Currently the generator code for most opcodes honours the default
access mode (which should typically be Align1 in the scalar back-end),
but generate_code() doesn't set it explicitly which means that the
access mode from a previous instruction could leak into the following
ones if you did something special and weren't careful enough to save
and restore the previous access mode.
---
src/mesa/drivers/dri/i965/brw_fs_generator.cpp | 1 +
1 file changed, 1 insertion(+)
diff --git a/src/mesa/drivers/dri/i965/brw_fs_generator.cpp
b/src/mesa/drivers/dri/i965/brw_fs_generator.cpp
index bfbcfa2..652696d 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_generator.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_generator.cpp
@@ -1698,6 +1698,7 @@ fs_generator::generate_code(const cfg_t *cfg, int
dispatch_width)
}
dst = brw_reg_from_fs_reg(p, inst, &inst->dst, devinfo->gen);
+ brw_set_default_access_mode(p, BRW_ALIGN_1);
brw_set_default_predicate_control(p, inst->predicate);
brw_set_default_predicate_inverse(p, inst->predicate_inverse);
brw_set_default_flag_reg(p, 0, inst->flag_subreg);
--
2.7.3
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