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target/arm: Implement MVE VQADD and VQSUB 

Implement the MVE VQADD and VQSUB insns, which perform saturating
addition of a scalar to each element.  Note that individual bytes of
each result element are used or discarded according to the predicate
mask, but FPSCR.QC is only set if the predicate mask for the lowest
byte of the element is set.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20210617121628.20116-28-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2021-06-17 13:16:11 +01:00
parent 387debdb93
commit 39f2ec8592
4 changed files with 87 additions and 0 deletions
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16
target/arm/helper-mve.h
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@ -173,6 +173,22 @@ DEF_HELPER_FLAGS_4(mve_vhsubu_scalarb, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
DEF_HELPER_FLAGS_4(mve_vhsubu_scalarh, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
DEF_HELPER_FLAGS_4(mve_vhsubu_scalarw, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
DEF_HELPER_FLAGS_4(mve_vqadds_scalarb, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
DEF_HELPER_FLAGS_4(mve_vqadds_scalarh, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
DEF_HELPER_FLAGS_4(mve_vqadds_scalarw, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
DEF_HELPER_FLAGS_4(mve_vqaddu_scalarb, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
DEF_HELPER_FLAGS_4(mve_vqaddu_scalarh, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
DEF_HELPER_FLAGS_4(mve_vqaddu_scalarw, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
DEF_HELPER_FLAGS_4(mve_vqsubs_scalarb, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
DEF_HELPER_FLAGS_4(mve_vqsubs_scalarh, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
DEF_HELPER_FLAGS_4(mve_vqsubs_scalarw, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
DEF_HELPER_FLAGS_4(mve_vqsubu_scalarb, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
DEF_HELPER_FLAGS_4(mve_vqsubu_scalarh, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
DEF_HELPER_FLAGS_4(mve_vqsubu_scalarw, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
DEF_HELPER_FLAGS_4(mve_vbrsrb, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
DEF_HELPER_FLAGS_4(mve_vbrsrh, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
DEF_HELPER_FLAGS_4(mve_vbrsrw, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)

5
target/arm/mve.decode
View File

@ -167,6 +167,11 @@ VHADD_S_scalar 1110 1110 0 . .. ... 0 ... 0 1111 . 100 .... @2scalar
VHADD_U_scalar 1111 1110 0 . .. ... 0 ... 0 1111 . 100 .... @2scalar
VHSUB_S_scalar 1110 1110 0 . .. ... 0 ... 1 1111 . 100 .... @2scalar
VHSUB_U_scalar 1111 1110 0 . .. ... 0 ... 1 1111 . 100 .... @2scalar
VQADD_S_scalar 1110 1110 0 . .. ... 0 ... 0 1111 . 110 .... @2scalar
VQADD_U_scalar 1111 1110 0 . .. ... 0 ... 0 1111 . 110 .... @2scalar
VQSUB_S_scalar 1110 1110 0 . .. ... 0 ... 1 1111 . 110 .... @2scalar
VQSUB_U_scalar 1111 1110 0 . .. ... 0 ... 1 1111 . 110 .... @2scalar
VBRSR 1111 1110 0 . .. ... 1 ... 1 1110 . 110 .... @2scalar
# Predicate operations

