--- src/mesa/drivers/dri/i965/brw_fs.cpp | 12 ++++++++++++ 1 file changed, 12 insertions(+)
diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp index 1e6ffbc..1a16f4e 100644 --- a/src/mesa/drivers/dri/i965/brw_fs.cpp +++ b/src/mesa/drivers/dri/i965/brw_fs.cpp @@ -2245,6 +2245,18 @@ fs_visitor::dead_code_eliminate_local() * Implements register coalescing: Checks if the two registers involved in a * raw move don't interfere, in which case they can both be stored in the same * place and the MOV removed. + * + * To do this, all uses of the source of the MOV in the shader are replaced + * with the destination of the MOV. For example: + * + * add vgrf3:F, vgrf1:F, vgrf2:F + * mov vgrf4:F, vgrf3:F + * mul vgrf5:F, vgrf5:F, vgrf4:F + * + * becomes + * + * add vgrf4:F, vgrf1:F, vgrf2:F + * mul vgrf5:F, vgrf5:F, vgrf4:F */ bool fs_visitor::register_coalesce() -- 1.8.3.2 _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/mesa-dev
