path: root/src/corelib/global/qfloat16.h
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authorAllan Sandfeld Jensen <>2017-10-16 13:54:38 +0200
committerThiago Macieira <>2017-11-21 20:01:23 +0000
commitb8e352ad378ce4ef7a517971533b02ec9c3768cb (patch)
tree1edc11dddc8784285c0ee1914e7f33d2569e6d7e /src/corelib/global/qfloat16.h
parent0ac2dca977ecc4020f51af57908a2640d00bcd9e (diff)
Add functions for fast bulk conversion of qfloat16
Both ARM and x86 can convert fp16 much faster in bulk than one at a time. This also enables hardware accelerated conversion on x86, when F16C isn't unconditionally available at compile time. This code is implemented in C to ensure that there's no leakage of inline symbols from the .obj file that was compiled by Visual Studio with AVX support. Unfortunately, simd.prf uses $(CXX) instead of $(CC) for all its sources, which means the file gets interpreted as C++ by g++, clang++ and icpc. Those compilers at least don't leak any symbols. Done-with: Thiago Macieira <> Change-Id: I9d26d99e83392861fb09564e0e8e8d76cd8483b3 Reviewed-by: Thiago Macieira <>
Diffstat (limited to 'src/corelib/global/qfloat16.h')
1 files changed, 3 insertions, 0 deletions
diff --git a/src/corelib/global/qfloat16.h b/src/corelib/global/qfloat16.h
index 10598adb1d..5855784f32 100644
--- a/src/corelib/global/qfloat16.h
+++ b/src/corelib/global/qfloat16.h
@@ -79,6 +79,9 @@ private:
+Q_CORE_EXPORT void qFloatToFloat16(qfloat16 *, const float *, qssize_t length) Q_DECL_NOTHROW;
+Q_CORE_EXPORT void qFloatFromFloat16(float *, const qfloat16 *, qssize_t length) Q_DECL_NOTHROW;
Q_REQUIRED_RESULT Q_CORE_EXPORT bool qIsInf(qfloat16 f) Q_DECL_NOTHROW; // complements qnumeric.h
Q_REQUIRED_RESULT Q_CORE_EXPORT bool qIsNaN(qfloat16 f) Q_DECL_NOTHROW; // complements qnumeric.h
Q_REQUIRED_RESULT Q_CORE_EXPORT bool qIsFinite(qfloat16 f) Q_DECL_NOTHROW; // complements qnumeric.h