62
target/arm/mve_helper.c
View File

@ -490,6 +490,33 @@ DO_2OP_U(vhaddu, do_vhadd_u)
DO_2OP_S(vhsubs, do_vhsub_s)
DO_2OP_U(vhsubu, do_vhsub_u)
static inline int32_t do_sat_bhw(int64_t val, int64_t min, int64_t max, bool *s)
{
if (val > max) {
*s = true;
return max;
} else if (val < min) {
*s = true;
return min;
}
return val;
}
#define DO_SQADD_B(n, m, s) do_sat_bhw((int64_t)n + m, INT8_MIN, INT8_MAX, s)
#define DO_SQADD_H(n, m, s) do_sat_bhw((int64_t)n + m, INT16_MIN, INT16_MAX, s)
#define DO_SQADD_W(n, m, s) do_sat_bhw((int64_t)n + m, INT32_MIN, INT32_MAX, s)
#define DO_UQADD_B(n, m, s) do_sat_bhw((int64_t)n + m, 0, UINT8_MAX, s)
#define DO_UQADD_H(n, m, s) do_sat_bhw((int64_t)n + m, 0, UINT16_MAX, s)
#define DO_UQADD_W(n, m, s) do_sat_bhw((int64_t)n + m, 0, UINT32_MAX, s)
#define DO_SQSUB_B(n, m, s) do_sat_bhw((int64_t)n - m, INT8_MIN, INT8_MAX, s)
#define DO_SQSUB_H(n, m, s) do_sat_bhw((int64_t)n - m, INT16_MIN, INT16_MAX, s)
#define DO_SQSUB_W(n, m, s) do_sat_bhw((int64_t)n - m, INT32_MIN, INT32_MAX, s)
#define DO_UQSUB_B(n, m, s) do_sat_bhw((int64_t)n - m, 0, UINT8_MAX, s)
#define DO_UQSUB_H(n, m, s) do_sat_bhw((int64_t)n - m, 0, UINT16_MAX, s)
#define DO_UQSUB_W(n, m, s) do_sat_bhw((int64_t)n - m, 0, UINT32_MAX, s)
#define DO_2OP_SCALAR(OP, ESIZE, TYPE, FN) \
void HELPER(glue(mve_, OP))(CPUARMState *env, void *vd, void *vn, \
@ -505,6 +532,27 @@ DO_2OP_U(vhsubu, do_vhsub_u)
mve_advance_vpt(env); \
}
#define DO_2OP_SAT_SCALAR(OP, ESIZE, TYPE, FN) \
void HELPER(glue(mve_, OP))(CPUARMState *env, void *vd, void *vn, \
uint32_t rm) \
{ \
TYPE *d = vd, *n = vn; \
TYPE m = rm; \
uint16_t mask = mve_element_mask(env); \
unsigned e; \
bool qc = false; \
for (e = 0; e < 16 / ESIZE; e++, mask >>= ESIZE) { \
bool sat = false; \
mergemask(&d[H##ESIZE(e)], FN(n[H##ESIZE(e)], m, &sat), \
mask); \
qc |= sat & mask & 1; \
} \
if (qc) { \
env->vfp.qc[0] = qc; \
} \
mve_advance_vpt(env); \
}
/* provide unsigned 2-op scalar helpers for all sizes */
#define DO_2OP_SCALAR_U(OP, FN) \
DO_2OP_SCALAR(OP##b, 1, uint8_t, FN) \
@ -523,6 +571,20 @@ 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)
DO_2OP_SAT_SCALAR(vqaddu_scalarb, 1, uint8_t, DO_UQADD_B)
DO_2OP_SAT_SCALAR(vqaddu_scalarh, 2, uint16_t, DO_UQADD_H)
DO_2OP_SAT_SCALAR(vqaddu_scalarw, 4, uint32_t, DO_UQADD_W)
DO_2OP_SAT_SCALAR(vqadds_scalarb, 1, int8_t, DO_SQADD_B)
DO_2OP_SAT_SCALAR(vqadds_scalarh, 2, int16_t, DO_SQADD_H)
DO_2OP_SAT_SCALAR(vqadds_scalarw, 4, int32_t, DO_SQADD_W)
DO_2OP_SAT_SCALAR(vqsubu_scalarb, 1, uint8_t, DO_UQSUB_B)
DO_2OP_SAT_SCALAR(vqsubu_scalarh, 2, uint16_t, DO_UQSUB_H)
DO_2OP_SAT_SCALAR(vqsubu_scalarw, 4, uint32_t, DO_UQSUB_W)
DO_2OP_SAT_SCALAR(vqsubs_scalarb, 1, int8_t, DO_SQSUB_B)
DO_2OP_SAT_SCALAR(vqsubs_scalarh, 2, int16_t, DO_SQSUB_H)
DO_2OP_SAT_SCALAR(vqsubs_scalarw, 4, int32_t, DO_SQSUB_W)
static inline uint32_t do_vbrsrb(uint32_t n, uint32_t m)
{
m &= 0xff;

4
target/arm/translate-mve.c
View File

@ -446,6 +446,10 @@ DO_2OP_SCALAR(VHADD_S_scalar, vhadds_scalar)
DO_2OP_SCALAR(VHADD_U_scalar, vhaddu_scalar)
DO_2OP_SCALAR(VHSUB_S_scalar, vhsubs_scalar)
DO_2OP_SCALAR(VHSUB_U_scalar, vhsubu_scalar)
DO_2OP_SCALAR(VQADD_S_scalar, vqadds_scalar)
DO_2OP_SCALAR(VQADD_U_scalar, vqaddu_scalar)
DO_2OP_SCALAR(VQSUB_S_scalar, vqsubs_scalar)
DO_2OP_SCALAR(VQSUB_U_scalar, vqsubu_scalar)
DO_2OP_SCALAR(VBRSR, vbrsr)
static bool do_long_dual_acc(DisasContext *s, arg_vmlaldav *a,