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Use bit_cast to create -0.0 for floating point types to avoid compiler optimization changing sign with --ffast-math enabled.

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This commit is contained in:
Rasmus Munk Larsen
2021-06-10 19:18:50 -07:00
parent f64b2954c7
commit fc87e2cbaa
6 changed files with 16 additions and 12 deletions
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3
Eigen/src/Core/arch/AltiVec/PacketMath.h
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@@ -2260,7 +2260,8 @@ static Packet2ul p2ul_SIGN = { 0x8000000000000000ull, 0x8000000000000000ull };
static Packet2ul p2ul_PREV0DOT5 = { 0x3FDFFFFFFFFFFFFFull, 0x3FDFFFFFFFFFFFFFull };
static Packet2d p2d_ONE = { 1.0, 1.0 };
static Packet2d p2d_ZERO = reinterpret_cast<Packet2d>(p4f_ZERO);
static Packet2d p2d_MZERO = { -0.0, -0.0 };
static Packet2d p2d_MZERO = { numext::bit_cast<double>(0x8000000000000000ull),
numext::bit_cast<double>(0x8000000000000000ull) };
#ifdef _BIG_ENDIAN
static Packet2d p2d_COUNTDOWN = reinterpret_cast<Packet2d>(vec_sld(reinterpret_cast<Packet4f>(p2d_ZERO), reinterpret_cast<Packet4f>(p2d_ONE), 8));