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A hopefully working naive PHI solution

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This commit is contained in:
Wolfgang (Blub) Bumiller 2012-11-21 16:05:54 +01:00
parent be8981a5c3
commit 390ac0d871
1 changed files with 26 additions and 0 deletions
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26
ir.c
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@ -1804,6 +1804,31 @@ static bool ir_block_naive_phi(ir_block *self)
for (p = 0; p < vec_size(instr->phi); ++p)
{
ir_value *v = instr->phi[p].value;
ir_block *b = instr->phi[p].from;
if (v->store == store_value &&
vec_size(v->reads) == 1 &&
vec_size(v->writes) == 1)
{
/* replace the value */
ir_instr_op(v->writes[0], 0, instr->_ops[0], true);
}
else
{
/* force a move instruction */
ir_instr *prevjump = vec_last(b->instr);
vec_pop(b->instr);
b->final = false;
instr->_ops[0]->store = store_global;
if (!ir_block_create_store(b, instr->_ops[0], v))
return false;
instr->_ops[0]->store = store_value;
vec_push(b->instr, prevjump);
b->final = true;
}
#if 0
ir_value *v = instr->phi[p].value;
for (w = 0; w < vec_size(v->writes); ++w) {
ir_value *old;
@ -1853,6 +1878,7 @@ static bool ir_block_naive_phi(ir_block *self)
}
}
}
#endif
}
ir_instr_delete(instr);
}