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AVX512_changes
Feb 19, 2020
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deeptiag1 Feb 19, 2020
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AVX512_changes_P3
deeptiag1 Feb 19, 2020
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AVX512_changes_P4
deeptiag1 Feb 20, 2020
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deeptiag1 Feb 21, 2020
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deeptiag1 Mar 12, 2020
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avx512-changes_v3
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avx512-changes_v3
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1 change: 1 addition & 0 deletions README.md
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Expand Up @@ -69,6 +69,7 @@ In order to run the highest resolution supported by the encoder, at least 64GB o
- Download the yasm exe from the following [link](http://www.tortall.net/projects/yasm/releases/yasm-1.3.0-win64.exe)
- Rename yasm-1.3.0-win64.exe to yasm.exe
- Copy yasm.exe into a location that is in the PATH environment variable
- Vnni requires gcc version greater then 9.2.
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  1. greater than
  2. On my server it seems to be working with version: gcc version 9.2.1

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Fixed


- __Build Instructions__
- Build the project by following the steps below in a windows command prompt:
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6 changes: 5 additions & 1 deletion Source/Lib/ASM_AVX2/CMakeLists.txt
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Expand Up @@ -17,7 +17,10 @@ link_directories(${PROJECT_SOURCE_DIR}/Source/Lib/ASM_SSSE3/)

set(flags_to_test
-mavx2
-static-intel
-mavx512bw
-mavx512vnni
-mavx512vl
-static-intel
/Qwd10148
/Qwd10010
/Qwd10157)
Expand Down Expand Up @@ -79,6 +82,7 @@ set(ASM_AVX2_SOURCE
EbNoiseExtractAVX2.c
EbPackUnPack_Intrinsic_AVX2.c
EbPictureOperators_Intrinsic_AVX2.c
EbTransforms_Intrinsic_VNNI.c
EbTransforms_Intrinsic_AVX2.c)

if(COMPILE_AS_CPP)
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25 changes: 14 additions & 11 deletions Source/Lib/ASM_AVX2/EbComputeSAD_SadLoopKernel_AVX512.c
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Expand Up @@ -209,6 +209,8 @@ void SadLoopKernel_AVX512_HmeL0_INTRIN(

case 16:
{
__m512i x = _mm512_setr_epi64(0x0000000000000000, 0x0001000100010001, 0x0004000400040004, 0x0005000500050005, 0x0001000100010001, 0x0002000200020002, 0x0005000500050005, 0x0006000600060006);
__m512i x1 = _mm512_setr_epi64(0x0001000100010001, 0x0002000200020002, 0x0005000500050005, 0x0006000600060006, 0x0002000200020002, 0x0003000300030003, 0x0006000600060006, 0x0007000700070007);
if (height <= 16 && searchAreaWidth <= 128)
{
for (i = 0; i<searchAreaHeight; i++)
Expand Down Expand Up @@ -243,17 +245,18 @@ void SadLoopKernel_AVX512_HmeL0_INTRIN(

for (j = 0, pRef = pRef1; j < n; j++, pRef += 16)
{
__m256i ss0 = _mm256_inserti128_si256(_mm256_castsi128_si256(_mm_loadu_si128((__m128i*)(pRef ))), _mm_loadu_si128((__m128i*)(pRef + refStride )), 0x1);
__m256i ss1 = _mm256_inserti128_si256(_mm256_castsi128_si256(_mm_loadu_si128((__m128i*)(pRef + 8 ))), _mm_loadu_si128((__m128i*)(pRef + refStride + 8 )), 0x1);
ss2 = _mm256_inserti128_si256(_mm256_castsi128_si256(_mm_loadu_si128((__m128i*)(pRef + 16))), _mm_loadu_si128((__m128i*)(pRef + refStride + 16)), 0x1);

