ -1594,16 +1594,27 @@ static bool do_2shift(DisasContext *s, arg_2shift *a, MVEGenTwoOpShiftFn fn,
shift = -shift;
}
if (vecfn && mve_no_predication(s)) {
vecfn(a->size, mve_qreg_offset(a->qd), mve_qreg_offset(a->qm),
shift, 16, 16);
} else {
qd = mve_qreg_ptr(a->qd);
qm = mve_qreg_ptr(a->qm);
fn(cpu_env, qd, qm, tcg_constant_i32(shift));
tcg_temp_free_ptr(qd);
tcg_temp_free_ptr(qm);
}
mve_update_eci(s);
return true;
}
#define DO_2SHIFT(INSN, FN, NEGATESHIFT) \
static bool do_2shift(DisasContext *s, arg_2shift *a, MVEGenTwoOpShiftFn fn,
bool negateshift)
{
return do_2shift_vec(s, a, fn, negateshift, NULL);
}
#define DO_2SHIFT_VEC(INSN, FN, NEGATESHIFT, VECFN) \
static bool trans_##INSN(DisasContext *s, arg_2shift *a) \
{ \
static MVEGenTwoOpShiftFn * const fns[] = { \
@ -1612,16 +1623,48 @@ static bool do_2shift(DisasContext *s, arg_2shift *a, MVEGenTwoOpShiftFn fn,
gen_helper_mve_##FN##w, \
NULL, \
}; \
return do_2shift(s, a, fns[a->size], NEGATESHIFT); \
return do_2shift_vec(s, a, fns[a->size], NEGATESHIFT, VECFN); \
}
DO_2SHIFT(VSHLI, vshli_u, false)
#define DO_2SHIFT(INSN, FN, NEGATESHIFT) \
DO_2SHIFT_VEC(INSN, FN, NEGATESHIFT, NULL)
static void do_gvec_shri_s(unsigned vece, uint32_t dofs, uint32_t aofs,
int64_t shift, uint32_t oprsz, uint32_t maxsz)
{
/*
* We get here with a negated shift count, and we must handle
* shifts by the element size, which tcg_gen_gvec_sari() does not do.
*/
shift = -shift;
if (shift == (8 << vece)) {
shift--;
}
tcg_gen_gvec_sari(vece, dofs, aofs, shift, oprsz, maxsz);
}
static void do_gvec_shri_u(unsigned vece, uint32_t dofs, uint32_t aofs,
int64_t shift, uint32_t oprsz, uint32_t maxsz)
{
/*
* We get here with a negated shift count, and we must handle
* shifts by the element size, which tcg_gen_gvec_shri() does not do.
*/
shift = -shift;
if (shift == (8 << vece)) {
tcg_gen_gvec_dup_imm(vece, dofs, oprsz, maxsz, 0);
} else {
tcg_gen_gvec_shri(vece, dofs, aofs, shift, oprsz, maxsz);
}
}
DO_2SHIFT_VEC(VSHLI, vshli_u, false, tcg_gen_gvec_shli)
DO_2SHIFT(VQSHLI_S, vqshli_s, false)
DO_2SHIFT(VQSHLI_U, vqshli_u, false)
DO_2SHIFT(VQSHLUI, vqshlui_s, false)
/* These right shifts use a left-shift helper with negated shift count */
DO_2SHIFT(VSHRI_S, vshli_s, true)
DO_2SHIFT(VSHRI_U, vshli_u, true)
DO_2SHIFT_VEC(VSHRI_S, vshli_s, true, do_gvec_shri_s)
DO_2SHIFT_VEC(VSHRI_U, vshli_u, true, do_gvec_shri_u)
DO_2SHIFT(VRSHRI_S, vrshli_s, true)
DO_2SHIFT(VRSHRI_U, vrshli_u, true)