static void imdct36(INTFLOAT *out, INTFLOAT *buf, INTFLOAT *in, INTFLOAT *win) { int i, j; INTFLOAT t0, t1, t2, t3, s0, s1, s2, s3; INTFLOAT tmp[18], *tmp1, *in1; for (i = 17; i >= 1; i--) in[i] += in[i-1]; for (i = 17; i >= 3; i -= 2) in[i] += in[i-2]; for (j = 0; j < 2; j++) { tmp1 = tmp + j; in1 = in + j; t2 = in1[2*4] + in1[2*8] - in1[2*2]; t3 = in1[2*0] + SHR(in1[2*6],1); t1 = in1[2*0] - in1[2*6]; tmp1[ 6] = t1 - SHR(t2,1); tmp1[16] = t1 + t2; t0 = MULH3(in1[2*2] + in1[2*4] , C2, 2); t1 = MULH3(in1[2*4] - in1[2*8] , -2*C8, 1); t2 = MULH3(in1[2*2] + in1[2*8] , -C4, 2); tmp1[10] = t3 - t0 - t2; tmp1[ 2] = t3 + t0 + t1; tmp1[14] = t3 + t2 - t1; tmp1[ 4] = MULH3(in1[2*5] + in1[2*7] - in1[2*1], -C3, 2); t2 = MULH3(in1[2*1] + in1[2*5], C1, 2); t3 = MULH3(in1[2*5] - in1[2*7], -2*C7, 1); t0 = MULH3(in1[2*3], C3, 2); t1 = MULH3(in1[2*1] + in1[2*7], -C5, 2); tmp1[ 0] = t2 + t3 + t0; tmp1[12] = t2 + t1 - t0; tmp1[ 8] = t3 - t1 - t0; } i = 0; for (j = 0; j < 4; j++) { t0 = tmp[i]; t1 = tmp[i + 2]; s0 = t1 + t0; s2 = t1 - t0; t2 = tmp[i + 1]; t3 = tmp[i + 3]; s1 = MULH3(t3 + t2, icos36h[ j], 2); s3 = MULLx(t3 - t2, icos36 [8 - j], FRAC_BITS); t0 = s0 + s1; t1 = s0 - s1; out[(9 + j) * SBLIMIT] = MULH3(t1, win[ 9 + j], 1) + buf[4*(9 + j)]; out[(8 - j) * SBLIMIT] = MULH3(t1, win[ 8 - j], 1) + buf[4*(8 - j)]; buf[4 * ( 9 + j )] = MULH3(t0, win[MDCT_BUF_SIZE/2 + 9 + j], 1); buf[4 * ( 8 - j )] = MULH3(t0, win[MDCT_BUF_SIZE/2 + 8 - j], 1); t0 = s2 + s3; t1 = s2 - s3; out[(9 + 8 - j) * SBLIMIT] = MULH3(t1, win[ 9 + 8 - j], 1) + buf[4*(9 + 8 - j)]; out[ j * SBLIMIT] = MULH3(t1, win[ j], 1) + buf[4*( j)]; buf[4 * ( 9 + 8 - j )] = MULH3(t0, win[MDCT_BUF_SIZE/2 + 9 + 8 - j], 1); buf[4 * ( j )] = MULH3(t0, win[MDCT_BUF_SIZE/2 + j], 1); i += 4; } s0 = tmp[16]; s1 = MULH3(tmp[17], icos36h[4], 2); t0 = s0 + s1; t1 = s0 - s1; out[(9 + 4) * SBLIMIT] = MULH3(t1, win[ 9 + 4], 1) + buf[4*(9 + 4)]; out[(8 - 4) * SBLIMIT] = MULH3(t1, win[ 8 - 4], 1) + buf[4*(8 - 4)]; buf[4 * ( 9 + 4 )] = MULH3(t0, win[MDCT_BUF_SIZE/2 + 9 + 4], 1); buf[4 * ( 8 - 4 )] = MULH3(t0, win[MDCT_BUF_SIZE/2 + 8 - 4], 1); }