HLS Optimization: Pipeline V.S. Unroll

最新推荐文章于 2022-09-03 18:45:00 发布
最新推荐文章于 2022-09-03 18:45:00 发布
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原文链接：http://www.cnblogs.com/wordchao/p/10947470.html
博客介绍了PIPELINE和UNROLL的功能。PIPELINE可减少启动间隔，允许循环或函数内操作并发执行；UNROLL则用于展开for循环，创建多个独立操作而非单一操作集合。

PIPELINE:

  • Reduces the initiation interval
  • Concurrent execution

UNROLL:

  • Unroll for-loops
  • Multiple independent operations

 

PIPELINE: Reduces the initiation interval by allowing the concurrent
execution of operations within a loop or function.

UNROLL: Unroll for-loops to create multiple independent operations
rather than a single collection of operations.

转载于:https://www.cnblogs.com/wordchao/p/10947470.html

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非完美循环中，内层和外层循环没有合并，只有内层循环LOOP_J 实现了流水线执行，进出内循环的浪费的时钟周期增加了整个循环的时钟周期，同时还有一些命令行没有办法跨越循环的层级实现调度上的优化，这些因素都导致了设计的延迟的增加。在循环流水线优化的过程中，有一个完美循环，半完美循环和非完美循环的代码风格概念，只有当流水线循环完美或半完美时，才可以将嵌套循环彻底并行展开。只有最里面的循环才具有主体 (内容), 在循环语句之间没有指定逻辑，只有最外面的循环边界可以是可变的。
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unroll，如下代码所示，unroll是将for循环zhong的代码展开成8份，也相当于使用8倍的资源去实现这个结构。factor指定的unroll份数必须是可以被循环次数整除的数。factor也可以省略，default时unroll份数就是循环次数。 for(int i=0;i<16;i++){ #pragma HLS unroll factor=8 x[i] = y[i]; }...
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【 声明：版权所有，欢迎转载，请勿用于商业用途。 联系信箱：feixiaoxing @163.com】 hls里面除了提供了c、c++的编辑、综合功能之外，还提供了很多与之配套的功能，比如说testbench、co-sim、open wave viewer、compare report等等。这些都是分析fpga效果的利器。大家在学习hls的时候，要时刻记得是，我们编写的不是代码，其实是电路，和verilog一样的电路。言归正传，今天还是看一下hls里面unroll是怎么使用的。 1、简单多项式计算 void
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一、循环优化 Pipeline:流水线操作 iteration latency:每次循环迭代所需要的时钟周期数 2.Unroll:循环展开 每一个循环都时分复用同一个电路，循环展开相当于把该电路进行逻辑复制 二、数组分割 dim=1,表示该数组是一维数组； ...
INFO: [HLS 214-291] Loop 'VITIS_LOOP_56_2' is marked as complete unroll implied by the pipeline pragma (src/SmoothProfileOnXAxisMeanOptimize.cpp:56:19) INFO: [HLS 214-291] Loop 'VITIS_LOOP_43_1' is marked as complete unroll implied by the pipeline pragma (src/SmoothProfileOnXAxisMeanOptimize.cpp:43:19) INFO: [HLS 214-186] Unrolling loop 'VITIS_LOOP_56_2' (src/SmoothProfileOnXAxisMeanOptimize.cpp:56:19) in function 'SmoothProfileOnXAxisMeanOptimize' completely with a factor of 11 (src/SmoothProfileOnXAxisMeanOptimize.cpp:15:0) INFO: [HLS 214-186] Unrolling loop 'VITIS_LOOP_43_1' (src/SmoothProfileOnXAxisMeanOptimize.cpp:43:19) in function 'SmoothProfileOnXAxisMeanOptimize' completely with a factor of 32 (src/SmoothProfileOnXAxisMeanOptimize.cpp:15:0) INFO: [HLS 214-248] Applying array_partition to '_ZZ32SmoothProfileOnXAxisMeanOptimizeRN3hls6streamIfLi0EEES2_7ap_uintILi6EEfE6buffer': Complete partitioning on dimension 1. (src/SmoothProfileOnXAxisMeanOptimize.cpp:24:0) INFO: [HLS 214-248] Applying array_partition to '_ZZ32SmoothProfileOnXAxisMeanOptimizeRN3hls6streamIfLi0EEES2_7ap_uintILi6EEfE3win': Complete partitioning on dimension 