From bb1b37e6c12a81b10cdae5f56750fc7b6e91fe47 Mon Sep 17 00:00:00 2001
From: Emma Anholt <emma@anholt.net>
Date: Wed, 22 Feb 2023 11:48:05 -0800
Subject: [PATCH] glsl/opt_algebraic: Drop shifts of 0 optimizations.
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No change on freedreno shader-db.

Acked-by: Timothy Arceri <tarceri@itsqueeze.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/21475>
---
 src/compiler/glsl/opt_algebraic.cpp | 10 ----------
 1 file changed, 10 deletions(-)

diff --git a/src/compiler/glsl/opt_algebraic.cpp b/src/compiler/glsl/opt_algebraic.cpp
index c8112ef6790..a80e68aa634 100644
--- a/src/compiler/glsl/opt_algebraic.cpp
+++ b/src/compiler/glsl/opt_algebraic.cpp
@@ -575,16 +575,6 @@ ir_algebraic_visitor::handle_expression(ir_expression *ir)
                                            ir->operands[1]);
       break;
 
-   case ir_binop_rshift:
-   case ir_binop_lshift:
-      /* 0 >> x == 0 */
-      if (is_vec_zero(op_const[0]))
-         return ir->operands[0];
-      /* x >> 0 == x */
-      if (is_vec_zero(op_const[1]))
-         return ir->operands[0];
-      break;
-
    case ir_binop_logic_and:
       if (is_vec_one(op_const[0])) {
 	 return ir->operands[1];