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Added mulHi64 intrinsics. (#477)

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This commit is contained in:
Branimir Karadžić
2026-10-28 17:16:18 +00:00
committed by GitHub
parent dae5c595b7
commit f9c90f5081
5 changed files with 247 additions and 177 deletions
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tests/math_test.cpp
+23
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@@ -1841,3 +1841,26 @@ TEST_CASE("limits", "[math]")
STATIC_REQUIRE(bx::kFloatSmallest == std::numeric_limits<float>::min() );
STATIC_REQUIRE(bx::kDoubleSmallest == std::numeric_limits<double>::min() );
}
TEST_CASE("mulHi64", "[math]")
{
STATIC_REQUIRE(0 == bx::mulHi64(0, 0) );
STATIC_REQUIRE(0 == bx::mulHi64(UINT64_MAX, 0) );
STATIC_REQUIRE(0 == bx::mulHi64(UINT64_MAX, 1) );
STATIC_REQUIRE(1 == bx::mulHi64(UINT64_C(1)<<32, UINT64_C(1)<<32) );
STATIC_REQUIRE(UINT64_MAX-1 == bx::mulHi64(UINT64_MAX, UINT64_MAX) );
STATIC_REQUIRE(UINT64_C(0x7641f3080ff92329) == bx::mulHi64(UINT64_C(0x9e3779b97f4a7c15), UINT64_C(0xbf58476d1ce4e5b9) ) );
REQUIRE(UINT64_MAX-1 == bx::mulHi64(UINT64_MAX, UINT64_MAX) );
REQUIRE(UINT64_C(0x7641f3080ff92329) == bx::mulHi64(UINT64_C(0x9e3779b97f4a7c15), UINT64_C(0xbf58476d1ce4e5b9) ) );
bx::RngMwc rng;
for (uint32_t ii = 0; ii < 100000; ++ii)
{
const uint64_t aa = (uint64_t(rng.gen() )<<32) | rng.gen();
const uint64_t bb = (uint64_t(rng.gen() )<<32) | rng.gen();
REQUIRE(bx::mulHi64Ref(aa, bb) == bx::mulHi64(aa, bb) );
}
}