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@ -163,6 +163,19 @@ optimize_assignment (struct instruction *irb, size_t irb_len)
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return out;
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}
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// Add the offset of the LEFT/RIGHT instruction to the accumulator
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static bool
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add_direction_offset (struct instruction *irb, intptr_t *acc)
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{
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if (irb->cmd == RIGHT)
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*acc += irb->arg;
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else if (irb->cmd == LEFT)
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*acc -= (intptr_t) irb->arg;
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else
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return false;
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return true;
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}
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// Add offsets to INC/DEC/SET stuck between LEFT/RIGHT
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// and compress the LEFT/RIGHT sequences
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static size_t
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@ -172,11 +185,7 @@ optimize_offseted_inc_dec (struct instruction *irb, size_t irb_len)
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for (in = 0, out = 0; in < irb_len; in++, out++)
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{
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intptr_t dir = 0;
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if (irb[in].cmd == RIGHT)
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dir = irb[in].arg;
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else if (irb[in].cmd == LEFT)
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dir = -(intptr_t) irb[in].arg;
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else
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if (!add_direction_offset (&irb[in], &dir))
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{
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irb[out] = irb[in];
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continue;
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@ -187,15 +196,9 @@ optimize_offseted_inc_dec (struct instruction *irb, size_t irb_len)
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// An immediate offset has its limits on x86-64
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if (dir < INT8_MIN || dir > INT8_MAX)
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break;
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intptr_t diff;
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if (irb[in + 2].cmd == RIGHT)
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diff = irb[in + 2].arg;
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else if (irb[in + 2].cmd == LEFT)
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diff = -(intptr_t) irb[in + 2].arg;
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else
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intptr_t diff = 0;
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if (!add_direction_offset (&irb[in + 2], &diff))
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break;
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int cmd = irb[in + 1].cmd;
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if (cmd != INC && cmd != DEC && cmd != SET)
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break;
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@ -209,14 +212,8 @@ optimize_offseted_inc_dec (struct instruction *irb, size_t irb_len)
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}
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for (; in + 1 < irb_len; in++)
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{
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if (irb[in + 1].cmd == RIGHT)
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dir += irb[in + 1].arg;
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else if (irb[in + 1].cmd == LEFT)
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dir -= (intptr_t) irb[in + 1].arg;
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else
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if (!add_direction_offset (&irb[in + 1], &dir))
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break;
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}
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if (!dir)
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out--;
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