From: Ian Romanick <ian.d.romanick@intel.com>
Date: Mon, 27 Jun 2016 18:38:15 +0000 (-0700)
Subject: nir/algebraic: Optimize fabs(u2f(x))
X-Git-Url: https://git.libre-soc.org/?p=mesa.git;a=commitdiff_plain;h=0b626d75241213f2c5535b38aee233d6cdbed781

nir/algebraic: Optimize fabs(u2f(x))

I noticed this when I tried to do frexp(float(some_unsigned)) in the
ir_unop_find_lsb lowering pass.  The code generated for frexp() uses
fabs, and this resulted in an extra instruction.  Ultimately I ended up
not using frexp.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
---

diff --git a/src/compiler/nir/nir_opt_algebraic.py b/src/compiler/nir/nir_opt_algebraic.py
index 7d04ef941b7..0f0896be5df 100644
--- a/src/compiler/nir/nir_opt_algebraic.py
+++ b/src/compiler/nir/nir_opt_algebraic.py
@@ -75,6 +75,7 @@ optimizations = [
    (('ineg', ('ineg', a)), a),
    (('fabs', ('fabs', a)), ('fabs', a)),
    (('fabs', ('fneg', a)), ('fabs', a)),
+   (('fabs', ('u2f', a)), ('u2f', a)),
    (('iabs', ('iabs', a)), ('iabs', a)),
    (('iabs', ('ineg', a)), ('iabs', a)),
    (('~fadd', a, 0.0), a),