diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/mesa/drivers/dri/i965/brw_ir_fs.h | 31 |
1 files changed, 30 insertions, 1 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_ir_fs.h b/src/mesa/drivers/dri/i965/brw_ir_fs.h index e8f1d5353da..9c39a05f4ce 100644 --- a/src/mesa/drivers/dri/i965/brw_ir_fs.h +++ b/src/mesa/drivers/dri/i965/brw_ir_fs.h @@ -146,10 +146,39 @@ component(fs_reg reg, unsigned idx) return reg; } +/** + * Return whether the given register region is n-periodic, i.e. whether the + * original region remains invariant after shifting it by \p n scalar + * channels. + */ +static inline bool +is_periodic(const fs_reg ®, unsigned n) +{ + if (reg.file == BAD_FILE || reg.is_null()) { + return true; + + } else if (reg.file == IMM) { + const unsigned period = (reg.type == BRW_REGISTER_TYPE_UV || + reg.type == BRW_REGISTER_TYPE_V ? 8 : + reg.type == BRW_REGISTER_TYPE_VF ? 4 : + 1); + return n % period == 0; + + } else if (reg.file == ARF || reg.file == FIXED_GRF) { + const unsigned period = (reg.hstride == 0 && reg.vstride == 0 ? 1 : + reg.vstride == 0 ? 1 << reg.width : + ~0); + return n % period == 0; + + } else { + return reg.stride == 0; + } +} + static inline bool is_uniform(const fs_reg ®) { - return (reg.stride == 0 || reg.is_null()); + return is_periodic(reg, 1); } /** |