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target/riscv: rvv-1.0: Add ELEN checks for widening and narrowing instructions 

SEW has the limitation which cannot exceed ELEN.

Widening instructions have a destination group with EEW = 2*SEW
and narrowing instructions have a source operand with EEW = 2*SEW.
Both of the instructions have the limitation of: 2*SEW <= ELEN.

Signed-off-by: Frank Chang <frank.chang@sifive.com>
Acked-by: Alistair Francis <alistair.francis@wdc.com>
Message-Id: <20211210075704.23951-78-frank.chang@sifive.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
This commit is contained in:
Frank Chang 2021-12-10 15:57:03 +08:00 committed by Alistair Francis
parent 45ca2ca6bd
commit cc13aa3614
2 changed files with 13 additions and 6 deletions
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17
target/riscv/insn_trans/trans_rvv.c.inc
View File

@ -386,9 +386,10 @@ static bool vext_check_mss(DisasContext *s, int vd, int vs1, int vs2)
* can not be greater than 8 vector registers (Section 5.2):
* => LMUL < 8.
* => SEW < 64.
* 2. Destination vector register number is multiples of 2 * LMUL.
* 2. Double-width SEW cannot greater than ELEN.
* 3. Destination vector register number is multiples of 2 * LMUL.
* (Section 3.4.2)
* 3. Destination vector register group for a masked vector
* 4. Destination vector register group for a masked vector
* instruction cannot overlap the source mask register (v0).
* (Section 5.3)
*/
@ -396,6 +397,7 @@ static bool vext_wide_check_common(DisasContext *s, int vd, int vm)
{
return (s->lmul <= 2) &&
(s->sew < MO_64) &&
((s->sew + 1) <= (s->elen >> 4)) &&
require_align(vd, s->lmul + 1) &&
require_vm(vm, vd);
}
@ -409,11 +411,12 @@ static bool vext_wide_check_common(DisasContext *s, int vd, int vm)
* can not be greater than 8 vector registers (Section 5.2):
* => LMUL < 8.
* => SEW < 64.
* 2. Source vector register number is multiples of 2 * LMUL.
* 2. Double-width SEW cannot greater than ELEN.
* 3. Source vector register number is multiples of 2 * LMUL.
* (Section 3.4.2)
* 3. Destination vector register number is multiples of LMUL.
* 4. Destination vector register number is multiples of LMUL.
* (Section 3.4.2)
* 4. Destination vector register group for a masked vector
* 5. Destination vector register group for a masked vector
* instruction cannot overlap the source mask register (v0).
* (Section 5.3)
*/
@ -422,6 +425,7 @@ static bool vext_narrow_check_common(DisasContext *s, int vd, int vs2,
{
return (s->lmul <= 2) &&
(s->sew < MO_64) &&
((s->sew + 1) <= (s->elen >> 4)) &&
require_align(vs2, s->lmul + 1) &&
require_align(vd, s->lmul) &&
require_vm(vm, vd);
@ -2806,7 +2810,8 @@ GEN_OPIVV_TRANS(vredxor_vs, reduction_check)
/* Vector Widening Integer Reduction Instructions */
static bool reduction_widen_check(DisasContext *s, arg_rmrr *a)
{
return reduction_check(s, a) && (s->sew < MO_64);
return reduction_check(s, a) && (s->sew < MO_64) &&
((s->sew + 1) <= (s->elen >> 4));
}
GEN_OPIVV_WIDEN_TRANS(vwredsum_vs, reduction_widen_check)

2
target/riscv/translate.c
View File

@ -96,6 +96,7 @@ typedef struct DisasContext {
int8_t lmul;
uint8_t sew;
uint16_t vlen;
uint16_t elen;
target_ulong vstart;
bool vl_eq_vlmax;
uint8_t ntemp;
@ -705,6 +706,7 @@ static void riscv_tr_init_disas_context(DisasContextBase *dcbase, CPUState *cs)
ctx->ext_zfh = cpu->cfg.ext_zfh;
ctx->ext_zfhmin = cpu->cfg.ext_zfhmin;
ctx->vlen = cpu->cfg.vlen;
ctx->elen = cpu->cfg.elen;
ctx->mstatus_hs_fs = FIELD_EX32(tb_flags, TB_FLAGS, MSTATUS_HS_FS);
ctx->mstatus_hs_vs = FIELD_EX32(tb_flags, TB_FLAGS, MSTATUS_HS_VS);
ctx->hlsx = FIELD_EX32(tb_flags, TB_FLAGS, HLSX);