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[libc][math][c23] Fix X86_Binary80 special cases for canonicalize functions. #86924

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Merged
merged 5 commits into from
Mar 28, 2024
Merged

[libc][math][c23] Fix X86_Binary80 special cases for canonicalize functions. #86924

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3ba4188
fix infinity
Sh0g0-1758 Mar 28, 2024
4aa60bf
Update unnormal
Sh0g0-1758 Mar 28, 2024
de9d099
Updated tests
Sh0g0-1758 Mar 28, 2024
af1c272
Ran formatter
Sh0g0-1758 Mar 28, 2024
464f349
Added u128 string literal
Sh0g0-1758 Mar 28, 2024
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21 changes: 12 additions & 9 deletions libc/src/__support/FPUtil/BasicOperations.h
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Original file line number Diff line number Diff line change
Expand Up @@ -185,27 +185,28 @@ LIBC_INLINE int canonicalize(T &cx, const T &x) {
// More precisely :
// Exponent | Significand | Meaning
// | Bits 63-62 | Bits 61-0 |
// All Ones | 00 | Zero | Pseudo Infinity, Value = Infinty
// All Ones | 00 | Zero | Pseudo Infinity, Value = SNaN
// All Ones | 00 | Non-Zero | Pseudo NaN, Value = SNaN
// All Ones | 01 | Anything | Pseudo NaN, Value = SNaN
// | Bit 63 | Bits 62-0 |
// All zeroes | One | Anything | Pseudo Denormal, Value =
// | | | (−1)**s × m × 2**−16382
// All Other | Zero | Anything | Unnormal, Value =
// Values | | | (−1)**s × m × 2**−16382
// All Other | Zero | Anything | Unnormal, Value = SNaN
// Values | | |
bool bit63 = sx.get_implicit_bit();
UInt128 mantissa = sx.get_explicit_mantissa();
bool bit62 = static_cast<bool>((mantissa & (1ULL << 62)) >> 62);
int exponent = sx.get_biased_exponent();
if (exponent == 0x7FFF) {
if (!bit63 && !bit62) {
if (mantissa == 0)
cx = FPBits<T>::inf(sx.sign()).get_val();
else {
if (mantissa == 0) {
cx = FPBits<T>::quiet_nan(sx.sign(), mantissa).get_val();
raise_except_if_required(FE_INVALID);
return 1;
}
cx = FPBits<T>::quiet_nan(sx.sign(), mantissa).get_val();
raise_except_if_required(FE_INVALID);
return 1;
} else if (!bit63 && bit62) {
cx = FPBits<T>::quiet_nan(sx.sign(), mantissa).get_val();
raise_except_if_required(FE_INVALID);
Expand All @@ -219,9 +220,11 @@ LIBC_INLINE int canonicalize(T &cx, const T &x) {
cx = x;
} else if (exponent == 0 && bit63)
cx = FPBits<T>::make_value(mantissa, 0).get_val();
else if (exponent != 0 && !bit63)
cx = FPBits<T>::make_value(mantissa, 0).get_val();
else if (LIBC_UNLIKELY(sx.is_signaling_nan())) {
else if (exponent != 0 && !bit63) {
cx = FPBits<T>::quiet_nan(sx.sign(), mantissa).get_val();
raise_except_if_required(FE_INVALID);
return 1;
} else if (LIBC_UNLIKELY(sx.is_signaling_nan())) {
cx =
FPBits<T>::quiet_nan(sx.sign(), sx.get_explicit_mantissa()).get_val();
raise_except_if_required(FE_INVALID);
Expand Down
4 changes: 4 additions & 0 deletions libc/test/src/math/smoke/CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -178,6 +178,7 @@ add_fp_unittest(
libc.src.math.canonicalize
libc.src.__support.FPUtil.fp_bits
libc.src.__support.FPUtil.fenv_impl
libc.src.__support.integer_literals
)

add_fp_unittest(
Expand All @@ -193,6 +194,7 @@ add_fp_unittest(
libc.src.math.canonicalizef
libc.src.__support.FPUtil.fp_bits
libc.src.__support.FPUtil.fenv_impl
libc.src.__support.integer_literals
)

add_fp_unittest(
Expand All @@ -208,6 +210,7 @@ add_fp_unittest(
libc.src.math.canonicalizef128
libc.src.__support.FPUtil.fp_bits
libc.src.__support.FPUtil.fenv_impl
libc.src.__support.integer_literals
)

add_fp_unittest(
Expand All @@ -223,6 +226,7 @@ add_fp_unittest(
libc.src.math.canonicalizel
libc.src.__support.FPUtil.fp_bits
libc.src.__support.FPUtil.fenv_impl
libc.src.__support.integer_literals
)

add_fp_unittest(
Expand Down
85 changes: 38 additions & 47 deletions libc/test/src/math/smoke/CanonicalizeTest.h
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,7 @@
#define LLVM_LIBC_TEST_SRC_MATH_SMOKE_CANONICALIZETEST_H

