2019-04-22 04:41:09 +01:00
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/*
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* Copyright (C) 2019 Connor Abbott <cwabbott0@gmail.com>
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* Copyright (C) 2019 Lyude Paul <thatslyude@gmail.com>
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* Copyright (C) 2019 Ryan Houdek <Sonicadvance1@gmail.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#ifndef __bifrost_h__
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#define __bifrost_h__
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#include <stdint.h>
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#include <stdbool.h>
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2020-04-30 08:29:10 +01:00
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#define BIFROST_DBG_MSGS 0x0001
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#define BIFROST_DBG_SHADERS 0x0002
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extern int bifrost_debug;
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2020-03-18 17:23:00 +00:00
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enum bifrost_clause_type {
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BIFROST_CLAUSE_NONE = 0,
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BIFROST_CLAUSE_LOAD_VARY = 1,
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BIFROST_CLAUSE_UBO = 2,
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BIFROST_CLAUSE_TEX = 3,
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BIFROST_CLAUSE_SSBO_LOAD = 5,
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BIFROST_CLAUSE_SSBO_STORE = 6,
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BIFROST_CLAUSE_BLEND = 9,
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2020-05-01 16:37:21 +01:00
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BIFROST_CLAUSE_FRAGZ = 12,
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2020-03-18 17:23:00 +00:00
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BIFROST_CLAUSE_ATEST = 13,
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BIFROST_CLAUSE_64BIT = 15
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};
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2019-04-22 04:41:09 +01:00
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struct bifrost_header {
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unsigned unk0 : 7;
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// If true, convert any infinite result of any floating-point operation to
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// the biggest representable number.
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unsigned suppress_inf: 1;
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// Convert any NaN results to 0.
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unsigned suppress_nan : 1;
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unsigned unk1 : 2;
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// true if the execution mask of the next clause is the same as the mask of
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// the current clause.
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unsigned back_to_back : 1;
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unsigned no_end_of_shader: 1;
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unsigned unk2 : 2;
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// Set to true for fragment shaders, to implement this bit of spec text
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// from section 7.1.5 of the GLSL ES spec:
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//
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// "Stores to image and buffer variables performed by helper invocations
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// have no effect on the underlying image or buffer memory."
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//
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// Helper invocations are threads (invocations) corresponding to pixels in
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// a quad that aren't actually part of the triangle, but are included to
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// make derivatives work correctly. They're usually turned on, but they
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// need to be masked off for GLSL-level stores. This bit seems to be the
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// only bit that's actually different between fragment shaders and other
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// shaders, so this is probably what it's doing.
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unsigned elide_writes : 1;
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// If backToBack is off:
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// - true for conditional branches and fallthrough
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// - false for unconditional branches
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// The blob seems to always set it to true if back-to-back is on.
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unsigned branch_cond : 1;
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// This bit is set when the next clause writes to the data register of some
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// previous clause.
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unsigned datareg_writebarrier: 1;
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unsigned datareg : 6;
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unsigned scoreboard_deps: 8;
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unsigned scoreboard_index: 3;
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2020-03-18 17:23:00 +00:00
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enum bifrost_clause_type clause_type: 4;
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2019-04-22 04:41:09 +01:00
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unsigned unk3 : 1; // part of clauseType?
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2020-03-18 17:23:00 +00:00
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enum bifrost_clause_type next_clause_type: 4;
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2019-04-22 04:41:09 +01:00
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unsigned unk4 : 1; // part of nextClauseType?
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2020-03-18 02:42:54 +00:00
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} __attribute__((packed));
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2019-04-22 04:41:09 +01:00
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2020-03-18 13:57:32 +00:00
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enum bifrost_packed_src {
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BIFROST_SRC_PORT0 = 0,
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BIFROST_SRC_PORT1 = 1,
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BIFROST_SRC_PORT3 = 2,
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BIFROST_SRC_STAGE = 3,
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BIFROST_SRC_CONST_LO = 4,
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BIFROST_SRC_CONST_HI = 5,
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BIFROST_SRC_PASS_FMA = 6,
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BIFROST_SRC_PASS_ADD = 7,
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};
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2019-04-22 04:41:09 +01:00
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struct bifrost_fma_inst {
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unsigned src0 : 3;
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unsigned op : 20;
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2020-03-18 02:42:54 +00:00
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} __attribute__((packed));
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2019-04-22 04:41:09 +01:00
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struct bifrost_add_inst {
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unsigned src0 : 3;
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unsigned op : 17;
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2020-03-18 02:42:54 +00:00
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} __attribute__((packed));
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2019-04-22 04:41:09 +01:00
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2020-03-02 21:42:36 +00:00
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enum bifrost_outmod {
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BIFROST_NONE = 0x0,
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BIFROST_POS = 0x1,
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BIFROST_SAT_SIGNED = 0x2,
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BIFROST_SAT = 0x3,
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};
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enum bifrost_roundmode {
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2020-03-03 20:39:04 +00:00
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BIFROST_RTE = 0x0, /* round to even */
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BIFROST_RTP = 0x1, /* round to positive */
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BIFROST_RTN = 0x2, /* round to negative */
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BIFROST_RTZ = 0x3 /* round to zero */
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2020-03-02 21:42:36 +00:00
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};
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2020-03-03 20:39:04 +00:00
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/* NONE: Same as fmax() and fmin() -- return the other
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* number if any number is NaN. Also always return +0 if
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* one argument is +0 and the other is -0.
