[BB PR #31] Add SIMD optimized code for the LoongArch platform.

.migration-bb-pr-31.md

@@ -0,0 +1,87 @@
+# Migrated from Bitbucket PR #31
+
+**Title:** Add SIMD optimized code for the LoongArch platform.
+**Author:** Hao Chen
+**State:** MERGED
+**Created:** 2024-12-17
+**Original PR:** https://bitbucket.org/multicoreware/x265_git/pull-requests/31
+**Original Diff:** https://api.bitbucket.org/2.0/repositories/multicoreware/x265_git/diff/multicoreware/x265_git:1b48507eb2a6%0D1b48507eb2a6?from_pullrequest_id=31&topic=true
+
+## Description
+
+* LoongArch64: Add loongarch support
+
+    Lsx and Lasx optimizations are automatically enabled by detecting the characteristics of the CPU.
+
+
+
+    Change-Id: I22de05163adb075856722d37f15ac8469ba5c6b0
+
+
+* LoongArch64: Optimize functions in loopfilter module
+
+    Optimize functions in loopfilter module with lsx and lasx.
+
+
+* LoongArch64: Add assembly check tool
+
+    1. Check if Registers are Saved and Restored
+    2. Check if 32-bit Integer Parameters are Properly Converted to 64-bit Integers
+
+* LoongArch64: Optimize functions in ipfilter module
+
+    Optimize functions in ipfilter module with lsx and lasx.
+
+
+* LoongArch64: Optimize functions in dct.S file - Patch 1
+
+    The optimized functions are as follows: dct32\_lsx/dct32\_lasx dct16\_lsx/dct16\_lasx idct16\_lsx/idct16\_lasx idct32\_lsx/idct32\_lasx dct8/4\_lsx idct8/4\_lsx dst4/idst4\_lsx scanPosLast\_lsx costCoeffNxN\_lsx
+
+
+* LoongArch64: Optimize functions in dct.S file - Patch 2
+
+    The optimized functions are as follows: quant\_lsx/quant\_lasx dequant\_normal\_lsx/dequant\_normal\_lasx dequant\_scaling\_lsx/dequant\_scaling\_lasx nquant\_lsx/nquant\_lasx
+
+
+* LoongArch64: Optimize functions in dct.S file - Patch 3
+
+    The optimized functions are as follows: count\_nonzero\_32\_lsx/count\_nonzero\_32\_lasx count\_nonzero\_16\_lsx/count\_nonzero\_16\_lasx count\_nonzero\_8\_lsx/count\_nonzero\_8\_lasx count\_nonzero\_4\_lsx/count\_nonzero\_4\_lasx costC1C2Flag\_lsx costCoeffRemain\_lsx findPosFirstLast\_lsx/findPosFirstLast\_lasx denoiseDct\_lsx/denoiseDct\_lasx
+
+
+* LoongArch64: Optimize functions in mc-a.S file
+
+    Optimize functions in mc-a.S file with lsx and lasx.
+
+
+* LoongArch64: Optimize functions in intrapred8.S file - Patch 1
+
+    The optimized functions are as follows: intra\_pred\_ang4\__lsx intra\_pred\_ang8lsx/intra\_pred\_ang8lasx intra\_pred\_ang16lsx/intra\_pred\_ang16lasx intra\_pred\_ang32_\_lsx intra\_pred\_dc4\_lsx intra\_pred\_dc8\_lsx intra\_pred\_dc16\_lsx intra\_pred\_dc32\_lsx
+
+
+* LoongArch64: Optimize functions in intrapred8.S file - Patch 2
+
+    The optimized functions are as follows: intra\_filter\_4x4\_lsx/intra\_filter\_4x4\_lasx intra\_filter\_8x8\_lsx/intra\_filter\_8x8\_lasx intra\_filter\_16x16\_lsx/intra\_filter\_16x16\_lasx intra\_filter\_32x32\_lsx/intra\_filter\_32x32\_lasx intra\_pred\_planar\_4x4\_lsx intra\_pred\_planar\_8x8\_lsx intra\_pred\_planar\_16x16\_lsx intra\_pred\_planar\_32x32\_lsx
+
+
+* LoongArch64: Optimize functions in pixel processing module
+
+    These functions optimized with lsx or lasx are contained in the pixel.S, sad.S and ssd.S files.
+
+
+* LoongArch64: Optimize functions in mc-a2.S file
+
+    Optimize functions in mc-a2.S file with lsx and lasx.
+
+
+* LoongArch64: Optimize functions in blockcopy8.S file - Patch 1
+
+    Optimize functions related to block copying, block filling and other opreations with lsx and lasx.
+
+
+* LoongArch64: Optimize functions in blockcopy8.S file - Patch 2
+
+    The optimized functions are as follows: x265\_cpy2Dto1D\_shl_\_lsx/\_lasx x265\_cpy2Dto1D\_shr_\_lsx/\_lasx x265\_cpy1Dto2D\_shl_\_lsx/\_lasx x265\_cpy1Dto2D\_shr_\_lsx/\_lasx
+
+
+
+‌