[libc-commits] [libc] c103d57 - [libc] Fix forward missing `BigInt` specialization of `mask_leading_ones` / `mask_trailing_ones` (#84325)
via libc-commits
libc-commits at lists.llvm.org
Thu Mar 7 11:00:08 PST 2024
Author: Guillaume Chatelet
Date: 2024-03-07T20:00:05+01:00
New Revision: c103d573e7fc236c0c9e2fde41a843ea62d960f4
URL: https://github.com/llvm/llvm-project/commit/c103d573e7fc236c0c9e2fde41a843ea62d960f4
DIFF: https://github.com/llvm/llvm-project/commit/c103d573e7fc236c0c9e2fde41a843ea62d960f4.diff
LOG: [libc] Fix forward missing `BigInt` specialization of `mask_leading_ones` / `mask_trailing_ones` (#84325)
#84299 broke the arm32 build, this patch fixes it forward.
Added:
Modified:
libc/src/__support/UInt.h
libc/src/__support/math_extras.h
libc/src/stdio/printf_core/float_dec_converter.h
libc/test/UnitTest/CMakeLists.txt
libc/test/UnitTest/StringUtils.h
libc/test/src/__support/CMakeLists.txt
libc/test/src/__support/math_extras_test.cpp
utils/bazel/llvm-project-overlay/libc/test/src/__support/BUILD.bazel
Removed:
################################################################################
diff --git a/libc/src/__support/UInt.h b/libc/src/__support/UInt.h
index b3d8f00b9a01a5..925de8764715da 100644
--- a/libc/src/__support/UInt.h
+++ b/libc/src/__support/UInt.h
@@ -1056,4 +1056,60 @@ rotr(T value, int rotate) {
} // namespace LIBC_NAMESPACE::cpp
+namespace LIBC_NAMESPACE {
+
+// Specialization of mask_trailing_ones ('math_extras.h') for BigInt.
+template <typename T, size_t count>
+LIBC_INLINE constexpr cpp::enable_if_t<cpp::is_big_int_v<T>, T>
+mask_trailing_ones() {
+ static_assert(!T::SIGNED);
+ if (count == 0)
+ return T();
+ constexpr unsigned T_BITS = CHAR_BIT * sizeof(T);
+ static_assert(count <= T_BITS && "Invalid bit index");
+ using word_type = typename T::word_type;
+ T out;
+ constexpr int CHUNK_INDEX_CONTAINING_BIT =
+ static_cast<int>(count / T::WORD_SIZE);
+ int index = 0;
+ for (auto &word : out.val) {
+ if (index < CHUNK_INDEX_CONTAINING_BIT)
+ word = -1;
+ else if (index > CHUNK_INDEX_CONTAINING_BIT)
+ word = 0;
+ else
+ word = mask_trailing_ones<word_type, count % T::WORD_SIZE>();
+ ++index;
+ }
+ return out;
+}
+
+// Specialization of mask_leading_ones ('math_extras.h') for BigInt.
+template <typename T, size_t count>
+LIBC_INLINE constexpr cpp::enable_if_t<cpp::is_big_int_v<T>, T>
+mask_leading_ones() {
+ static_assert(!T::SIGNED);
+ if (count == 0)
+ return T();
+ constexpr unsigned T_BITS = CHAR_BIT * sizeof(T);
+ static_assert(count <= T_BITS && "Invalid bit index");
+ using word_type = typename T::word_type;
+ T out;
+ constexpr int CHUNK_INDEX_CONTAINING_BIT =
+ static_cast<int>((T::BITS - count - 1ULL) / T::WORD_SIZE);
+ int index = 0;
+ for (auto &word : out.val) {
+ if (index < CHUNK_INDEX_CONTAINING_BIT)
+ word = 0;
+ else if (index > CHUNK_INDEX_CONTAINING_BIT)
+ word = -1;
+ else
+ word = mask_leading_ones<word_type, count % T::WORD_SIZE>();
+ ++index;
+ }
+ return out;
+}
+
+} // namespace LIBC_NAMESPACE
+
#endif // LLVM_LIBC_SRC___SUPPORT_UINT_H
diff --git a/libc/src/__support/math_extras.h b/libc/src/__support/math_extras.h
index 7a89fbb11b2a9e..c6b458ddecdabf 100644
--- a/libc/src/__support/math_extras.h
+++ b/libc/src/__support/math_extras.h
@@ -20,21 +20,18 @@ namespace LIBC_NAMESPACE {
// Create a bitmask with the count right-most bits set to 1, and all other bits
// set to 0. Only unsigned types are allowed.
