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Core: Implement numext::nextafter for all floating point types

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libeigen/eigen!2834

Closes #2937

Co-authored-by: Rasmus Munk Larsen <rmlarsen@gmail.com>
This commit is contained in:
Rasmus Munk Larsen
2026-08-17 21:01:28 -07:00
co-authored by Rasmus Munk Larsen
parent e857597ca0
commit 5593b98453
6 changed files with 133 additions and 8 deletions
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test/bfloat16_float.cpp
+4 -2
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@@ -384,9 +384,11 @@ void test_nextafter() {
std::numeric_limits<bfloat16>::infinity());
VERIFY(numext::nextafter(-(std::numeric_limits<bfloat16>::max)(), -std::numeric_limits<bfloat16>::infinity()) ==
-std::numeric_limits<bfloat16>::infinity());
// The neighbors of ±0 are the smallest subnormals with the sign of the
// direction, matching std::nextafter (IEEE-754 nextUp/nextDown of zero).
VERIFY_BFLOAT16_BITS_EQUAL(numext::nextafter(bfloat16(0.0f), bfloat16(1.0f)), 0x0001);
VERIFY_BFLOAT16_BITS_EQUAL(numext::nextafter(bfloat16(-0.0f), bfloat16(1.0f)), 0x0000);
VERIFY_BFLOAT16_BITS_EQUAL(numext::nextafter(bfloat16(0.0f), bfloat16(-1.0f)), 0x8000);
VERIFY_BFLOAT16_BITS_EQUAL(numext::nextafter(bfloat16(-0.0f), bfloat16(1.0f)), 0x0001);
VERIFY_BFLOAT16_BITS_EQUAL(numext::nextafter(bfloat16(0.0f), bfloat16(-1.0f)), 0x8001);
VERIFY_BFLOAT16_BITS_EQUAL(numext::nextafter(bfloat16(-0.0f), bfloat16(-1.0f)), 0x8001);
VERIFY_BFLOAT16_BITS_EQUAL(numext::nextafter(bfloat16(0.0f), bfloat16(-0.0f)), 0x8000);
VERIFY_BFLOAT16_BITS_EQUAL(numext::nextafter(bfloat16(-0.0f), bfloat16(0.0f)), 0x0000);