coffee/libyuv
1
0
Fork 0
mirror of https://chromium.googlesource.com/libyuv/libyuv synced 2026-01-01 03:12:16 +08:00
Code Issues Packages Projects Releases Wiki Activity

use attribute to alias for punning float to int

Browse Source 
Bug: libyuv:791
Test: g++ -Iinclude -I../libvpx/third_party/libwebm -I../libvpx/vp8 -I../libvpx/vp8 -I../libvpx/vp9 -I../libvpx/vp9 -Iinclude -m64 -DNDEBUG -O3 -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=0 -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -Wall -Wdisabled-optimization -Wfloat-conversion -Wpointer-arith -Wtype-limits -Wcast-qual -Wvla -Wuninitialized -Wunused -Wextra -I. -I"../libvpx" -D__STDC_CONSTANT_MACROS -D__STDC_LIMIT_MACROS -Wno-unused-parameter -c -o third_party/libyuv/source/row_common.cc.o source/row_common.cc
Change-Id: Ia006cb9212b671ae668cab5ec0b29759024a2c8a
Reviewed-on: https://chromium-review.googlesource.com/1012462
Reviewed-by: Johann Koenig <johannkoenig@google.com>
Commit-Queue: Frank Barchard <fbarchard@chromium.org>
This commit is contained in:
Frank Barchard 2018-04-13 11:19:28 -07:00 committed by Commit Bot
parent 2edf6745e0
commit 7e5e12757b
3 changed files with 10 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
README.chromium
View File

@ -1,6 +1,6 @@
Name: libyuv
URL: http://code.google.com/p/libyuv/
Version: 1708
Version: 1709
License: BSD
License File: LICENSE

2
include/libyuv/version.h
View File

@ -11,6 +11,6 @@
#ifndef INCLUDE_LIBYUV_VERSION_H_
#define INCLUDE_LIBYUV_VERSION_H_
#define LIBYUV_VERSION 1708
#define LIBYUV_VERSION 1709
#endif // INCLUDE_LIBYUV_VERSION_H_

9
source/row_common.cc
View File

@ -2762,6 +2762,13 @@ void ARGBPolynomialRow_C(const uint8_t* src_argb,
// simply extract the low bits of the exponent and the high
// bits of the mantissa from our float and we're done.
// Work around GCC 7 punning warning -Wstrict-aliasing
#if defined(__GNUC__)
typedef uint32_t __attribute__((__may_alias__)) uint32_alias_t;
#else
typedef uint32_t uint32_alias_t;
#endif
void HalfFloatRow_C(const uint16_t* src,
uint16_t* dst,
float scale,
@ -2770,7 +2777,7 @@ void HalfFloatRow_C(const uint16_t* src,
float mult = 1.9259299444e-34f * scale;
for (i = 0; i < width; ++i) {
float value = src[i] * mult;
dst[i] = (uint16_t)((*(uint32_t*)&value) >> 13);
dst[i] = (uint16_t)((*(const uint32_alias_t*)&value) >> 13);
}
}