From 4e2220c27f92e09a32eb5bd2d0bb1d8e076f1d06 Mon Sep 17 00:00:00 2001
From: Ryan Houdek <Sonicadvance1@gmail.com>
Date: Tue, 11 Jan 2022 01:19:10 -0800
Subject: [PATCH] unittests: Adds ptest unit test to ensure correct flag
 setting

ptest wasn't correctly setting OF, SF, AF, and PF to zero until now.
Do a unit test to ensure correct behaviour here
---
 unittests/ASM/H0F38/66_17_2.asm | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)
 create mode 100644 unittests/ASM/H0F38/66_17_2.asm

diff --git a/unittests/ASM/H0F38/66_17_2.asm b/unittests/ASM/H0F38/66_17_2.asm
new file mode 100644
index 000000000..02dff1fc7
--- /dev/null
+++ b/unittests/ASM/H0F38/66_17_2.asm
@@ -0,0 +1,32 @@
+%ifdef CONFIG
+{
+  "RegData": {
+    "RAX": "0xFFFFFFFFFFFF43FF",
+    "RBX": "0"
+  }
+}
+%endif
+
+; Set EFLAGS to known value with sahf
+mov rax, -1
+sahf
+
+movups xmm0, [rel .data]
+; Tests a bug that FEX had where ptest would not set OF, SF, AF, PF to zero
+ptest xmm0, xmm0
+
+; Now load back
+; ZF = 1
+; CF = 1
+; OF, SF, AF, PF should be zero
+lahf
+
+; lahf doesn't get OF, get it with seto
+mov rbx, 0
+seto bl
+
+hlt
+
+.data:
+dq 0
+dq 0