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/*
* Copyright © 2015 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#pragma once
#include "glsl/nir/nir.h"
#ifdef __cplusplus
extern "C" {
#endif
/* Flags set in the instr->pass_flags field by i965 analysis passes */
enum {
BRW_NIR_NON_BOOLEAN = 0x0,
/* Indicates that the given instruction's destination is a boolean
* value but that it needs to be resolved before it can be used.
* On Gen <= 5, CMP instructions return a 32-bit value where the bottom
* bit represents the actual true/false value of the compare and the top
* 31 bits are undefined. In order to use this value, we have to do a
* "resolve" operation by replacing the value of the CMP with -(x & 1)
* to sign-extend the bottom bit to 0/~0.
*/
BRW_NIR_BOOLEAN_NEEDS_RESOLVE = 0x1,
/* Indicates that the given instruction's destination is a boolean
* value that has intentionally been left unresolved. Not all boolean
* values need to be resolved immediately. For instance, if we have
*
* CMP r1 r2 r3
* CMP r4 r5 r6
* AND r7 r1 r4
*
* We don't have to resolve the result of the two CMP instructions
* immediately because the AND still does an AND of the bottom bits.
* Instead, we can save ourselves instructions by delaying the resolve
* until after the AND. The result of the two CMP instructions is left
* as BRW_NIR_BOOLEAN_UNRESOLVED.
*/
BRW_NIR_BOOLEAN_UNRESOLVED = 0x2,
/* Indicates a that the given instruction's destination is a boolean
* value that does not need a resolve. For instance, if you AND two
* values that are BRW_NIR_BOOLEAN_NEEDS_RESOLVE then we know that both
* values will be 0/~0 before we get them and the result of the AND is
* also guaranteed to be 0/~0 and does not need a resolve.
*/
BRW_NIR_BOOLEAN_NO_RESOLVE = 0x3,
/* A mask to mask the boolean status values off of instr->pass_flags */
BRW_NIR_BOOLEAN_MASK = 0x3,
};
void brw_nir_analyze_boolean_resolves(nir_shader *nir);
#ifdef __cplusplus
}
#endif
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