From 86fd84870a994d6f9a6a630a07fcf1b840c5705b Mon Sep 17 00:00:00 2001
From: "Herman S." <429230+has207@users.noreply.github.com>
Date: Sat, 21 Mar 2026 00:52:31 +0900
Subject: [PATCH] [Testing] reset guest rounding mode before each test run

prevents a dirty FPU rounding mode from leaking between test cases
---
 src/xenia/cpu/testing/util.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/xenia/cpu/testing/util.h b/src/xenia/cpu/testing/util.h
index 96ecf638b..08a075709 100644
--- a/src/xenia/cpu/testing/util.h
+++ b/src/xenia/cpu/testing/util.h
@@ -77,6 +77,10 @@ class TestFunction {
       auto ctx = thread_state->context();
       ctx->lr = 0xBCBCBCBC;
 
+      // Reset hardware FPU rounding mode to nearest before each run,
+      // in case a prior test left it dirty.
+      processor->backend()->SetGuestRoundingMode(ctx, 0);
+
       pre_call(ctx);
 
       fn->Call(thread_state.get(), uint32_t(ctx->lr));