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Add rounding to FixedDiv

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BUG=250
TEST=unittest more exact
R=dingkai@google.com, ryanpetrie@google.com

Review URL: https://webrtc-codereview.appspot.com/1681005

git-svn-id: http://libyuv.googlecode.com/svn/trunk@735 16f28f9a-4ce2-e073-06de-1de4eb20be90
This commit is contained in:
fbarchard@google.com 2013-06-18 20:37:14 +00:00
parent 567a00f705
commit e5d3e10ee8
6 changed files with 8 additions and 5 deletions
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2
README.chromium
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@ -1,6 +1,6 @@
Name: libyuv
URL: http://code.google.com/p/libyuv/
Version: 734
Version: 735
License: BSD
License File: LICENSE

2
include/libyuv/version.h
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@ -11,6 +11,6 @@
#ifndef INCLUDE_LIBYUV_VERSION_H_ // NOLINT
#define INCLUDE_LIBYUV_VERSION_H_
#define LIBYUV_VERSION 734
#define LIBYUV_VERSION 735
#endif // INCLUDE_LIBYUV_VERSION_H_ NOLINT

3
source/row_common.cc
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@ -757,7 +757,8 @@ extern const uint32 kRecipTable[4097] = {
// Divide num by div and return as 16.16 fixed point result.
int FixedDiv_C(int num, int div) {
if (static_cast<unsigned int>(div) <= 4097u) {
return static_cast<int>((static_cast<int64>(num) * kRecipTable[div]) >> 16);
return static_cast<int>((static_cast<int64>(num) * kRecipTable[div] +
0x8000) >> 16);
}
return static_cast<int>((static_cast<int64>(num) << 16) / div);
}

1
source/row_posix.cc
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@ -5423,6 +5423,7 @@ int FixedDiv(int num, int div) {
"mull (%2,%%ecx,4) \n"
#endif
"shrd $0x10,%%edx,%%eax \n"
"adc $0,%%eax \n"
"9: \n"
"mov %0, %%eax \n"

1
source/row_win.cc
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@ -6616,6 +6616,7 @@ int FixedDiv(int num, int div) {
ja largediv
mul dword ptr kRecipTable[ecx * 4]
shrd eax, edx, 16
adc eax, 0
ret
largediv:

4
unit_test/math_test.cc
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@ -42,10 +42,10 @@ TEST_F(libyuvTest, TestFixedDiv) {
EXPECT_EQ(0x20000, libyuv::FixedDiv(-40000, -20000));
EXPECT_EQ(-0x20000, libyuv::FixedDiv(40000, -20000));
EXPECT_EQ(-0x20000, libyuv::FixedDiv(-40000, 20000));
EXPECT_NEAR(0x10000, libyuv::FixedDiv(4095, 4095), 1);
EXPECT_EQ(0x10000, libyuv::FixedDiv(4095, 4095));
EXPECT_EQ(0x10000, libyuv::FixedDiv(4096, 4096));
EXPECT_EQ(0x10000, libyuv::FixedDiv(4097, 4097));
EXPECT_NEAR(123 * 65536, libyuv::FixedDiv(123, 1), 1);
EXPECT_EQ(123 * 65536, libyuv::FixedDiv(123, 1));
srandom(time(NULL));
MemRandomize(reinterpret_cast<uint8*>(&num[0]), sizeof(num));