git subrepo clone https://github.com/libretro/libretro-common.git deps/libretro-common

[pcsx_rearmed.git] / deps / libretro-common / audio / conversion / float_to_s16_neon.S

diff --git a/deps/libretro-common/audio/conversion/float_to_s16_neon.S b/deps/libretro-common/audio/conversion/float_to_s16_neon.S
new file mode 100644 (file)
index 0000000..951084f
--- /dev/null
+++ b/deps/libretro-common/audio/conversion/float_to_s16_neon.S
@@ -0,0 +1,69 @@
+/* Copyright  (C) 2010-2020 The RetroArch team
+ *
+ * ---------------------------------------------------------------------------------------
+ * The following license statement only applies to this file (float_to_s16_neon.S).
+ * ---------------------------------------------------------------------------------------
+ *
+ * Permission is hereby granted, free of charge,
+ * to any person obtaining a copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+ * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#if defined(__ARM_NEON__) && defined(HAVE_ARM_NEON_ASM_OPTIMIZATIONS)
+
+#ifndef __MACH__
+.arm
+#endif
+
+.align 4
+.globl convert_float_s16_asm
+#ifndef __MACH__
+.type convert_float_s16_asm, %function
+#endif
+.globl _convert_float_s16_asm
+#ifndef __MACH__
+.type _convert_float_s16_asm, %function
+#endif
+# convert_float_s16_asm(int16_t *out, const float *in, size_t samples)
+convert_float_s16_asm:
+_convert_float_s16_asm:
+   # Hacky way to get a constant of 2^15.
+   # ((2^4)^2)^2 * 0.5 = 2^15
+   vmov.f32 q8, #16.0
+   vmov.f32 q9, #0.5
+   vmul.f32 q8, q8, q8
+   vmul.f32 q8, q8, q8
+   vmul.f32 q8, q8, q9
+
+1:
+   # Preload here?
+   vld1.f32 {q0-q1}, [r1]!
+
+   vmul.f32 q0, q0, q8
+   vmul.f32 q1, q1, q8
+
+   vcvt.s32.f32 q0, q0
+   vcvt.s32.f32 q1, q1
+
+   vqmovn.s32 d4, q0
+   vqmovn.s32 d5, q1
+
+   vst1.f32 {d4-d5}, [r0]!
+
+   # Guaranteed to get samples in multiples of 8.
+   subs r2, r2, #8
+   bne 1b
+
+   bx lr
+
+#endif