From 4e520f671c2eda86bdef23830dfc861dcbadafb7 Mon Sep 17 00:00:00 2001
From: Karol Herbst <kherbst@redhat.com>
Date: Sat, 25 Apr 2026 14:36:57 +0200
Subject: [PATCH] nir: add fmul_rtz

It's needed in NVK for correctness with interpolation.

Backport-to: 26.1
Reviewed-by: Mel Henning <mhenning@darkrefraction.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/41179>
---
 src/compiler/nir/nir_opcodes.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/compiler/nir/nir_opcodes.py b/src/compiler/nir/nir_opcodes.py
index b7cf4cc4155..03cb99cc6df 100644
--- a/src/compiler/nir/nir_opcodes.py
+++ b/src/compiler/nir/nir_opcodes.py
@@ -780,6 +780,10 @@ if (nir_is_rounding_mode_rtz(execution_mode, bit_size)) {
 }
 """)
 
+binop("fmul_rtz", tfloat32, _2src_commutative + inexact_associative, """
+dst = _mesa_double_to_float_rtz((double)src0 * (double)src1);
+""")
+
 binop("fmulz", tfloat32, _2src_commutative + inexact_associative, """
 if (src0 == 0.0 || src1 == 0.0)
    dst = 0.0;