#include "src/__support/FPUtil/FPBits.h"
#include "src/__support/integer_literals.h"
#include "test/UnitTest/FPMatcher.h"
#include "test/UnitTest/Test.h"

Expand All @@ -22,6 +23,8 @@

#define TEST_REGULAR(x, y, expected) TEST_SPECIAL(x, y, expected, 0)

using LIBC_NAMESPACE::operator""_u128;

template <typename T>
class CanonicalizeTest : public LIBC_NAMESPACE::testing::Test {

Expand Down Expand Up @@ -55,57 +58,54 @@ class CanonicalizeTest : public LIBC_NAMESPACE::testing::Test {
T cx;
// Exponent | Significand | Meaning
// | Bits 63-62 | Bits 61-0 |
// All Ones | 00 | Zero | Pseudo Infinity, Value = Infinty

FPBits test1((UInt128(0x7FFF) << 64) + UInt128(0x0000000000000000));
// All Ones | 00 | Zero | Pseudo Infinity, Value = SNaN
FPBits test1(0x00000000'00007FFF'00000000'00000000_u128);
const T test1_val = test1.get_val();
TEST_SPECIAL(cx, test1_val, 0, 0);
EXPECT_FP_EQ(cx, inf);
TEST_SPECIAL(cx, test1_val, 1, FE_INVALID);
EXPECT_FP_EQ(cx, aNaN);

// Exponent | Significand | Meaning
// | Bits 63-62 | Bits 61-0 |
// All Ones | 00 | Non-Zero | Pseudo NaN, Value = SNaN

FPBits test2_1((UInt128(0x7FFF) << 64) + UInt128(0x0000000000000001));
FPBits test2_1(0x000000000'00007FFF'00000000'00000001_u128);
const T test2_1_val = test2_1.get_val();
TEST_SPECIAL(cx, test2_1_val, 1, FE_INVALID);
EXPECT_FP_EQ(cx, aNaN);

FPBits test2_2((UInt128(0x7FFF) << 64) + UInt128(0x0000004270000001));
FPBits test2_2(0x000000000'00007FFF'00000042'70000001_u128);
const T test2_2_val = test2_2.get_val();
TEST_SPECIAL(cx, test2_2_val, 1, FE_INVALID);
EXPECT_FP_EQ(cx, aNaN);

FPBits test2_3((UInt128(0x7FFF) << 64) + UInt128(0x0000000008261001));
FPBits test2_3(0x000000000'00007FFF'00000000'08261001_u128);
const T test2_3_val = test2_3.get_val();
TEST_SPECIAL(cx, test2_3_val, 1, FE_INVALID);
EXPECT_FP_EQ(cx, aNaN);

FPBits test2_4((UInt128(0x7FFF) << 64) + UInt128(0x0000780008261001));
FPBits test2_4(0x000000000'00007FFF'00007800'08261001_u128);
const T test2_4_val = test2_4.get_val();
TEST_SPECIAL(cx, test2_4_val, 1, FE_INVALID);
EXPECT_FP_EQ(cx, aNaN);

// Exponent | Significand | Meaning
// | Bits 63-62 | Bits 61-0 |
// All Ones | 01 | Anything | Pseudo NaN, Value = SNaN

FPBits test3_1((UInt128(0x7FFF) << 64) + UInt128(0x4000000000000000));
FPBits test3_1(0x00000000'00007FFF'40000000'00000000_u128);
const T test3_1_val = test3_1.get_val();
TEST_SPECIAL(cx, test3_1_val, 1, FE_INVALID);
EXPECT_FP_EQ(cx, aNaN);

FPBits test3_2((UInt128(0x7FFF) << 64) + UInt128(0x4000004270000001));
FPBits test3_2(0x00000000'00007FFF'40000042'70000001_u128);
const T test3_2_val = test3_2.get_val();
TEST_SPECIAL(cx, test3_2_val, 1, FE_INVALID);
EXPECT_FP_EQ(cx, aNaN);

FPBits test3_3((UInt128(0x7FFF) << 64) + UInt128(0x4000000008261001));
FPBits test3_3(0x00000000'00007FFF'40000000'08261001_u128);
const T test3_3_val = test3_3.get_val();
TEST_SPECIAL(cx, test3_3_val, 1, FE_INVALID);
EXPECT_FP_EQ(cx, aNaN);

FPBits test3_4((UInt128(0x7FFF) << 64) + UInt128(0x4007800008261001));
FPBits test3_4(0x00000000'00007FFF'40007800'08261001_u128);
const T test3_4_val = test3_4.get_val();
TEST_SPECIAL(cx, test3_4_val, 1, FE_INVALID);
EXPECT_FP_EQ(cx, aNaN);
Expand All @@ -114,65 +114,56 @@ class CanonicalizeTest : public LIBC_NAMESPACE::testing::Test {
// | Bit 63 | Bits 62-0 |
// All zeroes | One | Anything | Pseudo Denormal, Value =
// | | | (−1)**s × m × 2**−16382