__m512i ss1ftemp = _mm512_inserti64x4(_mm512_castsi256_si512(ss0), ss1, 0x1);
__m512i ss2ftemp = _mm512_inserti64x4(_mm512_castsi256_si512(ss1), ss2, 0x1);

ss3sum1_aaray[j] = _mm512_adds_epu16(ss3sum1_aaray[j], _mm512_dbsad_epu8(ref1ftemp, ss1ftemp, 0x94));
ss3sum1_aaray[j] = _mm512_adds_epu16(ss3sum1_aaray[j], _mm512_dbsad_epu8(ref2ftemp, ss1ftemp, 0xE9));
ss7sum1_aaray[j] = _mm512_adds_epu16(ss7sum1_aaray[j], _mm512_dbsad_epu8(ref3ftemp, ss2ftemp, 0x94));
ss7sum1_aaray[j] = _mm512_adds_epu16(ss7sum1_aaray[j], _mm512_dbsad_epu8(ref4ftemp, ss2ftemp, 0xE9));
__m512i ss0 = _mm512_inserti64x4(_mm512_castsi256_si512(_mm256_loadu_si256((__m256i*)(pRef))), _mm256_loadu_si256((__m256i*)(pRef + refStride )), 0x1);
__m512i ss1ftemp = _mm512_permutexvar_epi64(x, ss0);
__m512i ss2ftemp = _mm512_permutexvar_epi64(x1, ss0);
__m512i temp = ss3sum1_aaray[j];
__m512i temp1 = ss7sum1_aaray[j];

temp = _mm512_adds_epu16(temp, _mm512_dbsad_epu8(ref1ftemp, ss1ftemp, 0x94));
temp = _mm512_adds_epu16(temp, _mm512_dbsad_epu8(ref2ftemp, ss1ftemp, 0xE9));
temp1 = _mm512_adds_epu16(temp1, _mm512_dbsad_epu8(ref3ftemp, ss2ftemp, 0x94));
temp1 = _mm512_adds_epu16(temp1, _mm512_dbsad_epu8(ref4ftemp, ss2ftemp, 0xE9));
ss3sum1_aaray[j] = temp;
ss7sum1_aaray[j] = temp1;

}

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8 changes: 8 additions & 0 deletions Source/Lib/ASM_AVX2/EbTransforms_AVX2.h
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Expand Up @@ -11,6 +11,14 @@
extern "C" {
#endif

#ifdef VNNI_SUPPORT
#define EbHevcTransform32_INTRIN EbHevcTransform32_VNNI_INTRIN
#else
#define EbHevcTransform32_INTRIN EbHevcTransform32_AVX2_INTRIN
#endif



void QuantizeInvQuantize8x8_AVX2_INTRIN(
EB_S16 *coeff,
const EB_U32 coeffStride,
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291 changes: 233 additions & 58 deletions Source/Lib/ASM_AVX2/EbTransforms_Intrinsic_AVX2.c
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194 changes: 194 additions & 0 deletions Source/Lib/ASM_AVX2/EbTransforms_Intrinsic_VNNI.c
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@@ -0,0 +1,194 @@
#include "EbTransforms_AVX2.h"
#include "EbDefinitions.h"

