https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118019
--- Comment #3 from Li Pan <pan2.li at intel dot com> ---
1 │ #include <stdint.h>
2 │
3 │ #define I_P1 16
4 │ #define I_P2 1344
5 │
6 │ #define HADAMARD4(d0, d1, d2, d3, s0, s1, s2, s3) {\
7 │ int t0 = s0 + s1;\
8 │ int t1 = s0 - s1;\
9 │ int t2 = s2 + s3;\
10 │ int t3 = s2 - s3;\
11 │ d0 = t0 + t2;\
12 │ d2 = t0 - t2;\
13 │ d1 = t1 + t3;\
14 │ d3 = t1 - t3;\
15 │ }
16 │
17 │ uint32_t abs2( uint32_t a )
18 │ {
19 │ uint32_t s = ((a >> 15) & 0x10001) * 0xffff;
20 │ return (a+s)^s;
21 │ }
22 │
23 │ int x264_pixel_satd_8x4 (uint8_t * pix1, int i_pix1, uint8_t * pix2,
int i_pix2)
24 │ {
25 │ uint32_t tmp[4][4];
26 │ uint32_t a0, a1, a2, a3;
27 │ int sum = 0;
28 │
29 │ for (int i = 0; i < 4; i++, pix1 += i_pix1, pix2 += i_pix2) {
30 │ a0 = (pix1[0] - pix2[0]) + ((pix1[4] - pix2[4]) << 16);
31 │ a1 = (pix1[1] - pix2[1]) + ((pix1[5] - pix2[5]) << 16);
32 │ a2 = (pix1[2] - pix2[2]) + ((pix1[6] - pix2[6]) << 16);
33 │ a3 = (pix1[3] - pix2[3]) + ((pix1[7] - pix2[7]) << 16);
34 │
35 │ HADAMARD4 (tmp[i][0], tmp[i][1], tmp[i][2], tmp[i][3],
a0,a1,a2,a3);
36 │ }
37 │
38 │ for( int i = 0; i < 4; i++ ) {
39 │ HADAMARD4 (a0, a1, a2, a3, tmp[0][i], tmp[1][i], tmp[2][i],
tmp[3][i]);
40 │ sum += abs2 (a0) + abs2 (a1) + abs2 (a2) + abs2 (a3);
41 │ }
42 │
43 │ return (((uint16_t)sum) + ((uint32_t)sum >> 16)) >> 1;
44 │ }
45 │
46 │ __attribute__((aligned(16))) uint64_t g_pix1[I_P2 * 5] = { 111, 112,
113, 114, 115, 116, 117, 118 };
47 │ __attribute__((aligned(16))) uint64_t g_pix2[I_P2 * 5] = { 211, 212,
213, 214, 215, 216, 217, 218 };
48 │ int result;
49 │
50 │ int main() {
51 │ result = x264_pixel_satd_8x4((uint8_t*)g_pix1, I_P1,
(uint8_t*)g_pix2, I_P2);
52 │ return 0;
53 │ }
../__RV64/bin/riscv64-unknown-elf-gcc satd.c -march=rv64gcv_zvl512b
-mrvv-vector-bits=zvl -O3 -g0 -mrvv-max-lmul=m2 -mvector-strict-align -o
test.salign.elf
QEMU_CPU=rv64,vlen=512,rvv_ta_all_1s=true,rvv_ma_all_1s=true,v=true,vext_spec=v1.0
~/bin/qemu/bin/qemu-riscv64 -plugin
/home/pli/repos/qemu/build/tests/tcg/plugins/libinsn.so -d plugin
test.salign.elf
total insns: 917
../__RV64/bin/riscv64-unknown-elf-gcc satd.c -march=rv64gcv_zvl512b
-mrvv-vector-bits=zvl -O3 -g0 -mrvv-max-lmul=m2 -mno-vector-strict-align -o
test.no-salign.elf
QEMU_CPU=rv64,vlen=512,rvv_ta_all_1s=true,rvv_ma_all_1s=true,v=true,vext_spec=v1.0
~/bin/qemu/bin/qemu-riscv64 -plugin
/home/pli/repos/qemu/build/tests/tcg/plugins/libinsn.so -d plugin
test.no-salign.elf
total insns: 755
