This will be useful in the SIMD lowering pass. --- src/mesa/drivers/dri/i965/brw_ir_fs.h | 28 +++++++++++++++++++++++++++- 1 file changed, 27 insertions(+), 1 deletion(-)
diff --git a/src/mesa/drivers/dri/i965/brw_ir_fs.h b/src/mesa/drivers/dri/i965/brw_ir_fs.h index e8f1d53..79c7eed 100644 --- a/src/mesa/drivers/dri/i965/brw_ir_fs.h +++ b/src/mesa/drivers/dri/i965/brw_ir_fs.h @@ -146,10 +146,36 @@ 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 == 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); } /** -- 2.7.3 _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/mesa-dev