#include <emmintrin.h>
#include <immintrin.h>

#ifdef VNNI_SUPPORT

#ifdef __GNUC__
__attribute__((aligned(16)))
#endif
static EB_ALIGN(32) const EB_S16 EbHevcCoeff_tbl_AVX2[48 * 16] =
{
64, 64, 89, 75, 83, 36, 75, -18, 64, 64, 89, 75, 83, 36, 75, -18, 64, -64, 50, -89, 36, -83, 18, -50, 64, -64, 50, -89, 36, -83, 18, -50,
64, 64, 50, 18, -36, -83, -89, -50, 64, 64, 50, 18, -36, -83, -89, -50, -64, 64, 18, 75, 83, -36, 75, -89, -64, 64, 18, 75, 83, -36, 75, -89,
64, 64, -18, -50, -83, -36, 50, 89, 64, 64, -18, -50, -83, -36, 50, 89, 64, -64, -75, -18, -36, 83, 89, -75, 64, -64, -75, -18, -36, 83, 89, -75,
64, 64, -75, -89, 36, 83, 18, -75, 64, 64, -75, -89, 36, 83, 18, -75, -64, 64, 89, -50, -83, 36, 50, -18, -64, 64, 89, -50, -83, 36, 50, -18,
90, 87, 87, 57, 80, 9, 70, -43, 90, 87, 87, 57, 80, 9, 70, -43, 57, -80, 43, -90, 25, -70, 9, -25, 57, -80, 43, -90, 25, -70, 9, -25,
80, 70, 9, -43, -70, -87, -87, 9, 80, 70, 9, -43, -70, -87, -87, 9, -25, 90, 57, 25, 90, -80, 43, -57, -25, 90, 57, 25, 90, -80, 43, -57,
57, 43, -80, -90, -25, 57, 90, 25, 57, 43, -80, -90, -25, 57, 90, 25, -9, -87, -87, 70, 43, 9, 70, -80, -9, -87, -87, 70, 43, 9, 70, -80,
25, 9, -70, -25, 90, 43, -80, -57, 25, 9, -70, -25, 90, 43, -80, -57, 43, 70, 9, -80, -57, 87, 87, -90, 43, 70, 9, -80, -57, 87, 87, -90,
90, 90, 90, 82, 88, 67, 85, 46, 90, 90, 90, 82, 88, 67, 85, 46, 82, 22, 78, -4, 73, -31, 67, -54, 82, 22, 78, -4, 73, -31, 67, -54,
61, -73, 54, -85, 46, -90, 38, -88, 61, -73, 54, -85, 46, -90, 38, -88, 31, -78, 22, -61, 13, -38, 4, -13, 31, -78, 22, -61, 13, -38, 4, -13,
88, 85, 67, 46, 31, -13, -13, -67, 88, 85, 67, 46, 31, -13, -13, -67, -54, -90, -82, -73, -90, -22, -78, 38, -54, -90, -82, -73, -90, -22, -78, 38,
-46, 82, -4, 88, 38, 54, 73, -4, -46, 82, -4, 88, 38, 54, 73, -4, 90, -61, 85, -90, 61, -78, 22, -31, 90, -61, 85, -90, 61, -78, 22, -31,
82, 78, 22, -4, -54, -82, -90, -73, 82, 78, 22, -4, -54, -82, -90, -73, -61, 13, 13, 85, 78, 67, 85, -22, -61, 13, 13, 85, 78, 67, 85, -22,
31, -88, -46, -61, -90, 31, -67, 90, 31, -88, -46, -61, -90, 31, -67, 90, 4, 54, 73, -38, 88, -90, 38, -46, 4, 54, 73, -38, 88, -90, 38, -46,
73, 67, -31, -54, -90, -78, -22, 38, 73, 67, -31, -54, -90, -78, -22, 38, 78, 85, 67, -22, -38, -90, -90, 4, 78, 85, 67, -22, -38, -90, -90, 4,
-13, 90, 82, 13, 61, -88, -46, -31, -13, 90, 82, 13, 61, -88, -46, -31, -88, 82, -4, 46, 85, -73, 54, -61, -88, 82, -4, 46, 85, -73, 54, -61,
61, 54, -73, -85, -46, -4, 82, 88, 61, 54, -73, -85, -46, -4, 82, 88, 31, -46, -88, -61, -13, 82, 90, 13, 31, -46, -88, -61, -13, 82, 90, 13,
-4, -90, -90, 38, 22, 67, 85, -78, -4, -90, -90, 38, 22, 67, 85, -78, -38, -22, -78, 90, 54, -31, 67, -73, -38, -22, -78, 90, 54, -31, 67, -73,
46, 38, -90, -88, 38, 73, 54, -4, 46, 38, -90, -88, 38, 73, 54, -4, -90, -67, 31, 90, 61, -46, -88, -31, -90, -67, 31, 90, 61, -46, -88, -31,
22, 85, 67, -78, -85, 13, 13, 61, 22, 85, 67, -78, -85, 13, 13, 61, 73, -90, -82, 54, 4, 22, 78, -82, 73, -90, -82, 54, 4, 22, 78, -82,
31, 22, -78, -61, 90, 85, -61, -90, 31, 22, -78, -61, 90, 85, -61, -90, 4, 73, 54, -38, -88, -4, 82, 46, 4, 73, 54, -38, -88, -4, 82, 46,
-38, -78, -22, 90, 73, -82, -90, 54, -38, -78, -22, 90, 73, -82, -90, 54, 67, -13, -13, -31, -46, 67, 85, -88, 67, -13, -13, -31, -46, 67, 85, -88,
13, 4, -38, -13, 61, 22, -78, -31, 13, 4, -38, -13, 61, 22, -78, -31, 88, 38, -90, -46, 85, 54, -73, -61, 88, 38, -90, -46, 85, 54, -73, -61,
54, 67, -31, -73, 4, 78, 22, -82, 54, 67, -31, -73, 4, 78, 22, -82, -46, 85, 67, -88, -82, 90, 90, -90, -46, 85, 67, -88, -82, 90, 90, -90
};

