Mesa (master): vc4: Drop integer multiplies with 0 to moves of 0.

[Eric Anholt]

Module: Mesa
Branch: master
Commit: 1dcc1ee314a6907213e2abd5337ec0bbba3bd1bf
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=1dcc1ee314a6907213e2abd5337ec0bbba3bd1bf

Author: Eric Anholt <eric at anholt.net>
Date:   Mon Mar 30 10:44:28 2015 -0700

vc4: Drop integer multiplies with 0 to moves of 0.

This cleans up more instructions generated by uniform array indexing
multiplies.

total instructions in shared programs: 39989 -> 39961 (-0.07%)
instructions in affected programs:     896 -> 868 (-3.12%)

---

 src/gallium/drivers/vc4/vc4_opt_algebraic.c |    8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/gallium/drivers/vc4/vc4_opt_algebraic.c b/src/gallium/drivers/vc4/vc4_opt_algebraic.c
index d17669a..e40e0f3 100644
--- a/src/gallium/drivers/vc4/vc4_opt_algebraic.c
+++ b/src/gallium/drivers/vc4/vc4_opt_algebraic.c
@@ -248,6 +248,14 @@ qir_opt_algebraic(struct vc4_compile *c)
                         }
                         break;
 
+                case QOP_MUL24:
+                        if (replace_x_0_with_0(c, inst, 0) ||
+                            replace_x_0_with_0(c, inst, 1)) {
+                                progress = true;
+                                break;
+                        }
+                        break;
+
                 case QOP_AND:
                         if (replace_x_0_with_0(c, inst, 0) ||
                             replace_x_0_with_0(c, inst, 1)) {