From 3bac8a6bc4f04ed9d302896264809b191477e11b Mon Sep 17 00:00:00 2001
From: lemon <lsof@mailbox.org>
Date: Tue, 9 Sep 2025 10:46:18 +0200
Subject: fixes, delnops

---
 ir.c | 34 ++++++++++++++++++++++++++++++++--
 1 file changed, 32 insertions(+), 2 deletions(-)

(limited to 'ir.c')

diff --git a/ir.c b/ir.c
index 2f65192..9ffac50 100644
--- a/ir.c
+++ b/ir.c
@@ -427,7 +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-1; ++i)
+   for (int i = idx; i < blk->ins.n - 1; ++i)
       blk->ins.p[i] = blk->ins.p[i + 1];
    --blk->ins.n;
 }
@@ -440,11 +440,37 @@ delphi(struct block *blk, int idx)
    memcpy(&instrtab[t], &instrfreelist, sizeof(int));
    instrfreelist = t;
    deluses(t);
-   for (int i = idx; i < blk->phi.n; ++i)
+   for (int i = idx; i < blk->phi.n - 1; ++i)
       blk->phi.p[i] = blk->phi.p[i + 1];
    --blk->phi.n;
 }
 
+void
+delnops(struct block *blk)
+{
+   int i, n, t;
+   /* delete trailing nops */
+   while (blk->ins.n > 0 && instrtab[t = blk->ins.p[blk->ins.n - 1]].op == Onop) {
+      --blk->ins.n;
+      memcpy(&instrtab[t], &instrfreelist, sizeof(int));
+      instrfreelist = t;
+   }
+   /* delete rest of nops */
+   for (i = blk->ins.n - 2, n = 0; i >= 0; --i) {
+      if (instrtab[t = blk->ins.p[i]].op == Onop) {
+         memcpy(&instrtab[t], &instrfreelist, sizeof(int));
+         instrfreelist = t;
+         ++n;
+      } else if (n) {
+         memmove(blk->ins.p+i+1, blk->ins.p+i+1+n, (blk->ins.n - n - i)*sizeof *blk->ins.p);
+         blk->ins.n -= n;
+         n = 0;
+      }
+   }
+   if (n)
+      memmove(blk->ins.p, blk->ins.p + n, (blk->ins.n -= n)*sizeof *blk->ins.p);
+}
+
 void
 fillblkids(struct function *fn)
 {
@@ -568,6 +594,10 @@ irfini(struct function *fn)
    lowerintrin(fn);
    mem2reg(fn);
    copyopt(fn);
+   if (ccopt.dbg.o) {
+      efmt("<< Before isel >>\n");
+      irdump(fn);
+   }
    mctarg->isel(fn);
    regalloc(fn);
    if (!ccopt.dbg.any)
-- 
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