extern void EbHevcTransform32_VNNI_INTRIN(EB_S16 *src, EB_U32 src_stride, EB_S16 *dst, EB_U32 dst_stride, EB_U32 shift)
{
EB_U32 i;
__m128i s0;
__m256i o0;
const __m256i *coeff32 = (const __m256i *)EbHevcCoeff_tbl_AVX2;
shift &= 0x0000FFFF; // Redundant code to fix Visual Studio 2012 AVX2 compiler error
s0 = _mm_cvtsi32_si128(shift);
o0 = _mm256_set1_epi32(1 << (shift - 1));

for (i = 0; i < 16; i++)
{
__m256i x0, x1, x2, x3,sox0,sox5,soxa,soxf,s1x0,s1x5,s1xa,s1xf;
__m256i y0, y1, y2, y3;
__m256i aa4, aa5, aa6, aa7;
__m256i a0, a1, a2, a3, a4, a5, a6, a7;
__m256i b0, b1, b2, b3, b4, b5, b6, b7;

x0 = _mm256_insertf128_si256(_mm256_castsi128_si256(_mm_loadu_si128((const __m128i *)(src + 0x00))), _mm_loadu_si128((const __m128i *)(src + src_stride + 0x00)), 0x1);
x1 = _mm256_insertf128_si256(_mm256_castsi128_si256(_mm_loadu_si128((const __m128i *)(src + 0x08))), _mm_loadu_si128((const __m128i *)(src + src_stride + 0x08)), 0x1);
x2 = _mm256_insertf128_si256(_mm256_castsi128_si256(_mm_loadu_si128((const __m128i *)(src + 0x10))), _mm_loadu_si128((const __m128i *)(src + src_stride + 0x10)), 0x1);
x3 = _mm256_insertf128_si256(_mm256_castsi128_si256(_mm_loadu_si128((const __m128i *)(src + 0x18))), _mm_loadu_si128((const __m128i *)(src + src_stride + 0x18)), 0x1);

// 32-point butterfly
x2 = _mm256_shuffle_epi8(x2, _mm256_setr_epi8(14, 15, 12, 13, 10, 11, 8, 9, 6, 7, 4, 5, 2, 3, 0, 1, 14, 15, 12, 13, 10, 11, 8, 9, 6, 7, 4, 5, 2, 3, 0, 1));
x3 = _mm256_shuffle_epi8(x3, _mm256_setr_epi8(14, 15, 12, 13, 10, 11, 8, 9, 6, 7, 4, 5, 2, 3, 0, 1, 14, 15, 12, 13, 10, 11, 8, 9, 6, 7, 4, 5, 2, 3, 0, 1));

y0 = _mm256_add_epi16(x0, x3);
y1 = _mm256_add_epi16(x1, x2);

y2 = _mm256_sub_epi16(x0, x3);
y3 = _mm256_sub_epi16(x1, x2);

// 16-point butterfly
y1 = _mm256_shuffle_epi8(y1, _mm256_setr_epi8(14, 15, 12, 13, 10, 11, 8, 9, 6, 7, 4, 5, 2, 3, 0, 1, 14, 15, 12, 13, 10, 11, 8, 9, 6, 7, 4, 5, 2, 3, 0, 1));

x0 = _mm256_add_epi16(y0, y1);
x1 = _mm256_sub_epi16(y0, y1);

x2 = y2;
x3 = y3;


sox0 = _mm256_shuffle_epi32(x0, 0x00);
sox5 = _mm256_shuffle_epi32(x0, 0x55);
soxa = _mm256_shuffle_epi32(x0, 0xaa);
soxf = _mm256_shuffle_epi32(x0, 0xff);
s1x0 = _mm256_shuffle_epi32(x1, 0x00);
s1x5 = _mm256_shuffle_epi32(x1, 0x55);
s1xa = _mm256_shuffle_epi32(x1, 0xaa);
s1xf = _mm256_shuffle_epi32(x1, 0xff);