template <typename T, size_t count>
-LIBC_INLINE constexpr T mask_trailing_ones() {
- static_assert(cpp::is_unsigned_v<T>);
+LIBC_INLINE constexpr cpp::enable_if_t<cpp::is_unsigned_v<T>, T>
+mask_trailing_ones() {
constexpr unsigned T_BITS = CHAR_BIT * sizeof(T);
static_assert(count <= T_BITS && "Invalid bit index");
- // It's important not to initialize T with -1, since T may be BigInt which
- // will take -1 as a uint64_t and only initialize the low 64 bits.
- constexpr T ALL_ZEROES(0);
- constexpr T ALL_ONES(~ALL_ZEROES); // bitwise NOT performs integer promotion.
- return count == 0 ? 0 : (ALL_ONES >> (T_BITS - count));
+ return count == 0 ? 0 : (T(-1) >> (T_BITS - count));
}
// Create a bitmask with the count left-most bits set to 1, and all other bits
// set to 0. Only unsigned types are allowed.
template <typename T, size_t count>
-LIBC_INLINE constexpr T mask_leading_ones() {
+LIBC_INLINE constexpr cpp::enable_if_t<cpp::is_unsigned_v<T>, T>
+mask_leading_ones() {
constexpr T MASK(mask_trailing_ones<T, CHAR_BIT * sizeof(T) - count>());
return T(~MASK); // bitwise NOT performs integer promotion.
}
diff --git a/libc/src/stdio/printf_core/float_dec_converter.h b/libc/src/stdio/printf_core/float_dec_converter.h
index a6c68329e66023..27d229a3e42cb5 100644
--- a/libc/src/stdio/printf_core/float_dec_converter.h
+++ b/libc/src/stdio/printf_core/float_dec_converter.h
@@ -12,6 +12,7 @@
#include "src/__support/CPP/string_view.h"
#include "src/__support/FPUtil/FPBits.h"
#include "src/__support/FPUtil/rounding_mode.h"
+#include "src/__support/UInt.h" // cpp::is_big_int_v
#include "src/__support/float_to_string.h"
#include "src/__support/integer_to_string.h"
#include "src/__support/libc_assert.h"
@@ -33,7 +34,8 @@ using ExponentString =
// Returns true if value is divisible by 2^p.
