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target/arm: Implement MVE VCADD 

Implement the MVE VCADD insn, which performs a complex add with
rotate.  Note that the size=0b11 encoding is VSBC.

The architecture grants some leeway for the "destination and Vm
source overlap" case for the size MO_32 case, but we choose not to
make use of it, instead always calculating all 16 bytes worth of
results before setting the destination register.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20210617121628.20116-42-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2021-06-17 13:16:25 +01:00
parent 89bc4c4f78
commit 67ec113b11
4 changed files with 51 additions and 2 deletions
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8
target/arm/helper-mve.h
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@ -251,6 +251,14 @@ DEF_HELPER_FLAGS_4(mve_vadci, TCG_CALL_NO_WG, void, env, ptr, ptr, ptr)
DEF_HELPER_FLAGS_4(mve_vsbc, TCG_CALL_NO_WG, void, env, ptr, ptr, ptr)
DEF_HELPER_FLAGS_4(mve_vsbci, TCG_CALL_NO_WG, void, env, ptr, ptr, ptr)
DEF_HELPER_FLAGS_4(mve_vcadd90b, TCG_CALL_NO_WG, void, env, ptr, ptr, ptr)
DEF_HELPER_FLAGS_4(mve_vcadd90h, TCG_CALL_NO_WG, void, env, ptr, ptr, ptr)
DEF_HELPER_FLAGS_4(mve_vcadd90w, TCG_CALL_NO_WG, void, env, ptr, ptr, ptr)
DEF_HELPER_FLAGS_4(mve_vcadd270b, TCG_CALL_NO_WG, void, env, ptr, ptr, ptr)
DEF_HELPER_FLAGS_4(mve_vcadd270h, TCG_CALL_NO_WG, void, env, ptr, ptr, ptr)
DEF_HELPER_FLAGS_4(mve_vcadd270w, TCG_CALL_NO_WG, void, env, ptr, ptr, ptr)
DEF_HELPER_FLAGS_4(mve_vadd_scalarb, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
DEF_HELPER_FLAGS_4(mve_vadd_scalarh, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)
DEF_HELPER_FLAGS_4(mve_vadd_scalarw, TCG_CALL_NO_WG, void, env, ptr, ptr, i32)

9
target/arm/mve.decode
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@ -161,9 +161,14 @@ VRHADD_S 111 0 1111 0 . .. ... 0 ... 0 0001 . 1 . 0 ... 0 @2op
VRHADD_U 111 1 1111 0 . .. ... 0 ... 0 0001 . 1 . 0 ... 0 @2op
VADC 1110 1110 0 . 11 ... 0 ... 0 1111 . 0 . 0 ... 0 @2op_nosz
VSBC 1111 1110 0 . 11 ... 0 ... 0 1111 . 0 . 0 ... 0 @2op_nosz
VADCI 1110 1110 0 . 11 ... 0 ... 1 1111 . 0 . 0 ... 0 @2op_nosz
VSBCI 1111 1110 0 . 11 ... 0 ... 1 1111 . 0 . 0 ... 0 @2op_nosz
{
VSBC 1111 1110 0 . 11 ... 0 ... 0 1111 . 0 . 0 ... 0 @2op_nosz
VSBCI 1111 1110 0 . 11 ... 0 ... 1 1111 . 0 . 0 ... 0 @2op_nosz
VCADD90 1111 1110 0 . .. ... 0 ... 0 1111 . 0 . 0 ... 0 @2op
VCADD270 1111 1110 0 . .. ... 0 ... 1 1111 . 0 . 0 ... 0 @2op
}
# Vector miscellaneous

29
target/arm/mve_helper.c
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@ -589,6 +589,35 @@ void HELPER(mve_vsbci)(CPUARMState *env, void *vd, void *vn, void *vm)
do_vadc(env, vd, vn, vm, -1, 1, true);
}
#define DO_VCADD(OP, ESIZE, TYPE, FN0, FN1) \
void HELPER(glue(mve_, OP))(CPUARMState *env, void *vd, void *vn, void *vm) \
{ \
TYPE *d = vd, *n = vn, *m = vm; \
uint16_t mask = mve_element_mask(env); \
unsigned e; \
TYPE r[16 / ESIZE]; \
/* Calculate all results first to avoid overwriting inputs */ \
for (e = 0; e < 16 / ESIZE; e++) { \
if (!(e & 1)) { \
r[e] = FN0(n[H##ESIZE(e)], m[H##ESIZE(e + 1)]); \
} else { \
r[e] = FN1(n[H##ESIZE(e)], m[H##ESIZE(e - 1)]); \
} \
} \
for (e = 0; e < 16 / ESIZE; e++, mask >>= ESIZE) { \
mergemask(&d[H##ESIZE(e)], r[e], mask); \
} \
mve_advance_vpt(env); \
}
#define DO_VCADD_ALL(OP, FN0, FN1) \
DO_VCADD(OP##b, 1, int8_t, FN0, FN1) \
DO_VCADD(OP##h, 2, int16_t, FN0, FN1) \
DO_VCADD(OP##w, 4, int32_t, FN0, FN1)
DO_VCADD_ALL(vcadd90, DO_SUB, DO_ADD)
DO_VCADD_ALL(vcadd270, DO_ADD, DO_SUB)
static inline int32_t do_sat_bhw(int64_t val, int64_t min, int64_t max, bool *s)
{
if (val > max) {

7
target/arm/translate-mve.c
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@ -420,6 +420,13 @@ DO_2OP(VQRDMLSDH, vqrdmlsdh)
DO_2OP(VQRDMLSDHX, vqrdmlsdhx)
DO_2OP(VRHADD_S, vrhadds)
DO_2OP(VRHADD_U, vrhaddu)
/*
* VCADD Qd == Qm at size MO_32 is UNPREDICTABLE; we choose not to diagnose
* so we can reuse the DO_2OP macro. (Our implementation calculates the
* "expected" results in this case.)
*/
DO_2OP(VCADD90, vcadd90)
DO_2OP(VCADD270, vcadd270)
static bool trans_VQDMULLB(DisasContext *s, arg_2op *a)
{