a0 = _mm256_madd_epi16(sox0, coeff32[0]);

a0 = _mm256_dpwssd_epi32(a0, sox5, coeff32[2]);
a0 = _mm256_dpwssd_epi32(a0, soxa, coeff32[4]);
a0 = _mm256_dpwssd_epi32(a0, soxf, coeff32[6]);

a1 = _mm256_madd_epi16(sox0, coeff32[1]);
a1 = _mm256_dpwssd_epi32(a1, sox5, coeff32[3]);
a1 = _mm256_dpwssd_epi32(a1, soxa, coeff32[5]);
a1 = _mm256_dpwssd_epi32(a1, soxf, coeff32[7]);

a2 = _mm256_madd_epi16(s1x0, coeff32[8]);
a2 = _mm256_dpwssd_epi32(a2, s1x5, coeff32[10]);
a2 = _mm256_dpwssd_epi32(a2, s1xa, coeff32[12]);
a2 = _mm256_dpwssd_epi32(a2, s1xf, coeff32[14]);

a3 = _mm256_madd_epi16(s1x0, coeff32[9]);
a3 = _mm256_dpwssd_epi32(a3, s1x5, coeff32[11]);
a3 = _mm256_dpwssd_epi32(a3, s1xa, coeff32[13]);
a3 = _mm256_dpwssd_epi32(a3, s1xf, coeff32[15]);

sox0 = _mm256_shuffle_epi32(x2, 0x00);
sox5 = _mm256_shuffle_epi32(x2, 0x55);
soxa = _mm256_shuffle_epi32(x2, 0xaa);
soxf = _mm256_shuffle_epi32(x2, 0xff);
s1x0 = _mm256_shuffle_epi32(x3, 0x00);
s1x5 = _mm256_shuffle_epi32(x3, 0x55);
s1xa = _mm256_shuffle_epi32(x3, 0xaa);
s1xf = _mm256_shuffle_epi32(x3, 0xff);

a4 = _mm256_madd_epi16(sox0, coeff32[16]);
a4 = _mm256_dpwssd_epi32(a4, sox5, coeff32[20]);
a4 = _mm256_dpwssd_epi32(a4, soxa, coeff32[24]);
a4 = _mm256_dpwssd_epi32(a4, soxf, coeff32[28]);
a4 = _mm256_dpwssd_epi32(a4, s1x0, coeff32[32]);
a4 = _mm256_dpwssd_epi32(a4, s1x5, coeff32[36]);
a4 = _mm256_dpwssd_epi32(a4, s1xa, coeff32[40]);
a4 = _mm256_dpwssd_epi32(a4, s1xf, coeff32[44]);

a5 = _mm256_madd_epi16(sox0, coeff32[17]);
a5 = _mm256_dpwssd_epi32(a5, sox5, coeff32[21]);
a5 = _mm256_dpwssd_epi32(a5, soxa, coeff32[25]);
a5 = _mm256_dpwssd_epi32(a5, soxf, coeff32[29]);
a5 = _mm256_dpwssd_epi32(a5, s1x0, coeff32[33]);
a5 = _mm256_dpwssd_epi32(a5, s1x5, coeff32[37]);
a5 = _mm256_dpwssd_epi32(a5, s1xa, coeff32[41]);
a5 = _mm256_dpwssd_epi32(a5, s1xf, coeff32[45]);

a6 = _mm256_madd_epi16(sox0, coeff32[18]);
a6 = _mm256_dpwssd_epi32(a6, sox5, coeff32[22]);
a6 = _mm256_dpwssd_epi32(a6, soxa, coeff32[26]);
a6 = _mm256_dpwssd_epi32(a6, soxf, coeff32[30]);
a6 = _mm256_dpwssd_epi32(a6, s1x0, coeff32[34]);
a6 = _mm256_dpwssd_epi32(a6, s1x5, coeff32[38]);
a6 = _mm256_dpwssd_epi32(a6, s1xa, coeff32[42]);
a6 = _mm256_dpwssd_epi32(a6, s1xf, coeff32[46]);

