Mesa (master): i965: add assert to while_jumps_before_offset()

[Timothy Arceri]

Module: Mesa
Branch: master
Commit: 2842dea310e80346a077ec21fe5932875c0d9265
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=2842dea310e80346a077ec21fe5932875c0d9265

Author: Timothy Arceri <t_arceri at yahoo.com.au>
Date:   Thu Jan 26 13:50:42 2017 +1100

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 at whitecape.org>

---

 src/mesa/drivers/dri/i965/brw_eu_emit.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/mesa/drivers/dri/i965/brw_eu_emit.c b/src/mesa/drivers/dri/i965/brw_eu_emit.c
index 257757f..f4bec33 100644
--- 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;
 }