Module: Mesa Branch: master Commit: 9c57780dc0604f871650c5d23c06d627d964d803 URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=9c57780dc0604f871650c5d23c06d627d964d803
Author: Eric Anholt <[email protected]> Date: Mon Mar 28 11:29:55 2011 -0700 i965/fs: Add support for compr4 MRF writes. These reduce an emitted (not decoded) instruction per shader on g4x/gen5, but may allow for additional register coalescing as well. Reviewed-by: Kenneth Graunke <[email protected]> --- src/mesa/drivers/dri/i965/brw_fs.cpp | 34 +++++++++++++++++++--------------- 1 files changed, 19 insertions(+), 15 deletions(-) diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp index 4e3adbc..2784e0d 100644 --- a/src/mesa/drivers/dri/i965/brw_fs.cpp +++ b/src/mesa/drivers/dri/i965/brw_fs.cpp @@ -2073,22 +2073,26 @@ fs_visitor::emit_color_write(int index, int first_color_mrf, fs_reg color) * m + 5: g1 * m + 6: b1 * m + 7: a1 - * - * By setting the high bit of the MRF register number, - * we could indicate that we want COMPR4 mode - instead - * of doing the usual destination + 1 for the second - * half we would get destination + 4. We would need to - * clue the optimizer into that, though. */ - push_force_uncompressed(); - emit(BRW_OPCODE_MOV, fs_reg(MRF, first_color_mrf + index), color); - pop_force_uncompressed(); + if (brw->has_compr4) { + /* By setting the high bit of the MRF register number, we + * indicate that we want COMPR4 mode - instead of doing the + * usual destination + 1 for the second half we get + * destination + 4. + */ + emit(BRW_OPCODE_MOV, + fs_reg(MRF, BRW_MRF_COMPR4 + first_color_mrf + index), color); + } else { + push_force_uncompressed(); + emit(BRW_OPCODE_MOV, fs_reg(MRF, first_color_mrf + index), color); + pop_force_uncompressed(); - push_force_sechalf(); - color.sechalf = true; - emit(BRW_OPCODE_MOV, fs_reg(MRF, first_color_mrf + index + 4), color); - pop_force_sechalf(); - color.sechalf = false; + push_force_sechalf(); + color.sechalf = true; + emit(BRW_OPCODE_MOV, fs_reg(MRF, first_color_mrf + index + 4), color); + pop_force_sechalf(); + color.sechalf = false; + } } } _______________________________________________ mesa-commit mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/mesa-commit
