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target/arm: Fix decode of align in VLDST_single 

The encoding of size = 2 and size = 3 had the incorrect decode
for align, overlapping the stride field.  This error was hidden
by what should have been unnecessary masking in translate.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20210419202257.161730-2-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Richard Henderson 2021-04-19 13:22:27 -07:00 committed by Peter Maydell
parent 33e74c3172
commit a736cbc303
2 changed files with 4 additions and 4 deletions
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4
target/arm/neon-ls.decode
View File

@ -46,7 +46,7 @@ VLD_all_lanes 1111 0100 1 . 1 0 rn:4 .... 11 n:2 size:2 t:1 a:1 rm:4 \
VLDST_single 1111 0100 1 . l:1 0 rn:4 .... 00 n:2 reg_idx:3 align:1 rm:4 \
vd=%vd_dp size=0 stride=1
VLDST_single 1111 0100 1 . l:1 0 rn:4 .... 01 n:2 reg_idx:2 align:2 rm:4 \
VLDST_single 1111 0100 1 . l:1 0 rn:4 .... 01 n:2 reg_idx:2 . align:1 rm:4 \
vd=%vd_dp size=1 stride=%imm1_5_p1
VLDST_single 1111 0100 1 . l:1 0 rn:4 .... 10 n:2 reg_idx:1 align:3 rm:4 \
VLDST_single 1111 0100 1 . l:1 0 rn:4 .... 10 n:2 reg_idx:1 . align:2 rm:4 \
vd=%vd_dp size=2 stride=%imm1_6_p1

4
target/arm/translate-neon.c.inc
View File

@ -606,7 +606,7 @@ static bool trans_VLDST_single(DisasContext *s, arg_VLDST_single *a)
switch (nregs) {
case 1:
if (((a->align & (1 << a->size)) != 0) ||
(a->size == 2 && ((a->align & 3) == 1 || (a->align & 3) == 2))) {
(a->size == 2 && (a->align == 1 || a->align == 2))) {
return false;
}
break;
@ -621,7 +621,7 @@ static bool trans_VLDST_single(DisasContext *s, arg_VLDST_single *a)
}
break;
case 4:
if ((a->size == 2) && ((a->align & 3) == 3)) {
if (a->size == 2 && a->align == 3) {
return false;
}
break;