From: David Given <dg@cowlark.com>
Date: Mon, 12 Dec 2016 22:54:25 +0000 (+0100)
Subject: Add infrastructure for new, special move hops.
X-Git-Url: https://git.ndcode.org/public/gitweb.cgi?a=commitdiff_plain;h=043b9413932c06f48f47bac3662eecb8ecdd0f7a;p=ack.git

Add infrastructure for new, special move hops.
---

diff --git a/mach/proto/mcg/hop.c b/mach/proto/mcg/hop.c
index c928b8fd0..ebf0568ff 100644
--- a/mach/proto/mcg/hop.c
+++ b/mach/proto/mcg/hop.c
@@ -17,6 +17,17 @@ struct hop* new_hop(struct basicblock* bb, struct ir* ir)
 	return hop;
 }
 
+struct hop* new_copy_hop(struct basicblock* bb, struct vreg* src, struct vreg* dest)
+{
+	struct hop* hop = heap_alloc(&proc_heap, 1, sizeof(*hop));
+	hop->id = hop_count++;
+    hop->bb = bb;
+    hop->is_move = true;
+    array_append(&hop->ins, src);
+    array_append(&hop->outs, dest);
+	return hop;
+}
+
 static struct insel* new_insel(enum insel_type type)
 {
 	struct insel* insel = heap_alloc(&proc_heap, 1, sizeof(*insel));
@@ -230,6 +241,9 @@ char* hop_render(struct hop* hop)
     bufferlen = 0;
 	buffer[0] = '\0';
 
+    if (hop->is_move && (hop->insels.count == 0))
+        appendf("(move %%%d -> %%%d)\n", hop->ins.item[0]->id, hop->outs.item[0]->id);
+
 	for (i=0; i<hop->insels.count; i++)
 	{
 		struct insel* insel = hop->insels.item[i];
diff --git a/mach/proto/mcg/hop.h b/mach/proto/mcg/hop.h
index d7b8f34b4..1e6be2049 100644
--- a/mach/proto/mcg/hop.h
+++ b/mach/proto/mcg/hop.h
@@ -43,6 +43,7 @@ struct hop
     const struct burm_instruction_data* insndata;
 	ARRAYOF(struct insel) insels;
 	struct vreg* output;
+	bool is_move;
 
     PMAPOF(struct vreg, struct constraint) constraints;
 
@@ -54,6 +55,7 @@ struct hop
 };
 
 extern struct hop* new_hop(struct basicblock* bb, struct ir* ir);
+extern struct hop* new_copy_hop(struct basicblock* bb, struct vreg* src, struct vreg* dest);
 
 extern void hop_add_string_insel(struct hop* hop, const char* string);
 extern void hop_add_hreg_insel(struct hop* hop, struct hreg* hreg, int index);