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add feature to convert FP32(float) to FP16(half)

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* check compiler support
  * check HW support before executing
  * add test doing round trip conversion from / to FP32
  * treat array correctly if size is not multiple of 4
  * add declaration to prevent warning
  * make it possible to enable fp16 on 32bit ARM
  * let the conversion possible on non-supported HW, too.
  * add test using both HW and SW implementation
This commit is contained in:
Tomoaki Teshima
2016-05-21 21:31:33 +09:00
parent c3d1f94ee6
commit b2ad7cd9c0
8 changed files with 459 additions and 5 deletions
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modules/core/src/system.cpp
+10 -2
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@@ -291,6 +291,7 @@ struct HWFeatures
f.have[CV_CPU_SSE4_2] = (cpuid_data[2] & (1<<20)) != 0;
f.have[CV_CPU_POPCNT] = (cpuid_data[2] & (1<<23)) != 0;
f.have[CV_CPU_AVX] = (((cpuid_data[2] & (1<<28)) != 0)&&((cpuid_data[2] & (1<<27)) != 0));//OS uses XSAVE_XRSTORE and CPU support AVX
f.have[CV_CPU_FP16] = (cpuid_data[2] & (1<<29)) != 0;
// make the second call to the cpuid command in order to get
// information about extended features like AVX2
@@ -338,7 +339,8 @@ struct HWFeatures
#if defined ANDROID || defined __linux__
#ifdef __aarch64__
f.have[CV_CPU_NEON] = true;
#else
f.have[CV_CPU_FP16] = true;
#elif defined __arm__
int cpufile = open("/proc/self/auxv", O_RDONLY);
if (cpufile >= 0)
@@ -351,6 +353,7 @@ struct HWFeatures
if (auxv.a_type == AT_HWCAP)
{
f.have[CV_CPU_NEON] = (auxv.a_un.a_val & 4096) != 0;
f.have[CV_CPU_FP16] = (auxv.a_un.a_val & 2) != 0;
break;
}
}
@@ -358,8 +361,13 @@ struct HWFeatures
close(cpufile);
}
#endif
#elif (defined __clang__ || defined __APPLE__) && (defined __ARM_NEON__ || (defined __ARM_NEON && defined __aarch64__))
#elif (defined __clang__ || defined __APPLE__)
#if (defined __ARM_NEON__ || (defined __ARM_NEON && defined __aarch64__))
f.have[CV_CPU_NEON] = true;
#endif
#if (defined __ARM_FP && (((__ARM_FP & 0x2) != 0) && defined __ARM_NEON__))
f.have[CV_CPU_FP16] = true;
#endif
#endif
return f;