Quelle gfx_v11_0_3_cleaner_shader.asm
Sprache: Masm
/* SPDX-License-Identifier: MIT */
/*
* Copyright 2024 Advanced Micro Devices, Inc.
*
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* copy of this software and associated documentation files (the "Software"),
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* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice andthis permission notice shall be included in
* all copies or substantial portions of the Software.
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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*/
// This shader is to clean LDS, SGPRs and VGPRs. It is first 64 Dwords or 256 bytes of 192 Dwords cleaner shader.
//To turn this shader program on for complitaion change this to main and lower shader main to main_1
// Navi3 : Clear SGPRs, VGPRs and LDS
// Launch 32 waves per CU (16 per SIMD) as a workgroup (threadgroup) to fill every wave slot
// Waves are "wave32"and have 64 VGPRs each, which uses all 1024 VGPRs per SIMD
// Waves are launched in "CU" mode, and the workgroup shares 64KB of LDS (half of the WGP's LDS)
// It takes 2 workgroups to use all of LDS: one on each CU of the WGP
// Each wave clears SGPRs 0 - 107
// Each wave clears VGPRs 0 - 63
// The first wave of the workgroup clears its 64KB of LDS
// The shader starts with "S_BARRIER" to ensure SPI has launched all waves of the workgroup
// before any wave in the workgroup could end. Without this, it is possible not all SGPRs get cleared.
shader main
asic(GFX11)
type(CS)
wave_size(32)
// Note: original source code from SQ team
// Takes about 2500 clocks to run.
// (theorhetical fastest = 1024clks vgpr + 640lds = 1660 clks)
//
S_BARRIER
//
// CLEAR VGPRs
//
s_mov_b32 m0, 0x00000058 // Loop 96/8=12 times (loop unrolled for performance)
s_mov_b32 s2, 0x80000000 // Bit31 is first_wave
s_and_b32 s2, s2, s0 // sgpr0 has tg_size (first_wave) term as in ucode only COMPUTE_PGM_RSRC2.tg_size_en is set
s_cbranch_scc0 label_0023 // Clean LDS if its first wave of ThreadGroup/WorkGroup
// CLEAR LDS
//
s_mov_b32 exec_lo, 0xffffffff
s_mov_b32 exec_hi, 0xffffffff
v_mbcnt_lo_u32_b32 v1, exec_hi, 0 // Set V1 to thread-ID (0..63)
v_mbcnt_hi_u32_b32 v1, exec_lo, v1 // Set V1 to thread-ID (0..63)
v_mul_u32_u24 v1, 0x00000008, v1 // * 8, so each thread is a double-dword address (8byte)
s_mov_b32 s2, 0x00000003f // 64 loop iterations
s_mov_b32 m0, 0xffffffff
// Clear all of LDS space
// Each FirstWave of WorkGroup clears 64kbyte block
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