Mesa (master): vl: replace DIV-ADD with MAD using inverse size

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Module: Mesa
Branch: master
Commit: 187c308b96d0501552ec0287ec117273b51228f0
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=187c308b96d0501552ec0287ec117273b51228f0

Author: Gert Wollny <gert.wollny at collabora.com>
Date:   Wed Jun 12 16:04:33 2019 +0200

vl: replace DIV-ADD with MAD using inverse size

Optimize the shader a bit by emitting MAD with the inverse size values
instead of DIV+ADD.

Signed-off-by: Gert Wollny <gert.wollny at collabora.com>
Reviewed-by: Marek Olšák <marek.olsak at amd.com>

---

 src/gallium/auxiliary/vl/vl_bicubic_filter.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/src/gallium/auxiliary/vl/vl_bicubic_filter.c b/src/gallium/auxiliary/vl/vl_bicubic_filter.c
index f3f8cbee778..077e2131bfd 100644
--- a/src/gallium/auxiliary/vl/vl_bicubic_filter.c
+++ b/src/gallium/auxiliary/vl/vl_bicubic_filter.c
@@ -201,10 +201,11 @@ create_frag_shader(struct vl_bicubic_filter *filter, unsigned video_width,
 
    ureg_FLR(shader, ureg_writemask(t_array[22], TGSI_WRITEMASK_XY),
             ureg_src(t_array[22]));
-   ureg_DIV(shader, ureg_writemask(t_array[22], TGSI_WRITEMASK_XY),
-            ureg_src(t_array[22]), ureg_imm2f(shader, video_width, video_height));
-   ureg_ADD(shader, ureg_writemask(t_array[22], TGSI_WRITEMASK_XY),
-            ureg_src(t_array[22]), half_pixel);
+
+   ureg_MAD(shader, ureg_writemask(t_array[22], TGSI_WRITEMASK_XY),
+            ureg_src(t_array[22]),
+            ureg_imm2f(shader, 1.0f / video_width, 1.0f / video_height),
+            half_pixel);
 
    /*
     * t_array[0..*] = vtex + offset[0..*]