diff options
| author | Connor Abbott <[email protected]> | 2015-01-25 11:42:34 -0500 |
|---|---|---|
| committer | Connor Abbott <[email protected]> | 2015-01-26 21:26:36 -0500 |
| commit | 816f0515a2ca2dbacada24f7f79d65daf5c0fcf5 (patch) | |
| tree | 180b7f6a66f53673a508f3c0dd1191f8d799325b | |
| parent | 90bd943f2abafd5e3ea29ab8397fd4682ef74170 (diff) | |
nir: add a helper function for getting the number of source components
Unlike with non-SSA ALU instructions, where if they're per-component
you have to look at the writemask to know which source channels are
being used, SSA ALU instructions always have all the possible channels
enabled so we can just look at the number of components in the SSA
definition for per-component instructions to say how many source
components are being used.
v2: use new name nir_ssa_alu_instr_src_components()
Reviewed-by: Jason Ekstrand <[email protected]>
Signed-off-by: Connor Abbott <[email protected]>
| -rw-r--r-- | src/glsl/nir/nir.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/src/glsl/nir/nir.h b/src/glsl/nir/nir.h index 3fb9d3b5fbe..980fdd08f33 100644 --- a/src/glsl/nir/nir.h +++ b/src/glsl/nir/nir.h @@ -652,6 +652,21 @@ nir_alu_instr_channel_used(nir_alu_instr *instr, unsigned src, unsigned channel) return (instr->dest.write_mask >> channel) & 1; } +/* + * For instructions whose destinations are SSA, get the number of channels + * used for a source + */ +static inline unsigned +nir_ssa_alu_instr_src_components(nir_alu_instr *instr, unsigned src) +{ + assert(instr->dest.dest.is_ssa); + + if (nir_op_infos[instr->op].input_sizes[src] > 0) + return nir_op_infos[instr->op].input_sizes[src]; + + return instr->dest.dest.ssa.num_components; +} + typedef enum { nir_deref_type_var, nir_deref_type_array, |