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configure: add --enable-aligned

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forces aligned memory reads (via memcpy) in the VP8 bit reader, useful
for platforms that don't support unaligned loads.

Change-Id: Ifa44a9a1677fbdc6a929520f9340b7e3fcbd6692
This commit is contained in:
James Zern
2014-07-03 23:06:06 -07:00
parent 380cca4f2c
commit dc0f479d6a
2 changed files with 25 additions and 1 deletions
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13
src/utils/bit_reader_inl.h
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@ -16,6 +16,14 @@
#ifndef WEBP_UTILS_BIT_READER_INL_H_
#define WEBP_UTILS_BIT_READER_INL_H_
#ifdef HAVE_CONFIG_H
#include "../webp/config.h"
#endif
#ifdef WEBP_FORCE_ALIGNED
#include <string.h> // memcpy
#endif
#include "./bit_reader.h"
#include "./endian_inl.h"
@ -52,7 +60,10 @@ static WEBP_INLINE void VP8LoadNewBytes(VP8BitReader* const br) {
if (br->buf_ + sizeof(lbit_t) <= br->buf_end_) {
// convert memory type to register type (with some zero'ing!)
bit_t bits;
#if defined(__mips__) // MIPS
#if defined(WEBP_FORCE_ALIGNED)
lbit_t in_bits;
memcpy(&in_bits, br->buf_, sizeof(in_bits));
#elif defined(__mips__) // MIPS
// This is needed because of un-aligned read.
lbit_t in_bits;
lbit_t* p_buf_ = (lbit_t*)br->buf_;