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wiiu: Add fastpath for already aligned buffers

This commit is contained in:
Ash Logan 2021-07-18 22:31:43 +10:00
parent a3be19214e
commit e43f07b85b
2 changed files with 95 additions and 65 deletions
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9
libretro-common/file/nbio/nbio_stdio.c
View File

@ -22,6 +22,9 @@
#include <stdio.h>
#include <stdlib.h>
#if defined(WIIU)
#include <malloc.h>
#endif
#include <file/nbio.h>
#include <encodings/utf.h>
@ -130,8 +133,14 @@ static void *nbio_stdio_open(const char * filename, unsigned mode)
handle->mode = mode;
#if defined(WIIU)
/* hit the aligned-buffer fast path on Wii U */
if (len)
buf = memalign(0x40, (size_t)len);
#else
if (len)
buf = malloc((size_t)len);
#endif
if (len && !buf)
goto error;

35
wiiu/fs/sd_fat_devoptab.c
View File

@ -279,6 +279,18 @@ static ssize_t sd_fat_write_r (struct _reent *r, void* fd, const char *ptr, size
OSLockMutex(file->dev->pMutex);
size_t done = 0;
/* fast path: buffer is already correctly aligned */
if (!((uintptr_t)ptr & (FS_ALIGNMENT-1))) {
int result = FSWriteFile(file->dev->pClient, file->dev->pCmd, (uint8_t*)ptr, 1, len, file->fd, 0, -1);
if(result < 0) {
r->_errno = result;
} else {
done = result;
file->pos += result;
}
} else {
size_t len_aligned = FS_ALIGN(len);
if(len_aligned > 0x4000)
len_aligned = 0x4000;
@ -290,17 +302,12 @@ static ssize_t sd_fat_write_r (struct _reent *r, void* fd, const char *ptr, size
return 0;
}
size_t done = 0;
while(done < len)
{
size_t write_size = (len_aligned < (len - done)) ? len_aligned : (len - done);
memcpy(tmpBuf, ptr + done, write_size);
int result = FSWriteFile(file->dev->pClient, file->dev->pCmd, tmpBuf, 0x01, write_size, file->fd, 0, -1);
#if 0
FSFlushFile(file->dev->pClient, file->dev->pCmd, file->fd, -1);
#endif
if(result < 0)
{
r->_errno = result;
@ -320,6 +327,8 @@ static ssize_t sd_fat_write_r (struct _reent *r, void* fd, const char *ptr, size
}
free(tmpBuf);
}
OSUnlockMutex(file->dev->pMutex);
return done;
}
@ -340,6 +349,18 @@ static ssize_t sd_fat_read_r (struct _reent *r, void* fd, char *ptr, size_t len)
OSLockMutex(file->dev->pMutex);
size_t done = 0;
/* fast path: buffer is already correctly aligned */
if (!((uintptr_t)ptr & (FS_ALIGNMENT-1))) {
int result = FSReadFile(file->dev->pClient, file->dev->pCmd, (uint8_t*)ptr, 1, len, file->fd, 0, -1);
if(result < 0) {
r->_errno = result;
} else {
done = result;
file->pos += result;
}
} else {
size_t len_aligned = FS_ALIGN(len);
if(len_aligned > 0x4000)
len_aligned = 0x4000;
@ -351,8 +372,6 @@ static ssize_t sd_fat_read_r (struct _reent *r, void* fd, char *ptr, size_t len)
return 0;
}
size_t done = 0;
while(done < len)
{
size_t read_size = (len_aligned < (len - done)) ? len_aligned : (len - done);
@ -378,6 +397,8 @@ static ssize_t sd_fat_read_r (struct _reent *r, void* fd, char *ptr, size_t len)
}
free(tmpBuf);
}
OSUnlockMutex(file->dev->pMutex);
return done;
}