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*
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* NAN_WINS: Instead of never returning a NaN, always return
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* one. The "greater"/"lesser" NaN is always returned, first
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* by checking the sign and then the mantissa bits.
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*
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* SRC1_WINS: For max, implement src0 > src1 ? src0 : src1.
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* For min, implement src0 < src1 ? src0 : src1. This
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* includes handling NaN's and signedness of 0 differently
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* from above, since +0 and -0 compare equal and comparisons
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* always return false for NaN's. As a result, this mode is
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* *not* commutative.
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*
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* SRC0_WINS: For max, implement src0 < src1 ? src1 : src0
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* For min, implement src0 > src1 ? src1 : src0
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*/
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2020-03-03 01:51:03 +00:00
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enum bifrost_minmax_mode {
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BIFROST_MINMAX_NONE = 0x0,
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BIFROST_NAN_WINS = 0x1,
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BIFROST_SRC1_WINS = 0x2,
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BIFROST_SRC0_WINS = 0x3,
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};
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2020-03-03 02:45:47 +00:00
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enum bifrost_interp_mode {
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BIFROST_INTERP_PER_FRAG = 0x0,
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BIFROST_INTERP_CENTROID = 0x1,
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BIFROST_INTERP_DEFAULT = 0x2,
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BIFROST_INTERP_EXPLICIT = 0x3
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};
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2020-05-01 19:55:04 +01:00
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/* Fixed location for gl_FragCoord.zw */
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#define BIFROST_FRAGZ (23)
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#define BIFROST_FRAGW (22)
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2020-03-02 21:45:15 +00:00
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enum branch_bit_size {
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BR_SIZE_32 = 0,
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BR_SIZE_16XX = 1,
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BR_SIZE_16YY = 2,
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// For the above combinations of bitsize and location, an extra bit is
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// encoded via comparing the sources. The only possible source of ambiguity
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// would be if the sources were the same, but then the branch condition
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// would be always true or always false anyways, so we can ignore it. But
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// this no longer works when comparing the y component to the x component,
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// since it's valid to compare the y component of a source against its own
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// x component. Instead, the extra bit is encoded via an extra bitsize.
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BR_SIZE_16YX0 = 3,
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BR_SIZE_16YX1 = 4,
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BR_SIZE_32_AND_16X = 5,
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BR_SIZE_32_AND_16Y = 6,
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// Used for comparisons with zero and always-true, see below. I think this
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// only works for integer comparisons.
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BR_SIZE_ZERO = 7,
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};
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enum bifrost_reg_write_unit {
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REG_WRITE_NONE = 0, // don't write
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REG_WRITE_TWO, // write using reg2
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REG_WRITE_THREE, // write using reg3
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};
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struct bifrost_regs {
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unsigned uniform_const : 8;
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unsigned reg3 : 6;
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2020-09-20 14:53:14 +01:00
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unsigned reg2 : 6;
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2020-03-02 21:45:15 +00:00
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unsigned reg0 : 5;
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unsigned reg1 : 6;
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unsigned ctrl : 4;
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2020-03-18 02:42:54 +00:00
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} __attribute__((packed));
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2020-03-02 21:45:15 +00:00
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2020-03-03 00:30:11 +00:00
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enum bifrost_branch_cond {
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BR_COND_LT = 0,
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BR_COND_LE = 1,
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BR_COND_GE = 2,
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BR_COND_GT = 3,
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// Equal vs. not-equal determined by src0/src1 comparison
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BR_COND_EQ = 4,
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// floating-point comparisons
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// Becomes UNE when you flip the arguments
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BR_COND_OEQ = 5,
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// TODO what happens when you flip the arguments?
