nir: allow reordering of loads from read-only modes
fossil-db (Navi): Totals from 710 (0.51% of 138917) affected shaders: SGPRs: 45007 -> 44791 (-0.48%) VGPRs: 36116 -> 36284 (+0.47%); split: -0.03%, +0.50% CodeSize: 3811540 -> 3795332 (-0.43%); split: -0.43%, +0.00% MaxWaves: 8018 -> 8005 (-0.16%) Instrs: 758383 -> 755084 (-0.44%); split: -0.44%, +0.01% Cycles: 5786240 -> 5758848 (-0.47%); split: -0.48%, +0.00% Signed-off-by: Rhys Perry <pendingchaos02@gmail.com> Reviewed-by: Daniel Schürmann <daniel@schuermann.dev> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7600>
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@ -2161,11 +2161,14 @@ void nir_rewrite_image_intrinsic(nir_intrinsic_instr *instr,
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static inline bool
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nir_intrinsic_can_reorder(nir_intrinsic_instr *instr)
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{
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if (instr->intrinsic == nir_intrinsic_load_deref ||
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instr->intrinsic == nir_intrinsic_load_ssbo ||
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instr->intrinsic == nir_intrinsic_bindless_image_load ||
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instr->intrinsic == nir_intrinsic_image_deref_load ||
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instr->intrinsic == nir_intrinsic_image_load) {
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if (instr->intrinsic == nir_intrinsic_load_deref) {
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nir_deref_instr *deref = nir_src_as_deref(instr->src[0]);
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return nir_deref_mode_is_in_set(deref, nir_var_read_only_modes) ||
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(nir_intrinsic_access(instr) & ACCESS_CAN_REORDER);
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} else if (instr->intrinsic == nir_intrinsic_load_ssbo ||
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instr->intrinsic == nir_intrinsic_bindless_image_load ||
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instr->intrinsic == nir_intrinsic_image_deref_load ||
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instr->intrinsic == nir_intrinsic_image_load) {
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return nir_intrinsic_access(instr) & ACCESS_CAN_REORDER;
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} else {
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const nir_intrinsic_info *info =
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