On Tuesday, June 12, 2018 1:38:03 PM PDT Rafael Antognolli wrote: > On Mon, Jun 11, 2018 at 02:01:49PM -0700, Kenneth Graunke wrote: > > The UBO push analysis pass incorrectly assumed that all values would fit > > within a 32B chunk, and only recorded a bit for the 32B chunk containing > > the starting offset. > > > > For example, if a UBO contained the following, tightly packed: > > > > vec4 a; // [0, 16) > > float b; // [16, 20) > > vec4 c; // [20, 36) > > > > then, c would start at offset 20 / 32 = 0 and end at 36 / 32 = 1, > > which means that we ought to record two 32B chunks in the bitfield. > > > > Similarly, dvec4s would suffer from the same problem. > > --- > > src/intel/compiler/brw_nir_analyze_ubo_ranges.c | 8 +++++++- > > 1 file changed, 7 insertions(+), 1 deletion(-) > > > > diff --git a/src/intel/compiler/brw_nir_analyze_ubo_ranges.c > > b/src/intel/compiler/brw_nir_analyze_ubo_ranges.c > > index d58fe3dd2e3..6d6ccf73ade 100644 > > --- a/src/intel/compiler/brw_nir_analyze_ubo_ranges.c > > +++ b/src/intel/compiler/brw_nir_analyze_ubo_ranges.c > > @@ -141,10 +141,16 @@ analyze_ubos_block(struct ubo_analysis_state *state, > > nir_block *block) > > if (offset >= 64) > > continue; > > > > + /* The value might span multiple 32-byte chunks. */ > > + const int bytes = nir_intrinsic_dest_components(intrin) * > > + (nir_dest_bit_size(intrin->dest) / 8); > > + const int end = DIV_ROUND_UP(offset_const->u32[0] + bytes, 32); > > + const int regs = end - offset + 1; > > + > > But if I understood it correctly, offset is the first 32B chunk within > the UBO block (it's actually an ubo "chunk offset"). And you calculate > bytes by taking the number of components times the size of each > component of the nir_intrinsic_load_ubo instruction (which apparently > supports multiple components). So yeah, this makes sense to me.
Yeah, that's exactly right. load_ubo can load up to 4 components. > Take this review with a grain of salt (assuming what I wrote above is > correct), but this looks simple enough. So it is > > Reviewed-by: Rafael Antognolli <rafael.antogno...@intel.com> Thanks!
signature.asc
Description: This is a digitally signed message part.
_______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/mesa-dev
