diff options
Diffstat (limited to 'src/mesa/drivers/dri/i965/brw_fs_copy_propagation.cpp')
| -rw-r--r-- | src/mesa/drivers/dri/i965/brw_fs_copy_propagation.cpp | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_fs_copy_propagation.cpp b/src/mesa/drivers/dri/i965/brw_fs_copy_propagation.cpp index 54e9114..269bdb5 100644 --- a/src/mesa/drivers/dri/i965/brw_fs_copy_propagation.cpp +++ b/src/mesa/drivers/dri/i965/brw_fs_copy_propagation.cpp @@ -339,6 +339,14 @@ fs_visitor::try_copy_propagate(fs_inst *inst, int arg, acp_entry *entry) if (entry->src.stride * inst->src[arg].stride > 4) return false; + /* Bail if the instruction type is larger than the execution type of the + * copy, what implies that each channel is reading multiple channels of the + * destination of the copy, and simply replacing the sources would give a + * program with different semantics. + */ + if (type_sz(entry->dst.type) < type_sz(inst->src[arg].type)) + return false; + /* Bail if the result of composing both strides cannot be expressed * as another stride. This avoids, for example, trying to transform * this: |