FPBits test4_1((UInt128(0x0000) << 64) + UInt128(0x8000000000000000));
FPBits test4_1(0x00000000'00000000'80000000'00000000_u128);
const T test4_1_val = test4_1.get_val();
TEST_SPECIAL(cx, test4_1_val, 0, 0);
EXPECT_FP_EQ(
cx, FPBits::make_value(test4_1.get_explicit_mantissa(), 0).get_val());

FPBits test4_2((UInt128(0x0000) << 64) + UInt128(0x8000004270000001));
FPBits test4_2(0x00000000'00000000'80000042'70000001_u128);
const T test4_2_val = test4_2.get_val();
TEST_SPECIAL(cx, test4_2_val, 0, 0);
EXPECT_FP_EQ(
cx, FPBits::make_value(test4_2.get_explicit_mantissa(), 0).get_val());

FPBits test4_3((UInt128(0x0000) << 64) + UInt128(0x8000000008261001));
FPBits test4_3(0x00000000'00000000'80000000'08261001_u128);
const T test4_3_val = test4_3.get_val();
TEST_SPECIAL(cx, test4_3_val, 0, 0);
EXPECT_FP_EQ(
cx, FPBits::make_value(test4_3.get_explicit_mantissa(), 0).get_val());

// Exponent | Significand | Meaning
// | Bit 63 | Bits 62-0 |
// All Other | Zero | Anything | Unnormal, Value =
// Values | | | (−1)**s × m × 2**−16382

FPBits test5_1(UInt128(0x0000000000000001));
// All Other | Zero | Anything | Unnormal, Value = SNaN
// Values | | |
FPBits test5_1(0x00000000'00000040'00000000'00000001_u128);
const T test5_1_val = test5_1.get_val();
TEST_SPECIAL(cx, test5_1_val, 0, 0);
EXPECT_FP_EQ(
cx, FPBits::make_value(test5_1.get_explicit_mantissa(), 0).get_val());
TEST_SPECIAL(cx, test5_1_val, 1, FE_INVALID);
EXPECT_FP_EQ(cx, aNaN);

FPBits test5_2(UInt128(0x0000004270000001));
FPBits test5_2(0x00000000'00000230'00000042'70000001_u128);
const T test5_2_val = test5_2.get_val();
TEST_SPECIAL(cx, test5_2_val, 0, 0);
EXPECT_FP_EQ(
cx, FPBits::make_value(test5_2.get_explicit_mantissa(), 0).get_val());
TEST_SPECIAL(cx, test5_2_val, 1, FE_INVALID);
EXPECT_FP_EQ(cx, aNaN);

FPBits test5_3(UInt128(0x0000000008261001));
FPBits test5_3(0x00000000'00000560'00000000'08261001_u128);
const T test5_3_val = test5_3.get_val();
TEST_SPECIAL(cx, test5_3_val, 0, 0);
EXPECT_FP_EQ(
cx, FPBits::make_value(test5_3.get_explicit_mantissa(), 0).get_val());
TEST_SPECIAL(cx, test5_3_val, 1, FE_INVALID);
EXPECT_FP_EQ(cx, aNaN);

FPBits test5_4(UInt128(0x0000002816000000));
FPBits test5_4(0x00000000'00000780'00000028'16000000_u128);
const T test5_4_val = test5_4.get_val();
TEST_SPECIAL(cx, test5_4_val, 0, 0);
EXPECT_FP_EQ(
cx, FPBits::make_value(test5_4.get_explicit_mantissa(), 0).get_val());
TEST_SPECIAL(cx, test5_4_val, 1, FE_INVALID);
EXPECT_FP_EQ(cx, aNaN);

FPBits test5_5(UInt128(0x0000004270000001));
FPBits test5_5(0x00000000'00000900'00000042'70000001_u128);
const T test5_5_val = test5_5.get_val();
TEST_SPECIAL(cx, test5_5_val, 0, 0);
EXPECT_FP_EQ(
cx, FPBits::make_value(test5_5.get_explicit_mantissa(), 0).get_val());
TEST_SPECIAL(cx, test5_5_val, 1, FE_INVALID);
EXPECT_FP_EQ(cx, aNaN);

FPBits test5_6(UInt128(0x0000000008261001));
FPBits test5_6(0x00000000'00000AB0'00000000'08261001_u128);
const T test5_6_val = test5_6.get_val();
TEST_SPECIAL(cx, test5_6_val, 0, 0);
EXPECT_FP_EQ(
cx, FPBits::make_value(test5_6.get_explicit_mantissa(), 0).get_val());
TEST_SPECIAL(cx, test5_6_val, 1, FE_INVALID);
EXPECT_FP_EQ(cx, aNaN);
}
}

Expand Down