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BR_COND_OGT = 6,
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BR_COND_OLT = 7,
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};
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enum bifrost_branch_code {
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BR_ALWAYS = 63,
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};
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2020-05-28 17:39:42 +01:00
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#define BIFROST_ADD_OP_BRANCH (0x0d000 >> 12)
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2020-03-03 18:47:49 +00:00
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struct bifrost_branch {
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unsigned src0 : 3;
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/* For BR_SIZE_ZERO, upper two bits become ctrl */
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unsigned src1 : 3;
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/* Offset source -- always uniform/const but
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* theoretically could support indirect jumps? */
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unsigned src2 : 3;
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enum bifrost_branch_cond cond : 3;
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enum branch_bit_size size : 3;
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unsigned op : 5;
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};
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2020-03-12 18:16:22 +00:00
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/* Clause packing */
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struct bifrost_fmt1 {
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unsigned ins_0 : 3;
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unsigned tag : 5;
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uint64_t ins_1 : 64;
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unsigned ins_2 : 11;
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uint64_t header : 45;
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} __attribute__((packed));
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#define BIFROST_FMT1_INSTRUCTIONS 0b00101
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#define BIFROST_FMT1_FINAL 0b01001
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#define BIFROST_FMT1_CONSTANTS 0b00001
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2020-03-20 01:45:18 +00:00
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#define BIFROST_FMTC_CONSTANTS 0b0011
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#define BIFROST_FMTC_FINAL 0b0111
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struct bifrost_fmt_constant {
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unsigned pos : 4;
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unsigned tag : 4;
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uint64_t imm_1 : 60;
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uint64_t imm_2 : 60;
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} __attribute__((packed));
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2020-03-18 01:35:44 +00:00
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enum bifrost_reg_control {
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BIFROST_WRITE_FMA_P2 = 1,
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BIFROST_WRITE_FMA_P2_READ_P3 = 2,
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2020-04-01 23:22:01 +01:00
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BIFROST_FIRST_WRITE_FMA_P2_READ_P3 = 3,
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2020-03-18 01:35:44 +00:00
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BIFROST_READ_P3 = 4,
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BIFROST_WRITE_ADD_P2 = 5,
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BIFROST_WRITE_ADD_P2_READ_P3 = 6,
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BIFROST_WRITE_ADD_P2_FMA_P3 = 7,
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BIFROST_FIRST_NONE = 8,
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BIFROST_FIRST_WRITE_FMA_P2 = 9,
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2020-04-01 23:22:01 +01:00
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/* INSTR_INVALID_ENC */
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2020-03-18 01:35:44 +00:00
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BIFROST_REG_NONE = 11,
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BIFROST_FIRST_READ_P3 = 12,
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BIFROST_FIRST_WRITE_ADD_P2 = 13,
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BIFROST_FIRST_WRITE_ADD_P2_READ_P3 = 14,
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BIFROST_FIRST_WRITE_ADD_P2_FMA_P3 = 15
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};
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2020-09-20 14:22:20 +01:00
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/* 32-bit modes for slots 2/3, as encoded in the register block. Other values
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* are reserved. First part specifies behaviour of slot 2 (Idle, Read, Write
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* Full, Write Low, Write High), second part behaviour of slot 3, and the last
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* part specifies the source for the write (FMA, ADD, or MIX for FMA/ADD).
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*
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2020-09-20 20:34:38 +01:00
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* IDLE is a special mode disabling both slots, except for the first
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2020-09-20 14:22:20 +01:00
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* instruction in the clause which uses IDLE_1 for the same purpose.
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2020-09-20 14:53:14 +01:00
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*
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* All fields 0 used as sentinel for reserved encoding, so IDLE(_1) have FMA
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* set (and ignored) as a placeholder to differentiate from reserved.