a7 = _mm256_madd_epi16(sox0, coeff32[19]);
a7 = _mm256_dpwssd_epi32(a7, sox5, coeff32[23]);
a7 = _mm256_dpwssd_epi32(a7, soxa, coeff32[27]);
a7 = _mm256_dpwssd_epi32(a7, soxf, coeff32[31]);
a7 = _mm256_dpwssd_epi32(a7, s1x0, coeff32[35]);
a7 = _mm256_dpwssd_epi32(a7, s1x5, coeff32[39]);
a7 = _mm256_dpwssd_epi32(a7, s1xa, coeff32[43]);
a7 = _mm256_dpwssd_epi32(a7, s1xf, coeff32[47]);

b0 = _mm256_sra_epi32(_mm256_add_epi32(a0, o0), s0);
b1 = _mm256_sra_epi32(_mm256_add_epi32(a1, o0), s0);
b2 = _mm256_sra_epi32(_mm256_add_epi32(a2, o0), s0);
b3 = _mm256_sra_epi32(_mm256_add_epi32(a3, o0), s0);
b4 = _mm256_sra_epi32(_mm256_add_epi32(a4, o0), s0);
b5 = _mm256_sra_epi32(_mm256_add_epi32(a5, o0), s0);
b6 = _mm256_sra_epi32(_mm256_add_epi32(a6, o0), s0);
b7 = _mm256_sra_epi32(_mm256_add_epi32(a7, o0), s0);

x0 = _mm256_packs_epi32(b0, b1);
x1 = _mm256_packs_epi32(b2, b3);
x2 = _mm256_packs_epi32(b4, b5);
x3 = _mm256_packs_epi32(b6, b7);

y0 = _mm256_unpacklo_epi16(x0, x1);
y1 = _mm256_unpackhi_epi16(x0, x1);
y2 = x2;
y3 = x3;
x0 = _mm256_unpacklo_epi16(y0, y2);
x1 = _mm256_unpackhi_epi16(y0, y2);
x2 = _mm256_unpacklo_epi16(y1, y3);
x3 = _mm256_unpackhi_epi16(y1, y3);

y0 = _mm256_insertf128_si256(_mm256_castsi128_si256(_mm256_extracti128_si256(x0, 0)), _mm256_extracti128_si256(x1, 0), 0x1);
y1 = _mm256_insertf128_si256(_mm256_castsi128_si256(_mm256_extracti128_si256(x2, 0)), _mm256_extracti128_si256(x3, 0), 0x1);
y2 = _mm256_insertf128_si256(_mm256_castsi128_si256(_mm256_extracti128_si256(x0, 1)), _mm256_extracti128_si256(x1, 1), 0x1);
y3 = _mm256_insertf128_si256(_mm256_castsi128_si256(_mm256_extracti128_si256(x2, 1)), _mm256_extracti128_si256(x3, 1), 0x1);
_mm256_storeu_si256((__m256i *)(dst + 0x00), y0);
_mm256_storeu_si256((__m256i *)(dst + 0x10), y1);
_mm256_storeu_si256((__m256i *)(dst + dst_stride + 0x00), y2);
_mm256_storeu_si256((__m256i *)(dst + dst_stride + 0x10), y3);

src += 2 * src_stride;
dst += 2 * dst_stride;
}
}
#endif
8 changes: 6 additions & 2 deletions Source/Lib/ASM_SSSE3/CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,9 @@ include_directories(${PROJECT_SOURCE_DIR}/Source/API/

set(flags_to_test
-mssse3
-mavx512bw
-mavx512vnni
-mavx512vl
-msse4.1
-static-intel)

Expand All @@ -40,9 +43,9 @@ foreach(cflag ${flags_to_test})
endforeach()

if(CMAKE_C_COMPILER_ID STREQUAL "Intel")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -w")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -w ")
if(COMPILE_AS_CPP)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -w")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -w ")
endif()
endif()

Expand All @@ -52,6 +55,7 @@ set(ASM_SSSE3_SOURCE
EbDeblockingFilter_Intrinsic_SSSE3.c
EbIntraPrediction16bit_Intrinsic_SSSE3.c
EbMcp_Intrinsic_SSSE3.c
EbMcp_Intrinsic_AVX512VNNI.c
EbSaoApplication_Intrinsic_SSSE3.c
EbTransforms_Intrinsic_SSSE3.c)

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