i965/vec4: don't copy propagate misaligned registers
This means we would copy propagate partial reads or writes and that can affect
the result.
Signed-off-by: Samuel Iglesias Gonsálvez <siglesias@igalia.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
diff --git a/src/mesa/drivers/dri/i965/brw_vec4_copy_propagation.cpp b/src/mesa/drivers/dri/i965/brw_vec4_copy_propagation.cpp
index 9b76f58..e7f6f93 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4_copy_propagation.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4_copy_propagation.cpp
@@ -354,6 +354,9 @@
return false;
}
+ if (inst->src[arg].offset % REG_SIZE || value.offset % REG_SIZE)
+ return false;
+
bool has_source_modifiers = value.negate || value.abs;
/* gen6 math and gen7+ SENDs from GRFs ignore source modifiers on