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2020-09-20 14:22:20 +01:00
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*/
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enum bifrost_reg_mode {
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BIFROST_R_WL_FMA = 1,
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BIFROST_R_WH_FMA = 2,
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BIFROST_R_W_FMA = 3,
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BIFROST_R_WL_ADD = 4,
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BIFROST_R_WH_ADD = 5,
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BIFROST_R_W_ADD = 6,
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BIFROST_WL_WL_ADD = 7,
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BIFROST_WL_WH_ADD = 8,
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BIFROST_WL_W_ADD = 9,
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BIFROST_WH_WL_ADD = 10,
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BIFROST_WH_WH_ADD = 11,
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BIFROST_WH_W_ADD = 12,
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BIFROST_W_WL_ADD = 13,
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BIFROST_W_WH_ADD = 14,
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BIFROST_W_W_ADD = 15,
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BIFROST_IDLE_1 = 16,
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BIFROST_I_W_FMA = 17,
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BIFROST_I_WL_FMA = 18,
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BIFROST_I_WH_FMA = 19,
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BIFROST_R_I = 20,
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BIFROST_I_W_ADD = 21,
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BIFROST_I_WL_ADD = 22,
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BIFROST_I_WH_ADD = 23,
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BIFROST_WL_WH_MIX = 24,
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BIFROST_WH_WL_MIX = 26,
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BIFROST_IDLE = 27,
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};
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2020-09-20 14:53:14 +01:00
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enum bifrost_reg_op {
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BIFROST_OP_IDLE = 0,
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BIFROST_OP_READ = 1,
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BIFROST_OP_WRITE = 2,
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BIFROST_OP_WRITE_LO = 3,
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BIFROST_OP_WRITE_HI = 4,
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};
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struct bifrost_reg_ctrl_23 {
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enum bifrost_reg_op slot2;
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enum bifrost_reg_op slot3;
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bool slot3_fma;
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};
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static const struct bifrost_reg_ctrl_23 bifrost_reg_ctrl_lut[32] = {
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[BIFROST_R_WL_FMA] = { BIFROST_OP_READ, BIFROST_OP_WRITE_LO, true },
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[BIFROST_R_WH_FMA] = { BIFROST_OP_READ, BIFROST_OP_WRITE_HI, true },
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[BIFROST_R_W_FMA] = { BIFROST_OP_READ, BIFROST_OP_WRITE, true },
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[BIFROST_R_WL_ADD] = { BIFROST_OP_READ, BIFROST_OP_WRITE_LO, false },
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[BIFROST_R_WH_ADD] = { BIFROST_OP_READ, BIFROST_OP_WRITE_HI, false },
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[BIFROST_R_W_ADD] = { BIFROST_OP_READ, BIFROST_OP_WRITE, false },
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[BIFROST_WL_WL_ADD] = { BIFROST_OP_WRITE_LO, BIFROST_OP_WRITE_LO, false },
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[BIFROST_WL_WH_ADD] = { BIFROST_OP_WRITE_LO, BIFROST_OP_WRITE_HI, false },
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[BIFROST_WL_W_ADD] = { BIFROST_OP_WRITE_LO, BIFROST_OP_WRITE, false },
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[BIFROST_WH_WL_ADD] = { BIFROST_OP_WRITE_HI, BIFROST_OP_WRITE_LO, false },
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[BIFROST_WH_WH_ADD] = { BIFROST_OP_WRITE_HI, BIFROST_OP_WRITE_HI, false },
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[BIFROST_WH_W_ADD] = { BIFROST_OP_WRITE_HI, BIFROST_OP_WRITE, false },
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[BIFROST_W_WL_ADD] = { BIFROST_OP_WRITE, BIFROST_OP_WRITE_LO, false },
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[BIFROST_W_WH_ADD] = { BIFROST_OP_WRITE, BIFROST_OP_WRITE_HI, false },
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[BIFROST_W_W_ADD] = { BIFROST_OP_WRITE, BIFROST_OP_WRITE, false },
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[BIFROST_IDLE_1] = { BIFROST_OP_IDLE, BIFROST_OP_IDLE, true },
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[BIFROST_I_W_FMA] = { BIFROST_OP_IDLE, BIFROST_OP_WRITE, true },
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[BIFROST_I_WL_FMA] = { BIFROST_OP_IDLE, BIFROST_OP_WRITE_LO, true },
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[BIFROST_I_WH_FMA] = { BIFROST_OP_IDLE, BIFROST_OP_WRITE_HI, true },
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[BIFROST_R_I] = { BIFROST_OP_READ, BIFROST_OP_IDLE, false },
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[BIFROST_I_W_ADD] = { BIFROST_OP_IDLE, BIFROST_OP_WRITE, false },
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[BIFROST_I_WL_ADD] = { BIFROST_OP_IDLE, BIFROST_OP_WRITE_LO, false },
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[BIFROST_I_WH_ADD] = { BIFROST_OP_IDLE, BIFROST_OP_WRITE_HI, false },
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[BIFROST_WL_WH_MIX] = { BIFROST_OP_WRITE_LO, BIFROST_OP_WRITE_HI, false },
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[BIFROST_WH_WL_MIX] = { BIFROST_OP_WRITE_HI, BIFROST_OP_WRITE_LO, false },
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[BIFROST_IDLE] = { BIFROST_OP_IDLE, BIFROST_OP_IDLE, true },
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};
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2019-04-22 04:41:09 +01:00
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#endif
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