From a2b107b61b1fa7d2ac7689b93ac3fcd124c842fe Mon Sep 17 00:00:00 2001
From: Kaz Kylheku <kaz@kylheku.com>
Date: Mon, 17 Apr 2023 16:55:21 -0700
Subject: compiler: propagate t-reg rename into end insn.

* stdlib/optimize.tl (basic-blocks rename): When we stop
the renaming due to an end instruction and the src
being a v-reg, we can still do the rename in that end
instruction itself. If the v-reg becomes invalid, that
doesn't happen until after the instruction.
---
 stdlib/optimize.tl | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/stdlib/optimize.tl b/stdlib/optimize.tl
index f3e2a6c6..095350d3 100644
--- a/stdlib/optimize.tl
+++ b/stdlib/optimize.tl
@@ -385,7 +385,7 @@
           (cond
             (close (add insn))
             ((and vreg end)
-             (add insn)
+             (add (subst-preserve dst src bb li insn))
              (pend insns)
              (set insns nil))
             ((or (mequal dst li.def0 li.def1)
-- 
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