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/*
* Copyright (C) 2005-2018 Team Kodi
* This file is part of Kodi - https://kodi.tv
*
* SPDX-License-Identifier: GPL-2.0-or-later
* See LICENSES/README.md for more information.
*/
void Matrix4Mul(float* src_mat_1, const float* src_mat_2)
{
asm volatile (
// Store A & B leaving room at top of registers for result (q0-q3)
"vldmia %0, { q4-q7 } \n\t"
"vldmia %1, { q8-q11 } \n\t"
// result = first column of B x first row of A
"vmul.f32 q0, q8, d8[0]\n\t"
"vmul.f32 q1, q8, d10[0]\n\t"
"vmul.f32 q2, q8, d12[0]\n\t"
"vmul.f32 q3, q8, d14[0]\n\t"
// result += second column of B x second row of A
"vmla.f32 q0, q9, d8[1]\n\t"
"vmla.f32 q1, q9, d10[1]\n\t"
"vmla.f32 q2, q9, d12[1]\n\t"
"vmla.f32 q3, q9, d14[1]\n\t"
// result += third column of B x third row of A
"vmla.f32 q0, q10, d9[0]\n\t"
"vmla.f32 q1, q10, d11[0]\n\t"
"vmla.f32 q2, q10, d13[0]\n\t"
"vmla.f32 q3, q10, d15[0]\n\t"
// result += last column of B x last row of A
"vmla.f32 q0, q11, d9[1]\n\t"
"vmla.f32 q1, q11, d11[1]\n\t"
"vmla.f32 q2, q11, d13[1]\n\t"
"vmla.f32 q3, q11, d15[1]\n\t"
// output = result registers
"vstmia %1, { q0-q3 }"
: //no output
: "r" (src_mat_2), "r" (src_mat_1) // input - note *value* of pointer doesn't change
: "memory", "q0", "q1", "q2", "q3", "q4", "q5", "q6", "q7", "q8", "q9", "q10", "q11" //clobber
);
}
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