1. (src/SmoothProfileOnXAxisMeanOptimize.cpp:27:0) INFO: [HLS 200-111] Finished Compiling Optimization and Transform: CPU user time: 0 seconds. CPU system time: 0 seconds. Elapsed time: 6.958 seconds; current allocated memory: 202.637 MB. INFO: [HLS 200-111] Finished Checking Pragmas: CPU user time: 0 seconds. CPU system time: 0 seconds. Elapsed time: 0.002 seconds; current allocated memory: 202.637 MB. INFO: [HLS 200-10] Starting code transformations ... INFO: [HLS 200-111] Finished Standard Transforms: CPU user time: 0 seconds. CPU system time: 0 seconds. Elapsed time: 0.051 seconds; current allocated memory: 208.652 MB. INFO: [HLS 200-10] Checking synthesizability ... WARNING: [SYNCHK 200-23] src/SmoothProfileOnXAxisMeanOptimize.cpp:100: variable-indexed range selection may cause suboptimal QoR. INFO: [SYNCHK 200-10] 0 error(s), 1 warning(s). INFO: [HLS 200-111] Finished Checking Synthesizability: CPU user time: 0 seconds. CPU system time: 0 seconds. Elapsed time: 0.06 seconds; current allocated memory: 210.320 MB. INFO: [XFORM 203-401] Performing if-conversion on hyperblock from (src/SmoothProfileOnXAxisMeanOptimize.cpp:16:9) to (src/SmoothProfileOnXAxisMeanOptimize.cpp:90:9) in function 'SmoothProfileOnXAxisMeanOptimize'... converting 13 basic blocks. INFO: [XFORM 203-401] Performing if-conversion on hyperblock from (src/SmoothProfileOnXAxisMeanOptimize.cpp:94:45) in function 'SmoothProfileOnXAxisMeanOptimize'... converting 7 basic blocks. INFO: [XFORM 203-401] Performing if-conversion on hyperblock from (src/SmoothProfileOnXAxisMeanOptimize.cpp:89:13) to (src/SmoothProfileOnXAxisMeanOptimize.cpp:101:1) in function 'SmoothProfileOnXAxisMeanOptimize'... converting 10 basic blocks. INFO: [XFORM 203-11] Balancing expressions in function 'SmoothProfileOnXAxisMeanOptimize' (src/SmoothProfileOnXAxisMeanOptimize.cpp:10:1)...20 expression(s) balanced. INFO: [HLS 200-111] Finished Loop, function and other optimizations: CPU user time: 0 seconds. CPU system time: 0 seconds. Elapsed time: 0.157 seconds; current allocated memory: 233.824 MB. INFO: [HLS 200-111] Finished Architecture Synthesis: CPU user time: 0 seconds. CPU system time: 0 seconds. Elapsed time: 0.088 seconds; current allocated memory: 233.828 MB. INFO: [HLS 200-10] Starting hardware synthesis ... INFO: [HLS 200-10] Synthesizing 'SmoothProfileOnXAxisMeanOptimize' ... INFO: [HLS 200-10] ---------------------------------------------------------------- INFO: [HLS 200-42] -- Implementing module 'SmoothProfileOnXAxisMeanOptimize' INFO: [HLS 200-10] ---------------------------------------------------------------- INFO: [SCHED 204-11] Starting scheduling ... INFO: [SCHED 204-61] Pipelining function 'SmoothProfileOnXAxisMeanOptimize'. INFO: [HLS 200-1470] Pipelining result : Target II = 1, Final II = 1, Depth = 81, function 'SmoothProfileOnXAxisMeanOptimize' INFO: [SCHED 204-11] Finished scheduling. INFO: [HLS 200-111] Finished Scheduling: CPU user time: 0 seconds. CPU system time: 0 seconds. Elapsed time: 0.319 seconds; current allocated memory: 238.062 MB. INFO: [BIND 205-100] Starting micro-architecture generation ... INFO: [BIND 205-101] Performing variable lifetime analysis. INFO: [BIND 205-101] Exploring resource sharing. INFO: [BIND 205-101] Binding ... INFO: [BIND 205-100] Finished micro-architecture generation. INFO: [HLS 200-111] Finished Binding: CPU user time: 0 seconds. CPU system time: 0 seconds. Elapsed time: 0.118 seconds; current allocated memory: 239.660 MB. INFO: [HLS 200-10] ---------------------------------------------------------------- INFO: [HLS 200-10] -- Generating RTL for module 'SmoothProfileOnXAxisMeanOptimize' INFO: [HLS 200-10] ---------------------------------------------------------------- WARNING: [RTGEN 206-101] Design contains AXI ports. Reset is fixed to synchronous and active low. INFO: [RTGEN 206-500] Setting interface mode on port 'SmoothProfileOnXAxisMeanOptimize/points_in_z' to 'axis' (register, both mode). INFO: [RTGEN 206-500] Setting interface mode on port 'SmoothProfileOnXAxisMeanOptimize/smoothed_z' to 'axis' (register, both mode). INFO: [RTGEN 206-500] Setting interface mode on port 'SmoothProfileOnXAxisMeanOptimize/mean_win_size' to 'ap_none'. INFO: [RTGEN 206-500] Setting interface mode on port 'SmoothProfileOnXAxisMeanOptimize/invalid_z' to 'ap_none'. INFO: [RTGEN 206-500] Setting interface mode on function 'SmoothProfileOnXAxisMeanOptimize' to 'ap_ctrl_none'. WARNING: [RTGEN 206-101] Register 'p_ZZ32SmoothProfileOnXAxisMeanOptimizeRN3hls6streamIfLi0EEES2_7ap_uintILi6EEfE6bu' is power-on initialization. WARNING: [RTGEN 206-101] Register 'p_ZZ32SmoothProfileOnXAxisMeanOptimizeRN3hls6streamIfLi0EEES2_7ap_uintILi6EEfE6bu_1' is power-on initialization. WARNING: [RTGEN 206-101] Register 'p_ZZ32SmoothProfileOnXAxisMeanOptimizeRN3hls6streamIfLi0EEES2_7ap_uintILi6EEfE6bu_2' is power-on initialization. WARNING: [RTGEN 206-101] Register 'p_ZZ32SmoothProfileOnXAxisMeanOptimizeRN3hls6streamIfLi0EEES2_7ap_uintILi6EEfE6bu_3' is power-on initialization. WARNING: [RTGEN 206-101] Register 'p_ZZ32SmoothProfileOnXAxisMeanOptimizeRN3hls6streamIfLi0EEES2_7ap_uintILi6EEfE6bu_4' is power-on initialization. WARNING: [RTGEN 206-101] Register 'p_ZZ32SmoothProfileOnXAxisMeanOptimizeRN3hls6streamIfLi0EEES2_7ap_uintILi6EEfE6bu_5' is power-on initialization. WARNING: [RTGEN 206-101] Register 'p_ZZ32SmoothProfileOnXAxisMeanOptimizeRN3hls6streamIfLi0EEES2_7ap_uintILi6EEfE6bu_6' is power-on initialization. WARNING: [RTGEN 206-101] Register 'p_ZZ32SmoothProfileOnXAxisMeanOptimizeRN3hls6streamIfLi0EEES2_7ap_uintILi6EEfE6bu_7' is power-on initialization. WARNING: [RTGEN 206-101] Register 'p_ZZ32SmoothProfileOnXAxisMeanOptimizeRN3hls6streamIfLi0EEES2_7ap_uintILi6EEfE6bu_8' is power-on initialization. WARNING: [RTGEN 206-101] Register 