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Fix bfloat16 casts

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If we have explicit conversion operators available (C++11) we define
explicit casts from bfloat16 to other types. If not (C++03), we don't
define conversion operators but rely on implicit conversion chains from
bfloat16 over float to other types.
This commit is contained in:
David Tellenbach
2020-07-23 20:55:06 +00:00
committed by Rasmus Munk Larsen
parent 2ce2f51989
commit c1ffe452fc
2 changed files with 26 additions and 66 deletions
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17
test/bfloat16_float.cpp
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@@ -84,10 +84,20 @@ void test_conversion()
VERIFY_IS_EQUAL(bfloat16(false).value, 0x0000);
VERIFY_IS_EQUAL(bfloat16(true).value, 0x3f80);
// Conversion to float.
// Conversion to bool
VERIFY_IS_EQUAL(static_cast<bool>(bfloat16(3)), true);
VERIFY_IS_EQUAL(static_cast<bool>(bfloat16(0.33333f)), true);
VERIFY_IS_EQUAL(bfloat16(-0.0), false);
VERIFY_IS_EQUAL(static_cast<bool>(bfloat16(0.0)), false);
// Explicit conversion to float.
VERIFY_IS_EQUAL(static_cast<float>(bfloat16(__bfloat16_raw(0x0000))), 0.0f);
VERIFY_IS_EQUAL(static_cast<float>(bfloat16(__bfloat16_raw(0x3f80))), 1.0f);
// Implicit conversion to float
VERIFY_IS_EQUAL(bfloat16(__bfloat16_raw(0x0000)), 0.0f);
VERIFY_IS_EQUAL(bfloat16(__bfloat16_raw(0x3f80)), 1.0f);
// Zero representations
VERIFY_IS_EQUAL(bfloat16(0.0f), bfloat16(0.0f));
VERIFY_IS_EQUAL(bfloat16(-0.0f), bfloat16(0.0f));
@@ -101,6 +111,11 @@ void test_conversion()
denorm = nextafterf(denorm, 1.0f)) {
bfloat16 bf_trunc = Eigen::bfloat16_impl::truncate_to_bfloat16(denorm);
VERIFY_IS_EQUAL(static_cast<float>(bf_trunc), 0.0f);
// Implicit conversion of denormls to bool is correct
VERIFY_IS_EQUAL(static_cast<bool>(bfloat16(denorm)), false);
VERIFY_IS_EQUAL(bfloat16(denorm), false);
if (std::signbit(denorm)) {
VERIFY_IS_EQUAL(bf_trunc.value, 0x8000);
} else {