i965/fs: fix assign_constant_locations() for doubles

Uniform doubles will read two registers, in which case we need to mark
both as being live.

v2 (Sam):
  - Use a formula to get the number of registers read with proper
    units (Curro).

Reviewed-by: Kenneth Graunke <[email protected]>
Reviewed-by: Jordan Justen <[email protected]>
Reviewed-by: Francisco Jerez <[email protected]>

1 files changed, 6 insertions, 2 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp
index d0ce79d101a..6eae49fdf4a 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -2056,8 +2056,12 @@ fs_visitor::assign_constant_locations()
             }
             is_live[last] = true;
          } else {
-            if (constant_nr >= 0 && constant_nr < (int) uniforms)
-               is_live[constant_nr] = true;
+            if (constant_nr >= 0 && constant_nr < (int) uniforms) {
+               int regs_read = inst->components_read(i) *
+                  type_sz(inst->src[i].type) / 4;
+               for (int j = 0; j < regs_read; j++)
+                  is_live[constant_nr + j] = true;
+            }
          }
       }
    }