From 4338f7d033fd5d7fea8c1976d3465d4cbcd4e797 Mon Sep 17 00:00:00 2001
From: Ian Romanick <ian.d.romanick@intel.com>
Date: Tue, 30 Sep 2025 17:29:22 -0700
Subject: [PATCH] nir/algebraic: Remove useless ftrunc inside f2i/f2u

Reviewed-by: Georg Lehmann <dadschoorse@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/37186>
---
 src/compiler/nir/nir_opt_algebraic.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/compiler/nir/nir_opt_algebraic.py b/src/compiler/nir/nir_opt_algebraic.py
index 681047afbc4..2e7e0e398b4 100644
--- a/src/compiler/nir/nir_opt_algebraic.py
+++ b/src/compiler/nir/nir_opt_algebraic.py
@@ -1876,6 +1876,8 @@ optimizations.extend([
    # Conversions
    (('f2i', ('ftrunc', a)), ('f2i', a)),
    (('f2u', ('ftrunc', a)), ('f2u', a)),
+   (('f2i', ('ffloor', 'a(is_not_negative)')), ('f2i', a)),
+   (('f2u', ('ffloor', a)), ('f2u', a)),
 
    # Conversions from 16 bits to 32 bits and back can always be removed
    (('f2fmp', ('f2f32', 'a@16')), a),