'p_ZZ32SmoothProfileOnXAxisMeanOptimizeRN3hls6streamIfLi0EEES2_7ap_uintILi6EEfE6bu_9' is power-on initialization. WARNING: [RTGEN 206-101] Register 'p_ZZ32SmoothProfileOnXAxisMeanOptimizeRN3hls6streamIfLi0EEES2_7ap_uintILi6EEfE6bu_10' is power-on initialization. WARNING: [RTGEN 206-101] Register 'p_ZZ32SmoothProfileOnXAxisMeanOptimizeRN3hls6streamIfLi0EEES2_7ap_uintILi6EEfE6bu_11' is power-on initialization. WARNING: [RTGEN 206-101] Register 'p_ZZ32SmoothProfileOnXAxisMeanOptimizeRN3hls6streamIfLi0EEES2_7ap_uintILi6EEfE6bu_12' is power-on initialization. WARNING: [RTGEN 206-101] Register 'p_ZZ32SmoothProfileOnXAxisMeanOptimizeRN3hls6streamIfLi0EEES2_7ap_uintILi6EEfE6bu_13' is power-on initialization. WARNING: [RTGEN 206-101] Register 'p_ZZ32SmoothProfileOnXAxisMeanOptimizeRN3hls6streamIfLi0EEES2_7ap_uintILi6EEfE6bu_14' is power-on initialization. WARNING: [RTGEN 206-101] Register 'p_ZZ32SmoothProfileOnXAxisMeanOptimizeRN3hls6streamIfLi0EEES2_7ap_uintILi6EEfE6bu_15' is power-on initialization. WARNING: [RTGEN 206-101] Register 'p_ZZ32SmoothProfileOnXAxisMeanOptimizeRN3hls6streamIfLi0EEES2_7ap_uintILi6EEfE6bu_16' is power-on initialization. WARNING: [RTGEN 206-101] Register 'p_ZZ32SmoothProfileOnXAxisMeanOptimizeRN3hls6streamIfLi0EEES2_7ap_uintILi6EEfE6bu_17' is power-on initialization. WARNING: [RTGEN 206-101] Register 'p_ZZ32SmoothProfileOnXAxisMeanOptimizeRN3hls6streamIfLi0EEES2_7ap_uintILi6EEfE6bu_18' is power-on initialization. WARNING: [RTGEN 206-101] Register 'p_ZZ32SmoothProfileOnXAxisMeanOptimizeRN3hls6streamIfLi0EEES2_7ap_uintILi6EEfE6bu_19' is power-on initialization. WARNING: [RTGEN 206-101] Register 'p_ZZ32SmoothProfileOnXAxisMeanOptimizeRN3hls6streamIfLi0EEES2_7ap_uintILi6EEfE6bu_20' is power-on initialization. WARNING: [RTGEN 206-101] Register 'p_ZZ32SmoothProfileOnXAxisMeanOptimizeRN3hls6streamIfLi0EEES2_7ap_uintILi6EEfE6bu_21' is power-on initialization. WARNING: [RTGEN 206-101] Register 'SmoothProfileOnXAxisMeanOptimize_stream_stream_ap_uint_6_float_buffer' is power-on initialization. WARNING: [RTGEN 206-101] Register 'SmoothProfileOnXAxisMeanOptimize_stream_stream_ap_uint_6_float_buffer_1' is power-on initialization. WARNING: [RTGEN 206-101] Register 'SmoothProfileOnXAxisMeanOptimize_stream_stream_ap_uint_6_float_buffer_2' is power-on initialization. WARNING: [RTGEN 206-101] Register 'SmoothProfileOnXAxisMeanOptimize_stream_stream_ap_uint_6_float_buffer_3' is power-on initialization. WARNING: [RTGEN 206-101] Register 'SmoothProfileOnXAxisMeanOptimize_stream_stream_ap_uint_6_float_buffer_4' is power-on initialization. WARNING: [RTGEN 206-101] Register 'SmoothProfileOnXAxisMeanOptimize_stream_stream_ap_uint_6_float_buffer_5' is power-on initialization. WARNING: [RTGEN 206-101] Register 'SmoothProfileOnXAxisMeanOptimize_stream_stream_ap_uint_6_float_buffer_6' is power-on initialization. WARNING: [RTGEN 206-101] Register 'SmoothProfileOnXAxisMeanOptimize_stream_stream_ap_uint_6_float_buffer_7' is