# 2017q1 Homework5(matrix)
contributed by <`rayleigh0407`>

## 開發環境

Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                8
On-line CPU(s) list:   0-7
Thread(s) per core:    2
Core(s) per socket:    4
Socket(s):             1
NUMA node(s):          1
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 94
Model name:            Intel(R) Core(TM) i7-6700K CPU @ 4.00GHz
Stepping:              3
CPU MHz:               800.000
CPU max MHz:           4200.0000
CPU min MHz:           800.0000
BogoMIPS:              8016.72
Virtualization:        VT-x
L1d cache:             32K
L1i cache:             32K
L2 cache:              256K
L3 cache:              8192K
NUMA node0 CPU(s):     0-7

## 事前準備

1. 閱讀 [Matrix Multiplication using SIMD](https://hackmd.io/s/Hk-llHEyx)
- 看到 _mm_mullo_epi32 的說明覺得很疑惑 , 查了一下才發現真正的 Operation 為下

        FOR j := 0 to 3
	        i := j*32
	        tmp[63:0] := a[i+31:i] * b[i+31:i]
	        dst[i+31:i] := tmp[31:0]
        ENDFOR

-

### 參考資料
[Intel Intrinsics Guide](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#techs=SSE,SSE4_1,SSE4_2&expand=3726,3726&text=_mm_mullo_epi32)
[# and ## in macros](http://stackoverflow.com/questions/4364971/and-in-macros)
[The C Preprocessor: Concatenation - GCC](https://gcc.gnu.org/onlinedocs/cpp/Concatenation.html)