diff options
Diffstat (limited to 'bfc-amd64-linux.c')
| -rw-r--r-- | bfc-amd64-linux.c | 37 |
1 files changed, 17 insertions, 20 deletions
diff --git a/bfc-amd64-linux.c b/bfc-amd64-linux.c index ee14e25..592c3ab 100644 --- a/bfc-amd64-linux.c +++ b/bfc-amd64-linux.c @@ -163,6 +163,19 @@ optimize_assignment (struct instruction *irb, size_t irb_len) return out; } +// Add the offset of the LEFT/RIGHT instruction to the accumulator +static bool +add_direction_offset (struct instruction *irb, intptr_t *acc) +{ + if (irb->cmd == RIGHT) + *acc += irb->arg; + else if (irb->cmd == LEFT) + *acc -= (intptr_t) irb->arg; + else + return false; + return true; +} + // Add offsets to INC/DEC/SET stuck between LEFT/RIGHT // and compress the LEFT/RIGHT sequences static size_t @@ -172,11 +185,7 @@ optimize_offseted_inc_dec (struct instruction *irb, size_t irb_len) for (in = 0, out = 0; in < irb_len; in++, out++) { intptr_t dir = 0; - if (irb[in].cmd == RIGHT) - dir = irb[in].arg; - else if (irb[in].cmd == LEFT) - dir = -(intptr_t) irb[in].arg; - else + if (!add_direction_offset (&irb[in], &dir)) { irb[out] = irb[in]; continue; @@ -187,15 +196,9 @@ optimize_offseted_inc_dec (struct instruction *irb, size_t irb_len) // An immediate offset has its limits on x86-64 if (dir < INT8_MIN || dir > INT8_MAX) break; - - intptr_t diff; - if (irb[in + 2].cmd == RIGHT) - diff = irb[in + 2].arg; - else if (irb[in + 2].cmd == LEFT) - diff = -(intptr_t) irb[in + 2].arg; - else + intptr_t diff = 0; + if (!add_direction_offset (&irb[in + 2], &diff)) break; - int cmd = irb[in + 1].cmd; if (cmd != INC && cmd != DEC && cmd != SET) break; @@ -209,14 +212,8 @@ optimize_offseted_inc_dec (struct instruction *irb, size_t irb_len) } for (; in + 1 < irb_len; in++) - { - if (irb[in + 1].cmd == RIGHT) - dir += irb[in + 1].arg; - else if (irb[in + 1].cmd == LEFT) - dir -= (intptr_t) irb[in + 1].arg; - else + if (!add_direction_offset (&irb[in + 1], &dir)) break; - } if (!dir) out--; |