power-on initialization. WARNING: [RTGEN 206-101] Register 'SmoothProfileOnXAxisMeanOptimize_stream_stream_ap_uint_6_float_buffer_8' is power-on initialization. WARNING: [RTGEN 206-101] Register 'SmoothProfileOnXAxisMeanOptimize_stream_stream_ap_uint_6_float_buffer_9' is power-on initialization. WARNING: [RTGEN 206-101] Register 'p_ZZ32SmoothProfileOnXAxisMeanOptimizeRN3hls6streamIfLi0EEES2_7ap_uintILi6EEfE3wi' is power-on initialization. WARNING: [RTGEN 206-101] Register 'SmoothProfileOnXAxisMeanOptimize_hls_stream_float_0_hls_stream_float_0_ap_uint_6_float_wi_s_19' is power-on initialization. WARNING: [RTGEN 206-101] Register 'SmoothProfileOnXAxisMeanOptimize_hls_stream_float_0_hls_stream_float_0_ap_uint_6_float_wi_s_8' is power-on initialization. WARNING: [RTGEN 206-101] Register 'SmoothProfileOnXAxisMeanOptimize_hls_stream_float_0_hls_stream_float_0_ap_uint_6_float_wi_s_5' is power-on initialization. WARNING: [RTGEN 206-101] Register 'SmoothProfileOnXAxisMeanOptimize_hls_stream_float_0_hls_stream_float_0_ap_uint_6_float_wi_s_4' is power-on initialization. WARNING: [RTGEN 206-101] Register 'SmoothProfileOnXAxisMeanOptimize_hls_stream_float_0_hls_stream_float_0_ap_uint_6_float_wi_s_3' is power-on initialization. WARNING: [RTGEN 206-101] Register 'SmoothProfileOnXAxisMeanOptimize_hls_stream_float_0_hls_stream_float_0_ap_uint_6_float_wi_s_2' is power-on initialization. WARNING: [RTGEN 206-101] Register 'SmoothProfileOnXAxisMeanOptimize_hls_stream_float_0_hls_stream_float_0_ap_uint_6_float_wi_s_1' is power-on initialization. WARNING: [RTGEN 206-101] Register 'SmoothProfileOnXAxisMeanOptimize_hls_stream_float_0_hls_stream_float_0_ap_uint_6_float_wi_s_0' is power-on initialization. WARNING: [RTGEN 206-101] Register 'SmoothProfileOnXAxisMeanOptimize_hls_stream_float_0_hls_stream_float_0_ap_uint_6_float_wi_s' is power-on initialization. WARNING: [RTGEN 206-101] Register 'SmoothProfileOnXAxisMeanOptimize_hls_stream_float_0_hls_stream_float_0_ap_uint_6_float_wi_s_18' is power-on initialization. WARNING: [RTGEN 206-101] Register 'SmoothProfileOnXAxisMeanOptimize_hls_stream_float_0_hls_stream_float_0_ap_uint_6_float_wi_s_17' is power-on initialization. WARNING: [RTGEN 206-101] Register 'SmoothProfileOnXAxisMeanOptimize_hls_stream_float_0_hls_stream_float_0_ap_uint_6_float_wi_s_16' is power-on initialization. WARNING: [RTGEN 206-101] Register 'SmoothProfileOnXAxisMeanOptimize_hls_stream_float_0_hls_stream_float_0_ap_uint_6_float_wi_s_15' is power-on initialization. WARNING: [RTGEN 206-101] Register 'SmoothProfileOnXAxisMeanOptimize_hls_stream_float_0_hls_stream_float_0_ap_uint_6_float_wi_s_14' is power-on initialization. WARNING: [RTGEN 206-101] Register 'SmoothProfileOnXAxisMeanOptimize_hls_stream_float_0_hls_stream_float_0_ap_uint_6_float_wi_s_13' is power-on initialization. WARNING: [RTGEN 206-101] Register 