This helper is used later during the SSA construction and is,
as its name suggest, used to insert phi-nodes in the
instruction stream.
More exactly, the phi-node will be put at the begining of the
specified BB, just after the others phi-nodes but before
any other instructions, as required for their semantics
(although, it's less important for sparse since each operand
correspond first to a phi-source, so no phi-node directly
depending on themselves in sparse).
Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@xxxxxxxxx>
---
linearize.c | 36 ++++++++++++++++++++++++++++++++++++
linearize.h | 3 +++
2 files changed, 39 insertions(+)
diff --git a/linearize.c b/linearize.c
index 4cd2c75eb..d35842b1f 100644
--- a/linearize.c
+++ b/linearize.c
@@ -871,6 +871,42 @@ pseudo_t alloc_phi(struct basic_block *source, pseudo_t pseudo, struct symbol *t
return insn->target;
}
+struct instruction *alloc_phi_node(struct basic_block *bb, struct symbol *type, struct ident *ident)
+{
+ struct instruction *phi_node = alloc_typed_instruction(OP_PHI, type);
+ pseudo_t phi;
+
+ phi = alloc_pseudo(phi_node);
+ phi->ident = ident;
+ phi->def = phi_node;
+ phi_node->target = phi;
+ phi_node->bb = bb;
+ return phi_node;
+}
+
+void add_phi_node(struct basic_block *bb, struct instruction *phi_node)
+{
+ struct instruction *insn;
+
+ FOR_EACH_PTR(bb->insns, insn) {
+ enum opcode op = insn->opcode;
+ if (op == OP_PHI)
+ continue;
+ INSERT_CURRENT(phi_node, insn);
+ return;
+ } END_FOR_EACH_PTR(insn);
+
+ // FIXME
+ add_instruction(&bb->insns, phi_node);
+}
+
+struct instruction *insert_phi_node(struct basic_block *bb, struct symbol *var)
+{
+ struct instruction *phi_node = alloc_phi_node(bb, var, var->ident);
+ add_phi_node(bb, phi_node);
+ return phi_node;
+}
+
/*
* We carry the "access_data" structure around for any accesses,
* which simplifies things a lot. It contains all the access
diff --git a/linearize.h b/linearize.h
index 0285e28d3..0aaf11da5 100644
--- a/linearize.h
+++ b/linearize.h
@@ -377,6 +377,9 @@ extern void insert_select(struct basic_block *bb, struct instruction *br, struct
extern void insert_branch(struct basic_block *bb, struct instruction *br, struct basic_block *target);
struct instruction *alloc_phisrc(pseudo_t pseudo, struct symbol *type);
+struct instruction *alloc_phi_node(struct basic_block *bb, struct symbol *type, struct ident *ident);
+struct instruction *insert_phi_node(struct basic_block *bb, struct symbol *var);
+void add_phi_node(struct basic_block *bb, struct instruction *phi_node);
pseudo_t alloc_phi(struct basic_block *source, pseudo_t pseudo, struct symbol *type);
pseudo_t alloc_pseudo(struct instruction *def);
--
2.16.2
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