From e043811980db560fc2507bb53b644e54c80527dc Mon Sep 17 00:00:00 2001
From: lemon <lsof@mailbox.org>
Date: Mon, 8 Sep 2025 22:05:33 +0200
Subject: regalloc: start implementing linear scan

---
 ir.c | 22 +++++++++++++++++++---
 1 file changed, 19 insertions(+), 3 deletions(-)

(limited to 'ir.c')

diff --git a/ir.c b/ir.c
index 06d5409..2f65192 100644
--- a/ir.c
+++ b/ir.c
@@ -1,5 +1,4 @@
 #include "ir.h"
-#include "endian.h"
 #include "obj.h"
 
 uchar type2cls[NTYPETAG];
@@ -13,6 +12,13 @@ const char *opnames[] = {
 #undef _
 };
 
+const uchar opnarg[] = {
+   0,
+#define _(o,n) n,
+#include "op.def"
+#undef _
+};
+
 struct instr instrtab[MAXINSTR];
 struct use *instruse[MAXINSTR];
 short instrnuse[MAXINSTR];
@@ -362,6 +368,17 @@ insertphi(struct block *blk, enum irclass cls)
    return mkref(RTMP, new);
 }
 
+void
+numberinstrs(struct function *fn)
+{
+   struct block *blk = fn->entry;
+   int start = 0;
+   do {
+      blk->inumstart = start;
+      start += blk->ins.n+2;
+   } while ((blk = blk->lnext) != fn->entry);
+}
+
 /* require use */
 void
 replcuses(union ref from, union ref to)
@@ -387,7 +404,6 @@ replcuses(union ref from, union ref to)
          if (u[j].bits == from.bits) {
             u[j].bits = to.bits;
             adduse(use.blk, use.u, to);
-            deluse(use.blk, use.u, from);
             --i;
             break;
          }
@@ -411,7 +427,7 @@ delinstr(struct block *blk, int idx)
    memcpy(&instrtab[t], &instrfreelist, sizeof(int));
    instrfreelist = t;
    deluses(t);
-   for (int i = idx; i < blk->ins.n; ++i)
+   for (int i = idx; i < blk->ins.n-1; ++i)
       blk->ins.p[i] = blk->ins.p[i + 1];
    --blk->ins.n;
 }
-- 
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