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Diffstat (limited to 'Transceiver52M/arm/scale_neon.S')
| -rw-r--r-- | Transceiver52M/arm/scale_neon.S | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/Transceiver52M/arm/scale_neon.S b/Transceiver52M/arm/scale_neon.S new file mode 100644 index 0000000..a66fbe5 --- /dev/null +++ b/Transceiver52M/arm/scale_neon.S @@ -0,0 +1,50 @@ +/* + * ARM NEON Scaling + * Copyright (C) 2013 Thomas Tsou <tom@tsou.cc> + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + + .syntax unified + .text + .align 2 + .global neon_scale_4n + .type neon_scale_4n, %function +neon_scale_4n: + push {r4, lr} + ldr r4, =32 + + vld1.64 d0, [r1] + vmov.32 s4, s1 + vmov.32 s1, s0 + vmov.64 d1, d0 + vmov.32 s5, s4 + vmov.64 d3, d2 +.loop_mul_const: + vld2.32 {q2-q3}, [r0], r4 + + vmul.f32 q8, q0, q2 + vmul.f32 q9, q1, q3 + vmul.f32 q10, q0, q3 + vmul.f32 q11, q1, q2 + vsub.f32 q8, q8, q9 + vadd.f32 q9, q10, q11 + + vst2.32 {q8-q9}, [r2]! + subs r3, #1 + bne .loop_mul_const + pop {r4, pc} + .size neon_scale_4n, .-neon_scale_4n + .section .note.GNU-stack,"",%progbits |