From 00a2332417bdacf7bee1bfa6ed3048200f8479d2 Mon Sep 17 00:00:00 2001
From: Christopher Haster <geky@geky.net>
Date: Sun, 14 Apr 2024 22:57:59 -0500
Subject: [PATCH] rbyd-rr: Tweaked both-diverged trimming to not pop

This adds some code:

           code          stack
  before: 34224           2864
  after:  34244 (+0.1%)   2864 (+0.0%)

                     code          frame          stack
  appendattr before: 2190            216            568
  appendattr after:  2232 (+1.9%)    216 (+0.0%)    568 (+0.0%)

But makes it so both diverged-trimming cases end up with a zero weight
unreachable alt, which may lead to more simplification...
---
 lfs.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/lfs.c b/lfs.c
index ea0abc2b..89b6f458 100644
--- a/lfs.c
+++ b/lfs.c
@@ -2919,9 +2919,9 @@ trunk:;
                         lfs_swap32(&jump, &branch_);
                     }
 
-                    weight += p[0].weight;
-                    jump = p[0].jump;
-                    lfsr_p_pop(p);
+                    p[0].alt = alt | LFSR_TAG_R;
+                    p[0].weight += weight;
+                    weight = 0;
 
                 // one diverged? trim so alt is pruned
                 } else {