'SmoothProfileOnXAxisMeanOptimize_hls_stream_float_0_hls_stream_float_0_ap_uint_6_float_wi_s_12' is power-on initialization. WARNING: [RTGEN 206-101] Register 'SmoothProfileOnXAxisMeanOptimize_hls_stream_float_0_hls_stream_float_0_ap_uint_6_float_wi_s_11' is power-on initialization. WARNING: [RTGEN 206-101] Register 'SmoothProfileOnXAxisMeanOptimize_hls_stream_float_0_hls_stream_float_0_ap_uint_6_float_wi_s_10' is power-on initialization. WARNING: [RTGEN 206-101] Register 'SmoothProfileOnXAxisMeanOptimize_hls_stream_float_0_hls_stream_float_0_ap_uint_6_float_wi_s_9' is power-on initialization. WARNING: [RTGEN 206-101] Register 'SmoothProfileOnXAxisMeanOptimize_hls_stream_float_0_hls_stream_float_0_ap_uint_6_float_wi_s_7' is power-on initialization. WARNING: [RTGEN 206-101] Register 'SmoothProfileOnXAxisMeanOptimize_hls_stream_float_0_hls_stream_float_0_ap_uint_6_float_wi_s_6' is power-on initialization. WARNING: [RTGEN 206-101] Register 'SmoothProfileOnXAxisMeanOptimize_stream_stream_ap_uint_6_float_win' is power-on initialization. WARNING: [RTGEN 206-101] Register 'SmoothProfileOnXAxisMeanOptimize_stream_stream_ap_uint_6_float_win_1' is power-on initialization. WARNING: [RTGEN 206-101] Register 'SmoothProfileOnXAxisMeanOptimize_stream_stream_ap_uint_6_float_win_2' is power-on initialization. WARNING: [RTGEN 206-101] Register 'SmoothProfileOnXAxisMeanOptimize_stream_stream_ap_uint_6_float_win_3' is power-on initialization. WARNING: [RTGEN 206-101] Register 'SmoothProfileOnXAxisMeanOptimize_stream_stream_ap_uint_6_float_win_4' is power-on initialization. WARNING: [RTGEN 206-101] Register 'SmoothProfileOnXAxisMeanOptimize_stream_stream_ap_uint_6_float_win_5' is power-on initialization. WARNING: [RTGEN 206-101] Register 'SmoothProfileOnXAxisMeanOptimize_stream_stream_ap_uint_6_float_win_6' is power-on initialization. WARNING: [RTGEN 206-101] Register 'SmoothProfileOnXAxisMeanOptimize_stream_stream_ap_uint_6_float_win_7' is power-on initialization. WARNING: [RTGEN 206-101] Register 'SmoothProfileOnXAxisMeanOptimize_stream_stream_ap_uint_6_float_win_8' is power-on initialization. WARNING: [RTGEN 206-101] Register 'SmoothProfileOnXAxisMeanOptimize_stream_stream_ap_uint_6_float_win_9' is power-on initialization. INFO: [HLS 200-1030] Apply Unified Pipeline Control on module 'SmoothProfileOnXAxisMeanOptimize' pipeline 'SmoothProfileOnXAxisMeanOptimize' pipeline type 'function pipeline' INFO: [HLS 200-1552] Enabling free running pipeline (frp) architecture on pipeline 'SmoothProfileOnXAxisMeanOptimize' in module 'SmoothProfileOnXAxisMeanOptimize'. Estimated max control fanout for pipeline is 10267. WARNING: [RTGEN 206-101] Port 'SmoothProfileOnXAxisMeanOptimize/mean_win_size' has no fanin or fanout and is left dangling. Please use C simulation to confirm this function argument can be read from or written to. INFO: [RTGEN 206-100] Generating core module 'ddiv_64ns_64ns_64_59_no_dsp_1': 1 instance(s).
