From dde478ce985b24b2e9fdcd297633e269e2b29e81 Mon Sep 17 00:00:00 2001
From: Dhruv Mark Collins <mark@igalia.com>
Date: Thu, 9 Oct 2025 13:56:30 +0000
Subject: [PATCH] util/math: Add ROUND_DOWN_TO_NPOT

The default ROUND_DOWN_TO only handles POT alignment values, so
an additional variant was added which handles NPOT alignment too.

Signed-off-by: Dhruv Mark Collins <mark@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/37802>
---
 src/util/u_math.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/util/u_math.h b/src/util/u_math.h
index 5f1fcc89a38..dbd0aa68a73 100644
--- a/src/util/u_math.h
+++ b/src/util/u_math.h
@@ -705,6 +705,12 @@ ROUND_DOWN_TO(uint64_t value, uint32_t alignment)
    return ((value) & ~(uint64_t)(alignment - 1));
 }
 
+static inline uint64_t
+ROUND_DOWN_TO_NPOT(uint64_t value, uint32_t alignment)
+{
+   return value - (value % alignment);
+}
+
 /**
  * Align a value, only works pot alignemnts.
  */