diff options
| -rw-r--r-- | target/arm/translate-sve.c | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/target/arm/translate-sve.c b/target/arm/translate-sve.c index 7388e1dbc7..034e816491 100644 --- a/target/arm/translate-sve.c +++ b/target/arm/translate-sve.c @@ -61,13 +61,27 @@ static int tszimm_esz(DisasContext *s, int x) static int tszimm_shr(DisasContext *s, int x) { - return (16 << tszimm_esz(s, x)) - x; + /* + * We won't use the tszimm_shr() value if tszimm_esz() returns -1 (the + * trans function will check for esz < 0), so we can return any + * value we like from here in that case as long as we avoid UB. + */ + int esz = tszimm_esz(s, x); + if (esz < 0) { + return esz; + } + return (16 << esz) - x; } /* See e.g. LSL (immediate, predicated). */ static int tszimm_shl(DisasContext *s, int x) { - return x - (8 << tszimm_esz(s, x)); + /* As with tszimm_shr(), value will be unused if esz < 0 */ + int esz = tszimm_esz(s, x); + if (esz < 0) { + return esz; + } + return x - (8 << esz); } /* The SH bit is in bit 8. Extract the low 8 and shift. */ |