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背景：循环结构是c语言中经常出现的内容。HLS会对数组作出具体的优化。 目的：目的，搞懂HLS对数组的操作。 UG902 v2016.4 P326：HLS用户指南中数组的内容 CH.3 HLS coding styles：Arrays 目录 1. 数组 1.1 c仿真中的数组 1.2 数组的实现 1.3 可能出现的问题 2. 数组的接入与性能 3. FIFO接入 4. 数组的...
vivado HLS硬件化指令（一）HLS针对循环的硬件优化
祥瑞的技术博客
08-07 7459
背景：循环结构是c语言中经常出现的结构。HLS会对循环结构作出具体的优化。 目的：目的，搞懂HLS对循环的操作。 UG902 v2016.4 P318：HLS用户指南中Loops内容 目录 1.对循环的操作 2.循环上限变动 2.1 无法确定latency与performance 2.2 产生报告方法：运用tripcount指令 2.3 无法运行的优化 2.4 优化方案，定上...
hls心得（1）
kebu12345678的博客
03-13 3930
网上关于hls的东西太少 了。写一些。  Verilog 设计考虑很多的是 存储器的使用，资源的多少。 hls 则主要考虑 算法能否 pipeline， dataflow， unroll，因此，多是用空间换时间。  还有，算法的并行化，在Verilog里多是用 模块实例化实现，以及always语句。 在hls中，没有always，所以用 函数来生成模块，以实现
#pragma unroll的用法
Zender
08-01 9565
在默认情形下，编译器对已知次数的小循环进行展开，#pragma unroll 可以用来控制任意一个给定的循环。但 #pragma unroll必须放在被控制的循环的前面，后面可以带展开次数选项。后跟参数1则编译器不会展开循环。如果没有参数，并且循环次数是一常数时编译器会将循环完全展开，如果不是常数就根本不会展开。
#pragma UNROLL 4
Jackery's Special Column
04-13 2865
在图像处理程序中，你会看到类似于#pragma unroll 4这样的语句(注：在DX中，也许你会见到[unroll(3)] for(int i = 0;i < Total; i++)类似情况)，现具体解释如下：  语法： #pragma UNROLL(n) #pragma UNROLL告诉编译器一个循环中应该展开n次(其实我觉得是告诉编译器循环展开n次是安全的)，有助于对那些不容易展开的循环有更大概率的进行软件流水。 其实很多很多时候编译器会自动判断各种信息，但是这增加了冗余开销，反倒不如直接
ZED Board从入门到精通系列（八）——Vivado HLS实现矩阵相乘
卜居
01-29 2万+
终于到了HLS部分。HLS是High Level Synthesis的缩写，可以将高级程序设计语言C，C++，SystemC综合为RTL代码的工具。   生产力的发展推动了设计模式。在电子技术初级阶段，人们关注的是RLC电路，通过建立微分方程求解电路响应。门级电路是对RLC的初步封装，人们进而采用布尔代数、卡诺图进行电路设计与分析。之后随着集成电路进一步发展，门电路可以集成为寄存器、触发器、R
PlayKit JS HLS适配器：实现HLS.JS在PlayKit播放器的集成
资源摘要信息:"playkit-js-hls:适用于PlayKit JS Player的HLS.JS适配器" 知识点详细说明： 1. PlayKit JS Player和HLS.JS适配器概述 PlayKit JS Player是一个开源的视频播放器，由Kaltura项目提供支持。它为开发者...
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