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target/arm: Implement MVE VADDLV

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Implement the MVE VADDLV insn; this is similar to VADDV, except
that it accumulates 32-bit elements into a 64-bit accumulator
stored in a pair of general-purpose registers.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20210628135835.6690-15-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2021-06-28 14:58:31 +01:00
parent 2e6a4ce0f6
commit d43ebd9dc8
4 changed files with 90 additions and 1 deletions
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3
target/arm/helper-mve.h
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@ -356,6 +356,9 @@ DEF_HELPER_FLAGS_3(mve_vaddvuh, TCG_CALL_NO_WG, i32, env, ptr, i32)
DEF_HELPER_FLAGS_3(mve_vaddvsw, TCG_CALL_NO_WG, i32, env, ptr, i32)
DEF_HELPER_FLAGS_3(mve_vaddvuw, TCG_CALL_NO_WG, i32, env, ptr, i32)
DEF_HELPER_FLAGS_3(mve_vaddlv_s, TCG_CALL_NO_WG, i64, env, ptr, i64)
DEF_HELPER_FLAGS_3(mve_vaddlv_u, TCG_CALL_NO_WG, i64, env, ptr, i64)
DEF_HELPER_FLAGS_3(mve_vmovi, TCG_CALL_NO_WG, void, env, ptr, i64)
DEF_HELPER_FLAGS_3(mve_vandi, TCG_CALL_NO_WG, void, env, ptr, i64)
DEF_HELPER_FLAGS_3(mve_vorri, TCG_CALL_NO_WG, void, env, ptr, i64)

6
target/arm/mve.decode
View File

@ -307,7 +307,11 @@ VQDMULH_scalar 1110 1110 0 . .. ... 1 ... 0 1110 . 110 .... @2scalar
VQRDMULH_scalar 1111 1110 0 . .. ... 1 ... 0 1110 . 110 .... @2scalar
# Vector add across vector
VADDV 111 u:1 1110 1111 size:2 01 ... 0 1111 0 0 a:1 0 qm:3 0 rda=%rdalo
{
VADDV 111 u:1 1110 1111 size:2 01 ... 0 1111 0 0 a:1 0 qm:3 0 rda=%rdalo
VADDLV 111 u:1 1110 1 ... 1001 ... 0 1111 00 a:1 0 qm:3 0 \
rdahi=%rdahi rdalo=%rdalo
}
# Predicate operations
%mask_22_13 22:1 13:3

19
target/arm/mve_helper.c
View File

@ -1189,6 +1189,25 @@ DO_VADDV(vaddvub, 1, uint8_t)
DO_VADDV(vaddvuh, 2, uint16_t)
DO_VADDV(vaddvuw, 4, uint32_t)
#define DO_VADDLV(OP, TYPE, LTYPE) \
uint64_t HELPER(glue(mve_, OP))(CPUARMState *env, void *vm, \
uint64_t ra) \
{ \
uint16_t mask = mve_element_mask(env); \
unsigned e; \
TYPE *m = vm; \
for (e = 0; e < 16 / 4; e++, mask >>= 4) { \
if (mask & 1) { \
ra += (LTYPE)m[H4(e)]; \
} \
} \
mve_advance_vpt(env); \
return ra; \
} \
DO_VADDLV(vaddlv_s, int32_t, int64_t)
DO_VADDLV(vaddlv_u, uint32_t, uint64_t)
/* Shifts by immediate */
#define DO_2SHIFT(OP, ESIZE, TYPE, FN) \
void HELPER(glue(mve_, OP))(CPUARMState *env, void *vd, \

63
target/arm/translate-mve.c
View File

@ -790,6 +790,69 @@ static bool trans_VADDV(DisasContext *s, arg_VADDV *a)
return true;
}
static bool trans_VADDLV(DisasContext *s, arg_VADDLV *a)
{
/*
* Vector Add Long Across Vector: accumulate the 32-bit
* elements of the vector into a 64-bit result stored in
* a pair of general-purpose registers.
* No need to check Qm's bank: it is only 3 bits in decode.
*/
TCGv_ptr qm;
TCGv_i64 rda;
TCGv_i32 rdalo, rdahi;
if (!dc_isar_feature(aa32_mve, s)) {
return false;
}
/*
* rdahi == 13 is UNPREDICTABLE; rdahi == 15 is a related
* encoding; rdalo always has bit 0 clear so cannot be 13 or 15.
*/
if (a->rdahi == 13 || a->rdahi == 15) {
return false;
}
if (!mve_eci_check(s) || !vfp_access_check(s)) {
return true;
}
/*
* This insn is subject to beat-wise execution. Partial execution
* of an A=0 (no-accumulate) insn which does not execute the first
* beat must start with the current value of RdaHi:RdaLo, not zero.
*/
if (a->a || mve_skip_first_beat(s)) {
/* Accumulate input from RdaHi:RdaLo */
rda = tcg_temp_new_i64();
rdalo = load_reg(s, a->rdalo);
rdahi = load_reg(s, a->rdahi);
tcg_gen_concat_i32_i64(rda, rdalo, rdahi);
tcg_temp_free_i32(rdalo);
tcg_temp_free_i32(rdahi);
} else {
/* Accumulate starting at zero */
rda = tcg_const_i64(0);
}
qm = mve_qreg_ptr(a->qm);
if (a->u) {
gen_helper_mve_vaddlv_u(rda, cpu_env, qm, rda);
} else {
gen_helper_mve_vaddlv_s(rda, cpu_env, qm, rda);
}
tcg_temp_free_ptr(qm);
rdalo = tcg_temp_new_i32();
rdahi = tcg_temp_new_i32();
tcg_gen_extrl_i64_i32(rdalo, rda);
tcg_gen_extrh_i64_i32(rdahi, rda);
store_reg(s, a->rdalo, rdalo);
store_reg(s, a->rdahi, rdahi);
tcg_temp_free_i64(rda);
mve_update_eci(s);
return true;
}
static bool do_1imm(DisasContext *s, arg_1imm *a, MVEGenOneOpImmFn *fn)
{
TCGv_ptr qd;