From 9c685d5b6ca1686f944fb239ec89511f24801d44 Mon Sep 17 00:00:00 2001
From: Miquel Sabaté Solà <mssola@mssola.com>
Date: Sun, 6 Sep 2026 21:42:34 +0200
Subject: vnf: also set the carry on a zero compare
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Add also a test to further check corner cases on compare instructions.

Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
---
 tests/expected/runrom/cmp.txt | 18 ++++++++++++++++++
 tests/runrom/cmp.s            | 37 +++++++++++++++++++++++++++++++++++++
 2 files changed, 55 insertions(+)
 create mode 100644 tests/expected/runrom/cmp.txt
 create mode 100644 tests/runrom/cmp.s

(limited to 'tests')

diff --git a/tests/expected/runrom/cmp.txt b/tests/expected/runrom/cmp.txt
new file mode 100644
index 0000000..e76570b
--- /dev/null
+++ b/tests/expected/runrom/cmp.txt
@@ -0,0 +1,18 @@
+<start>		PC: $8000, cycles: 7, registers: [a: $00, x: $00, y: $00, sp: $FD], status: ----I--
+lda #$00	PC: $8002, cycles: 9, registers: [a: $00, x: $00, y: $00, sp: $FD], status: ----IZ-
+sta $00		PC: $8004, cycles: 12, registers: [a: $00, x: $00, y: $00, sp: $FD], status: ----IZ-
+cmp $00		PC: $8006, cycles: 15, registers: [a: $00, x: $00, y: $00, sp: $FD], status: ----IZC
+inc $00		PC: $8008, cycles: 20, registers: [a: $00, x: $00, y: $00, sp: $FD], status: ----I-C
+cmp $00		PC: $800A, cycles: 23, registers: [a: $00, x: $00, y: $00, sp: $FD], status: N---I--
+lda #$02	PC: $800C, cycles: 25, registers: [a: $02, x: $00, y: $00, sp: $FD], status: ----I--
+cmp $00		PC: $800E, cycles: 28, registers: [a: $02, x: $00, y: $00, sp: $FD], status: ----I-C
+lda #$01	PC: $8010, cycles: 30, registers: [a: $01, x: $00, y: $00, sp: $FD], status: ----I-C
+cmp $00		PC: $8012, cycles: 33, registers: [a: $01, x: $00, y: $00, sp: $FD], status: ----IZC
+lda #$FF	PC: $8014, cycles: 35, registers: [a: $FF, x: $00, y: $00, sp: $FD], status: N---I-C
+cmp $00		PC: $8016, cycles: 38, registers: [a: $FF, x: $00, y: $00, sp: $FD], status: N---I-C
+rts		PC: $8017, cycles: 44, registers: [a: $FF, x: $00, y: $00, sp: $FD], status: N---I-C
+<end>
+
+== Memory dump ==
+
+[$0] = $01 [reads=6, writes=2]
diff --git a/tests/runrom/cmp.s b/tests/runrom/cmp.s
new file mode 100644
index 0000000..29deda3
--- /dev/null
+++ b/tests/runrom/cmp.s
@@ -0,0 +1,37 @@
+.segment "HEADER"
+    .byte 'N', 'E', 'S', $1A
+    .byte $02, $01
+    .byte $00
+    .byte $00
+
+.segment "CHARS"
+.byte 0
+
+.segment "VECTORS"
+    .addr reset, reset, reset
+
+.segment "CODE"
+;; asan:stack full
+
+zp_mem = $00
+
+.proc reset
+    lda #0
+    sta zp_mem
+
+    cmp zp_mem
+
+    inc zp_mem
+    cmp zp_mem
+
+    lda #2
+    cmp zp_mem
+
+    lda #1
+    cmp zp_mem
+
+    lda #$FF
+    cmp zp_mem
+
+    rts
+.endproc
-- 
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