template <typename T>
-LIBC_INLINE constexpr cpp::enable_if_t<cpp::is_integral_v<T>, bool>
+LIBC_INLINE constexpr cpp::enable_if_t<
+ cpp::is_integral_v<T> || cpp::is_big_int_v<T>, bool>
multiple_of_power_of_2(T value, uint32_t p) {
return (value & ((T(1) << p) - 1)) == 0;
}
@@ -76,7 +78,8 @@ LIBC_INLINE RoundDirection get_round_direction(int last_digit, bool truncated,
}
template <typename T>
-LIBC_INLINE constexpr cpp::enable_if_t<cpp::is_integral_v<T>, bool>
+LIBC_INLINE constexpr cpp::enable_if_t<
+ cpp::is_integral_v<T> || cpp::is_big_int_v<T>, bool>
zero_after_digits(int32_t base_2_exp, int32_t digits_after_point, T mantissa,
const int32_t mant_width) {
const int32_t required_twos = -base_2_exp - digits_after_point - 1;
diff --git a/libc/test/UnitTest/CMakeLists.txt b/libc/test/UnitTest/CMakeLists.txt
index 36837c553efce1..8a35f1204eb511 100644
--- a/libc/test/UnitTest/CMakeLists.txt
+++ b/libc/test/UnitTest/CMakeLists.txt
@@ -104,6 +104,7 @@ add_header_library(
DEPENDS
libc.src.__support.CPP.string
libc.src.__support.CPP.type_traits
+ libc.src.__support.uint
)
add_unittest_framework_library(
diff --git a/libc/test/UnitTest/StringUtils.h b/libc/test/UnitTest/StringUtils.h
index 54cff97ceafb4e..1e3ba5715d23d6 100644
--- a/libc/test/UnitTest/StringUtils.h
+++ b/libc/test/UnitTest/StringUtils.h
@@ -11,12 +11,13 @@
#include "src/__support/CPP/string.h"
#include "src/__support/CPP/type_traits.h"
+#include "src/__support/UInt.h"
namespace LIBC_NAMESPACE {
// Return the first N hex digits of an integer as a string in upper case.
template <typename T>
-cpp::enable_if_t<cpp::is_integral_v<T>, cpp::string>
+cpp::enable_if_t<cpp::is_integral_v<T> || cpp::is_big_int_v<T>, cpp::string>
int_to_hex(T value, size_t length = sizeof(T) * 2) {
cpp::string s(length, '0');
diff --git a/libc/test/src/__support/CMakeLists.txt b/libc/test/src/__support/CMakeLists.txt
index 8c861b576f9b1b..adbacb9728ccd4 100644
--- a/libc/test/src/__support/CMakeLists.txt
+++ b/libc/test/src/__support/CMakeLists.txt
@@ -27,7 +27,9 @@ add_libc_test(
SRCS
math_extras_test.cpp
DEPENDS
+ libc.src.__support.integer_literals
libc.src.__support.math_extras
+ libc.src.__support.uint128
)
add_libc_test(
diff --git a/libc/test/src/__support/math_extras_test.cpp b/libc/test/src/__support/math_extras_test.cpp
index e55d995592cc1c..ed064363d446bb 100644
--- a/libc/test/src/__support/math_extras_test.cpp
+++ b/libc/test/src/__support/math_extras_test.cpp
@@ -6,34 +6,59 @@
//
//===----------------------------------------------------------------------===//
+#include "src/__support/UInt128.h" // UInt128
+#include "src/__support/integer_literals.h"
#include "src/__support/math_extras.h"
#include "test/UnitTest/Test.h"
namespace LIBC_NAMESPACE {
TEST(LlvmLibcBlockMathExtrasTest, mask_trailing_ones) {
- EXPECT_EQ(uint8_t(0), (mask_leading_ones<uint8_t, 0>()));
