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From 0abde25c632e6b3343d07d978d9cc4209fe05f58 Mon Sep 17 00:00:00 2001
From: Josef Schlehofer <pepe.schlehofer@gmail.com>
Date: Sat, 15 Aug 2026 09:11:08 +0200
Subject: [PATCH] PPC: Fix pairs() over hash-less tables on soft-float targets
BC_ITERN checks the itype of the node value in RB to skip empty slots
in the hash part. Upstream loads RB unconditionally before the FPU
split; commit 2763a421 ("Patch for PPC64 support") moved that load
into the FPU branch only. On soft-float builds, RB still contains
RC*8 from the hash-part setup, so the nil check never succeeds and
iterating a table whose hash part is empty yields one extra
(nil, nil) pair.
Check CARG1 instead, which the soft-float branch already loads with
the itype. The FPU branch is left untouched. Upstream LuaJIT is
unaffected.
Reproducer on Turris 1.x (e500v2, 32-bit big-endian, soft-float):
$ luajit -e 'for k,v in pairs({7,8,9}) do print(k,v) end'
1 7
2 8
3 9
nil nil -- spurious
Signed-off-by: Josef Schlehofer <pepe.schlehofer@gmail.com>
---
src/vm_ppc.dasc | 4 ++++
1 file changed, 4 insertions(+)
--- a/src/vm_ppc.dasc
+++ b/src/vm_ppc.dasc
@@ -5807,7 +5807,11 @@ static void build_ins(BuildCtx *ctx, BCO
| lwz CARG2, 4(CARG3)
| add NODE:TMP3, TMP2, TMP3
|.endif
+ |.if FPU
| checknil RB
+ |.else
+ | checknil CARG1
+ |.endif
| lwz INS, -4(PC)
| beq >7
|.if FPU
|
