softpipe: use one fewer divide in sample_cube

GCC won't do this for us.  Makes a bigger difference to cubemap fps
than previous set of compilcated rearrangements.

diff --git a/src/gallium/drivers/softpipe/sp_tex_sample.c b/src/gallium/drivers/softpipe/sp_tex_sample.c
index 3bc4599e04593202cd17bd936e9e6249fdbfdfa4..50460df7cdf999b38381297f56a1023d0e4604fe 100644 (file)
--- a/src/gallium/drivers/softpipe/sp_tex_sample.c
+++ b/src/gallium/drivers/softpipe/sp_tex_sample.c
@@ -1543,9 +1543,12 @@ sample_cube(struct tgsi_sampler *tgsi_sampler,
          }
       }
 
-      ssss[j] = ( sc / ma + 1.0F ) * 0.5F;
-      tttt[j] = ( tc / ma + 1.0F ) * 0.5F;
-      samp->faces[j] = face;
+      {
+        const float ima = 1.0 / ma;
+        ssss[j] = ( sc * ima + 1.0F ) * 0.5F;
+        tttt[j] = ( tc * ima + 1.0F ) * 0.5F;
+        samp->faces[j] = face;
+      }
    }
 
    /* In our little pipeline, the compare stage is next.  If compare