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target/arm: Implement MVE VPSEL 

Implement the MVE VPSEL insn, which sets each byte of the destination
vector Qd to the byte from either Qn or Qm depending on the value of
the corresponding bit in VPR.P0.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Peter Maydell 2021-08-13 17:11:51 +01:00
parent cce81873bc
commit c386443b16
4 changed files with 28 additions and 2 deletions
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2
target/arm/helper-mve.h
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@ -82,6 +82,8 @@ DEF_HELPER_FLAGS_4(mve_vorr, TCG_CALL_NO_WG, void, env, ptr, ptr, ptr)
DEF_HELPER_FLAGS_4(mve_vorn, TCG_CALL_NO_WG, void, env, ptr, ptr, ptr)
DEF_HELPER_FLAGS_4(mve_veor, TCG_CALL_NO_WG, void, env, ptr, ptr, ptr)
DEF_HELPER_FLAGS_4(mve_vpsel, TCG_CALL_NO_WG, void, env, ptr, ptr, ptr)
DEF_HELPER_FLAGS_4(mve_vaddb, TCG_CALL_NO_WG, void, env, ptr, ptr, ptr)
DEF_HELPER_FLAGS_4(mve_vaddh, TCG_CALL_NO_WG, void, env, ptr, ptr, ptr)
DEF_HELPER_FLAGS_4(mve_vaddw, TCG_CALL_NO_WG, void, env, ptr, ptr, ptr)

7
target/arm/mve.decode
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@ -468,8 +468,11 @@ VSHLC 111 0 1110 1 . 1 imm:5 ... 0 1111 1100 rdm:4 qd=%qd
# effectively "VCMP then VPST". A plain "VCMP" has a mask field of zero.
VCMPEQ 1111 1110 0 . .. ... 1 ... 0 1111 0 0 . 0 ... 0 @vcmp
VCMPNE 1111 1110 0 . .. ... 1 ... 0 1111 1 0 . 0 ... 0 @vcmp
VCMPCS 1111 1110 0 . .. ... 1 ... 0 1111 0 0 . 0 ... 1 @vcmp
VCMPHI 1111 1110 0 . .. ... 1 ... 0 1111 1 0 . 0 ... 1 @vcmp
{
VPSEL 1111 1110 0 . 11 ... 1 ... 0 1111 . 0 . 0 ... 1 @2op_nosz
VCMPCS 1111 1110 0 . .. ... 1 ... 0 1111 0 0 . 0 ... 1 @vcmp
VCMPHI 1111 1110 0 . .. ... 1 ... 0 1111 1 0 . 0 ... 1 @vcmp
}
VCMPGE 1111 1110 0 . .. ... 1 ... 1 1111 0 0 . 0 ... 0 @vcmp
VCMPLT 1111 1110 0 . .. ... 1 ... 1 1111 1 0 . 0 ... 0 @vcmp
VCMPGT 1111 1110 0 . .. ... 1 ... 1 1111 0 0 . 0 ... 1 @vcmp

19
target/arm/mve_helper.c
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@ -1842,3 +1842,22 @@ DO_VCMP_S(vcmpge, DO_GE)
DO_VCMP_S(vcmplt, DO_LT)
DO_VCMP_S(vcmpgt, DO_GT)
DO_VCMP_S(vcmple, DO_LE)
void HELPER(mve_vpsel)(CPUARMState *env, void *vd, void *vn, void *vm)
{
/*
* Qd[n] = VPR.P0[n] ? Qn[n] : Qm[n]
* but note that whether bytes are written to Qd is still subject
* to (all forms of) predication in the usual way.
*/
uint64_t *d = vd, *n = vn, *m = vm;
uint16_t mask = mve_element_mask(env);
uint16_t p0 = FIELD_EX32(env->v7m.vpr, V7M_VPR, P0);
unsigned e;
for (e = 0; e < 16 / 8; e++, mask >>= 8, p0 >>= 8) {
uint64_t r = m[H8(e)];
mergemask(&r, n[H8(e)], p0);
mergemask(&d[H8(e)], r, mask);
}
mve_advance_vpt(env);
}

2
target/arm/translate-mve.c
View File

@ -376,6 +376,8 @@ DO_LOGIC(VORR, gen_helper_mve_vorr)
DO_LOGIC(VORN, gen_helper_mve_vorn)
DO_LOGIC(VEOR, gen_helper_mve_veor)
DO_LOGIC(VPSEL, gen_helper_mve_vpsel)
#define DO_2OP(INSN, FN) \
static bool trans_##INSN(DisasContext *s, arg_2op *a) \
{ \