search for: vmulq_f32

...CE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS + SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +*/ + +#include "../kiss_fft.h" +#include <arm_neon.h> + +#define C_MUL_NEON(m, a, b, t, ones, tv) \ + do{ \ + t = vrev64q_f32(b); \ + m = vmulq_f32(a, b); \ + m = vmulq_f32(m, ones); \ + t = vmulq_f32(a, t); \ + tv = vtrnq_f32(m, t); \ + m = vaddq_f32(tv.val[0], tv.val[1]); \ + }while(0) + +#define ONES_MINUS_ONE 0xbf8000003f800000 //{-1.0, 1.0} +#define MINUS_ONE 0xbf800000bf800000 // {-1.0, -1.0} + +...

...way, but that wasn't true for my real situation) then the temporary "result" seems to be kept in the generated code for the test function, and triggers the bad penalty of a load after a NEON store. vec4 operator* (vec4& a, vec4& b) { vec4 result; float32x4_t result_data = vmulq_f32(vld1q_f32(a.data), vld1q_f32(b.data)); vst1q_f32(result.data, result_data); return result; } __Z16TestVec4MultiplyR4vec4S0_S0_: @ BB#0: sub sp, #16 vld1.32 {d16, d17}, [r1] vld1.32 {d18, d19}, [r0] mov r0, sp vmul.f32 q8, q9, q8 vst1.32 {d16, d17}, [r0] vld1.32 {d16, d17}, [r0] vst1.32...

...intrinsics that prevents the compiler optimizing out the redundant store on the stack? Is there any hope for this improving in the future, or anything I can do now to improve the generated code? > > If I had to guess, I'd say the intrinsic got in the way of recognising > the pattern. vmulq_f32 got correctly lowered to IR as "fmul", but > vld1q_f32 is still kept as an intrinsic, so register allocators and > schedulers get confused and, when lowering to assembly, you're left > with garbage around it. > > Creating a bug for this is probably the best thing to do...

Hello, This patch introduces ARM NEON Intrinsics to optimize kf_bfly4 routine in celt part of libopus. Using NEON optimized kf_bfly4(_neon) routine helped improve performance of opus_fft_impl function by about 21.4%. The end use case was decoding a music opus ogg file. The end use case saw performance improvement of about 4.47%. This patch has 2 components i. Actual neon code to improve

...s the compiler optimizing out the redundant store on the stack? Is there any hope for this improving in the future, or anything I can do now to improve the generated code? >>> >>> If I had to guess, I'd say the intrinsic got in the way of recognising >>> the pattern. vmulq_f32 got correctly lowered to IR as "fmul", but >>> vld1q_f32 is still kept as an intrinsic, so register allocators and >>> schedulers get confused and, when lowering to assembly, you're left >>> with garbage around it. > > FWIW, with top of tree clang, I...

libvorbis does not currently have any simd/vectorization. Following patches add generic framework for simd/vectorization and on top, add ARM-NEON simd vectorization using intrinsics. I was able to get over 34% performance improvement on my Beaglebone Black which is single Cortex-A8 based CPU. You can find more information on metrics and procedure I used to measure at