From: Jason Ekstrand <jason.ekstrand@intel.com>
Date: Sat, 5 Sep 2015 01:47:42 +0000 (-0700)
Subject: nir: Add a lower_fdiv option and use it in i965
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=7174d155e9b2d3ecc1d60f71e202838fa9359f1d;p=mesa.git

nir: Add a lower_fdiv option and use it in i965
---

diff --git a/src/glsl/nir/nir.h b/src/glsl/nir/nir.h
index 4c60dbd645a..415dda7712d 100644
--- a/src/glsl/nir/nir.h
+++ b/src/glsl/nir/nir.h
@@ -1433,6 +1433,7 @@ typedef struct nir_function {
 
 typedef struct nir_shader_compiler_options {
    bool lower_ffma;
+   bool lower_fdiv;
    bool lower_flrp;
    bool lower_fpow;
    bool lower_fsat;
diff --git a/src/glsl/nir/nir_opt_algebraic.py b/src/glsl/nir/nir_opt_algebraic.py
index 226e0a8d85c..880408bc367 100644
--- a/src/glsl/nir/nir_opt_algebraic.py
+++ b/src/glsl/nir/nir_opt_algebraic.py
@@ -66,6 +66,7 @@ optimizations = [
    (('imul', a, 1), a),
    (('fmul', a, -1.0), ('fneg', a)),
    (('imul', a, -1), ('ineg', a)),
+   (('fdiv', a, b), ('fmul', a, ('frcp', b)), 'options->lower_fdiv'),
    (('ffma', 0.0, a, b), b),
    (('ffma', a, 0.0, b), b),
    (('ffma', a, b, 0.0), ('fmul', a, b)),
diff --git a/src/mesa/drivers/dri/i965/brw_shader.cpp b/src/mesa/drivers/dri/i965/brw_shader.cpp
index 0007e5c07a5..4ef2777559f 100644
--- a/src/mesa/drivers/dri/i965/brw_shader.cpp
+++ b/src/mesa/drivers/dri/i965/brw_shader.cpp
@@ -96,6 +96,7 @@ brw_compiler_create(void *mem_ctx, const struct brw_device_info *devinfo)
     */
    nir_options->lower_ffma = true;
    nir_options->lower_sub = true;
+   nir_options->lower_fdiv = true;
 
    /* We want the GLSL compiler to emit code that uses condition codes */
    for (int i = 0; i < MESA_SHADER_STAGES; i++) {