From 4e648c1693745f16fa3be40fa721bd9434618293 Mon Sep 17 00:00:00 2001
From: zhangyu117 <zhangyu117@xiaomi.com>
Date: Wed, 20 May 2026 20:07:53 +0800
Subject: [PATCH] tricore/fpu: Support tricore fpucmp for float.

Implement up_fpucmp to compare FPU register state between two
saved contexts. This is used by the ostest FPU test to verify
that FPU registers are properly preserved across context switches.

Signed-off-by: zhangyu117 <zhangyu117@xiaomi.com>
---
 arch/tricore/src/common/tricore_fpu.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/arch/tricore/src/common/tricore_fpu.c b/arch/tricore/src/common/tricore_fpu.c
index 6a28a6eaf91..ac811bbe0e6 100644
--- a/arch/tricore/src/common/tricore_fpu.c
+++ b/arch/tricore/src/common/tricore_fpu.c
@@ -26,6 +26,8 @@
 
 #include <nuttx/config.h>
 
+#include <string.h>
+
 #include "tricore_internal.h"
 
 /****************************************************************************
@@ -43,3 +45,16 @@ void tricore_fpuinit(void)
   __mtcr(FPU_SYNC_TRAP_REG,
          __mfcr(FPU_SYNC_TRAP_REG) | (1U << FPU_TRAP_FZE_SHIFT));
 }
+
+/****************************************************************************
+ * Name: up_fpucmp
+ ****************************************************************************/
+
+bool up_fpucmp(const void *saveregs1, const void *saveregs2)
+{
+  const uintptr_t *regs1 = saveregs1;
+  const uintptr_t *regs2 = saveregs2;
+
+  return memcmp(&regs1[REG_D8], &regs2[REG_D8],
+                8 * sizeof(uintptr_t)) == 0;
+}