diff options
| author | Matt Turner <[email protected]> | 2014-03-11 13:07:42 -0700 |
|---|---|---|
| committer | Matt Turner <[email protected]> | 2014-03-24 11:06:26 -0700 |
| commit | 89ccd11eebeee884d581e831b61368ac97057b43 (patch) | |
| tree | ee6ec43d507c73ef0ff7de2830a24a87ef2ddece /src/mesa/drivers/dri/i965/brw_vec4.cpp | |
| parent | 3a12f50f9ca7f03f470ee053b9076ac12c4d486d (diff) | |
i965/vec4: Don't dead code eliminate instructions writing the flag.
A future patch adds support for removing dead writes to the flag
register. This patch simplifies the logic until then.
total instructions in shared programs: 811813 -> 811869 (0.01%)
instructions in affected programs: 3378 -> 3434 (1.66%)
Reviewed-by: Eric Anholt <[email protected]>
Diffstat (limited to 'src/mesa/drivers/dri/i965/brw_vec4.cpp')
| -rw-r--r-- | src/mesa/drivers/dri/i965/brw_vec4.cpp | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_vec4.cpp b/src/mesa/drivers/dri/i965/brw_vec4.cpp index cb87fecf8d8..d07e8c558c2 100644 --- a/src/mesa/drivers/dri/i965/brw_vec4.cpp +++ b/src/mesa/drivers/dri/i965/brw_vec4.cpp @@ -356,7 +356,11 @@ vec4_visitor::dead_code_eliminate() inst->dst = dst_reg(retype(brw_null_reg(), inst->dst.type)); break; default: - inst->remove(); + if (inst->writes_flag()) { + inst->dst = dst_reg(retype(brw_null_reg(), inst->dst.type)); + } else { + inst->remove(); + } break; } progress = true; |