i965: add assert to while_jumps_before_offset()

jip should always be negative here as its the result of
do instruction - while instruction.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

diff --git a/src/mesa/drivers/dri/i965/brw_eu_emit.c b/src/mesa/drivers/dri/i965/brw_eu_emit.c
index 257757f2490bd72a1ff50cbe4815936d352f9d8d..f4bec33f53b76918a09e0e8ad4889f4d90a6ad91 100644 (file)
--- a/src/mesa/drivers/dri/i965/brw_eu_emit.c
+++ b/src/mesa/drivers/dri/i965/brw_eu_emit.c
@@ -2714,6 +2714,7 @@ while_jumps_before_offset(const struct gen_device_info *devinfo,
    int scale = 16 / brw_jump_scale(devinfo);
    int jip = devinfo->gen == 6 ? brw_inst_gen6_jump_count(devinfo, insn)
                                : brw_inst_jip(devinfo, insn);
+   assert(jip < 0);
    return while_offset + jip * scale <= start_offset;
 }