From 750cab83a3265c101cd38109c249679a6eacd381 Mon Sep 17 00:00:00 2001
From: Geoffrey McRae <geoff@hostfission.com>
Date: Sun, 19 Nov 2023 00:18:48 +1100
Subject: [PATCH] Revert "[common] add AVX/AVX2 memory copy implementations"

This reverts commit e61678ef1b898b8d443e6a4cb00fe912f52d4647.
GCC only supports multi-versioning in C++
---
 common/include/common/rects.h | 14 +++++-
 common/src/framebuffer.c      | 84 +----------------------------------
 common/src/rects.c            | 39 ----------------
 3 files changed, 13 insertions(+), 124 deletions(-)

diff --git a/common/include/common/rects.h b/common/include/common/rects.h
index 738530dd..b238c711 100644
--- a/common/include/common/rects.h
+++ b/common/include/common/rects.h
@@ -27,8 +27,18 @@
 #include "common/framebuffer.h"
 #include "common/types.h"
 
-void rectCopyUnaligned(uint8_t * dst, const uint8_t * src,
-  int ystart, int yend, int dx, int dstPitch, int srcPitch, int width);
+inline static void rectCopyUnaligned(uint8_t * dst, const uint8_t * src,
+    int ystart, int yend, int dx, int dstPitch, int srcPitch, int width)
+{
+  src += ystart * srcPitch + dx;
+  dst += ystart * dstPitch + dx;
+  for (int i = ystart; i < yend; ++i)
+  {
+    memcpy(dst, src, width);
+    src += srcPitch;
+    dst += dstPitch;
+ }
+}
 
 void rectsBufferToFramebuffer(FrameDamageRect * rects, int count, int bpp,
   FrameBuffer * frame, int dstPitch, int height,
diff --git a/common/src/framebuffer.c b/common/src/framebuffer.c
index 8f6f379a..c743d5cf 100644
--- a/common/src/framebuffer.c
+++ b/common/src/framebuffer.c
@@ -29,7 +29,6 @@
 #include <string.h>
 #include <emmintrin.h>
 #include <smmintrin.h>
-#include <immintrin.h>
 #include <unistd.h>
 
 bool framebuffer_wait(const FrameBuffer * frame, size_t size)
@@ -166,9 +165,7 @@ void framebuffer_prepare(FrameBuffer * frame)
   atomic_store_explicit(&frame->wp, 0, memory_order_release);
 }
 
-__attribute__((target("default")))
-bool framebuffer_write(FrameBuffer * frame, const void * restrict src,
-    size_t size)
+bool framebuffer_write(FrameBuffer * frame, const void * restrict src, size_t size)
 {
 #ifdef FB_PROFILE
   static RunningAvg ra = NULL;
@@ -225,85 +222,6 @@ bool framebuffer_write(FrameBuffer * frame, const void * restrict src,
   return true;
 }
 
-#if 1
-__attribute__((target("avx2")))
-bool framebuffer_write(FrameBuffer *frame, const void *restrict src, size_t size)
-{
-#ifdef FB_PROFILE
-    static RunningAvg ra = NULL;
-    static int raCount = 0;
-    const uint64_t ts = microtime();
-    if (!ra)
-        ra = runningavg_new(100);
-#endif
-
-  __m256i *restrict s = (__m256i *)src;
-  __m256i *restrict d = (__m256i *)frame->data;
-  size_t wp = 0;
-
-  _mm_mfence();
-
-  /* copy in chunks */
-  while (size > 127)
-  {
-    __m256i *_d = (__m256i *)d;
-    __m256i *_s = (__m256i *)s;
-    __m256i v1 = _mm256_stream_load_si256(_s + 0);
-    __m256i v2 = _mm256_stream_load_si256(_s + 1);
-    __m256i v3 = _mm256_stream_load_si256(_s + 2);
-    __m256i v4 = _mm256_stream_load_si256(_s + 3);
-
-    _mm256_stream_si256(_d + 0, v1);
-    _mm256_stream_si256(_d + 1, v2);
-    _mm256_stream_si256(_d + 2, v3);
-    _mm256_stream_si256(_d + 3, v4);
-
-    s += 4;
-    d += 4;
-    size -= 128;
-    wp += 128;
-
-    if (wp % FB_CHUNK_SIZE == 0)
-      atomic_store_explicit(&frame->wp, wp, memory_order_release);
-  }
-
-  if (size > 63)
-  {
-    __m256i *_d = (__m256i *)d;
-    __m256i *_s = (__m256i *)s;
-    __m256i v1 = _mm256_stream_load_si256(_s);
-    __m256i v2 = _mm256_stream_load_si256(_s + 1);
-
-    _mm256_stream_si256(_d, v1);
-    _mm256_stream_si256(_d + 1, v2);
-
-    s += 2;
-    d += 2;
-    size -= 64;
-    wp += 64;
-
-    if (wp % FB_CHUNK_SIZE == 0)
-      atomic_store_explicit(&frame->wp, wp, memory_order_release);
-  }
-
-  if (size)
-  {
-    memcpy(frame->data + wp, s, size);
-    wp += size;
-  }
-
-  atomic_store_explicit(&frame->wp, wp, memory_order_release);
-
-#ifdef FB_PROFILE
-  runningavg_push(ra, microtime() - ts);
-  if (++raCount % 100 == 0)
-    DEBUG_INFO("Average Copy Time: %.2fμs", runningavg_calc(ra));
-#endif
-
-  return true;
-}
-#endif
-
 const uint8_t * framebuffer_get_buffer(const FrameBuffer * frame)
 {
   return frame->data;
diff --git a/common/src/rects.c b/common/src/rects.c
index 59be63f8..eaa645ae 100644
--- a/common/src/rects.c
+++ b/common/src/rects.c
@@ -22,45 +22,6 @@
 #include "common/util.h"
 
 #include <stdlib.h>
-#include <immintrin.h>
-
-__attribute__((target("default")))
-void rectCopyUnaligned(uint8_t * dst, const uint8_t * src,
-    int ystart, int yend, int dx, int dstPitch, int srcPitch, int width)
-{
-  src += ystart * srcPitch + dx;
-  dst += ystart * dstPitch + dx;
-  for (int i = ystart; i < yend; ++i)
-  {
-    memcpy(dst, src, width);
-    src += srcPitch;
-    dst += dstPitch;
-  }
-}
-
-__attribute__((target("avx")))
-void rectCopyUnaligned(uint8_t * dst, const uint8_t * src,
-    int ystart, int yend, int dx, int dstPitch, int srcPitch, int width)
-{
-  src += ystart * srcPitch + dx;
-  dst += ystart * dstPitch + dx;
-  for (int i = ystart; i < yend; ++i)
-  {
-    int col;
-    for(col = 0; col <= width - 32; col += 32)
-    {
-      _mm_prefetch(src + col + 256, _MM_HINT_T0);
-      __m256i srcData = _mm256_loadu_si256((__m256i*)(src + col));
-      _mm256_storeu_si256((__m256i*)(dst + col), srcData);
-    }
-
-    for(; col < width; ++col)
-      dst[col] = src[col];
-
-    src += srcPitch;
-    dst += dstPitch;
- }
-}
 
 struct Corner
 {