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LibM: Add scalbn and associated functions

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Also implement ldexp in terms of them, and add ldexpl
This commit is contained in:
Mițca Dumitru 2021-03-07 22:23:57 +02:00 • committed by Andreas Kling
parent 8f7aa1e03a
commit 87b61b0eef
3 changed files with 88 additions and 2 deletions
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17
Userland/Tests/LibM/test-math.cpp
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@ -26,6 +26,7 @@
#include <AK/TestSuite.h>
#include <float.h>
#include <math.h>
TEST_CASE(trig)
@ -203,4 +204,20 @@ TEST_CASE(nextafter)
EXPECT_EQ(nextafter_translator(Extractor(0x1, 0x419, 0x7d78400000000), Extractor(0x0, 0x0, 0x1)), Extractor(0x1, 0x419, 0x7d783ffffffff));
}
TEST_CASE(scalbn)
{
EXPECT(isnan(scalbn(NAN, 3)));
EXPECT(!isfinite(scalbn(INFINITY, 5)));
EXPECT_EQ(scalbn(0, 3), 0);
EXPECT_EQ(scalbn(15.3, 0), 15.3);
EXPECT_EQ(scalbn(0x0.0000000000008p-1022, 16), 0x0.0000000000008p-1006);
static constexpr auto biggest_subnormal = DBL_MIN - DBL_TRUE_MIN;
auto smallest_normal = scalbn(biggest_subnormal, 1);
Extractor ex(smallest_normal);
EXPECT(ex.exponent != 0);
EXPECT_EQ(scalbn(2.0, 4), 32.0);
}
TEST_MAIN(Math)