- EXPECT_EQ(uint8_t(0), (mask_trailing_ones<uint8_t, 0>()));
- EXPECT_EQ(uint16_t(0), (mask_leading_ones<uint16_t, 0>()));
- EXPECT_EQ(uint16_t(0), (mask_trailing_ones<uint16_t, 0>()));
- EXPECT_EQ(uint32_t(0), (mask_leading_ones<uint32_t, 0>()));
- EXPECT_EQ(uint32_t(0), (mask_trailing_ones<uint32_t, 0>()));
- EXPECT_EQ(uint64_t(0), (mask_leading_ones<uint64_t, 0>()));
- EXPECT_EQ(uint64_t(0), (mask_trailing_ones<uint64_t, 0>()));
-
- EXPECT_EQ(uint32_t(0x00000003), (mask_trailing_ones<uint32_t, 2>()));
- EXPECT_EQ(uint32_t(0xC0000000), (mask_leading_ones<uint32_t, 2>()));
-
- EXPECT_EQ(uint32_t(0x000007FF), (mask_trailing_ones<uint32_t, 11>()));
- EXPECT_EQ(uint32_t(0xFFE00000), (mask_leading_ones<uint32_t, 11>()));
-
- EXPECT_EQ(uint32_t(0xFFFFFFFF), (mask_trailing_ones<uint32_t, 32>()));
- EXPECT_EQ(uint32_t(0xFFFFFFFF), (mask_leading_ones<uint32_t, 32>()));
- EXPECT_EQ(uint64_t(0xFFFFFFFFFFFFFFFF), (mask_trailing_ones<uint64_t, 64>()));
- EXPECT_EQ(uint64_t(0xFFFFFFFFFFFFFFFF), (mask_leading_ones<uint64_t, 64>()));
-
- EXPECT_EQ(uint64_t(0x0000FFFFFFFFFFFF), (mask_trailing_ones<uint64_t, 48>()));
- EXPECT_EQ(uint64_t(0xFFFFFFFFFFFF0000), (mask_leading_ones<uint64_t, 48>()));
+ EXPECT_EQ(0_u8, (mask_leading_ones<uint8_t, 0>()));
+ EXPECT_EQ(0_u8, (mask_trailing_ones<uint8_t, 0>()));
+ EXPECT_EQ(0_u16, (mask_leading_ones<uint16_t, 0>()));
+ EXPECT_EQ(0_u16, (mask_trailing_ones<uint16_t, 0>()));
+ EXPECT_EQ(0_u32, (mask_leading_ones<uint32_t, 0>()));
+ EXPECT_EQ(0_u32, (mask_trailing_ones<uint32_t, 0>()));
+ EXPECT_EQ(0_u64, (mask_leading_ones<uint64_t, 0>()));
+ EXPECT_EQ(0_u64, (mask_trailing_ones<uint64_t, 0>()));
+
+ EXPECT_EQ(0x00000003_u32, (mask_trailing_ones<uint32_t, 2>()));
+ EXPECT_EQ(0xC0000000_u32, (mask_leading_ones<uint32_t, 2>()));
+
+ EXPECT_EQ(0x000007FF_u32, (mask_trailing_ones<uint32_t, 11>()));
+ EXPECT_EQ(0xFFE00000_u32, (mask_leading_ones<uint32_t, 11>()));
+
+ EXPECT_EQ(0xFFFFFFFF_u32, (mask_trailing_ones<uint32_t, 32>()));
+ EXPECT_EQ(0xFFFFFFFF_u32, (mask_leading_ones<uint32_t, 32>()));
+ EXPECT_EQ(0xFFFFFFFFFFFFFFFF_u64, (mask_trailing_ones<uint64_t, 64>()));
+ EXPECT_EQ(0xFFFFFFFFFFFFFFFF_u64, (mask_leading_ones<uint64_t, 64>()));
+
+ EXPECT_EQ(0x0000FFFFFFFFFFFF_u64, (mask_trailing_ones<uint64_t, 48>()));
+ EXPECT_EQ(0xFFFFFFFFFFFF0000_u64, (mask_leading_ones<uint64_t, 48>()));
+
+ EXPECT_EQ(0_u128, (mask_trailing_ones<UInt128, 0>()));
+ EXPECT_EQ(0_u128, (mask_leading_ones<UInt128, 0>()));
+
+ EXPECT_EQ(0x00000000000000007FFFFFFFFFFFFFFF_u128,
+ (mask_trailing_ones<UInt128, 63>()));
+ EXPECT_EQ(0xFFFFFFFFFFFFFFFE0000000000000000_u128,
+ (mask_leading_ones<UInt128, 63>()));
+
+ EXPECT_EQ(0x0000000000000000FFFFFFFFFFFFFFFF_u128,
+ (mask_trailing_ones<UInt128, 64>()));
+ EXPECT_EQ(0xFFFFFFFFFFFFFFFF0000000000000000_u128,
+ (mask_leading_ones<UInt128, 64>()));
+
+ EXPECT_EQ(0x0000000000000001FFFFFFFFFFFFFFFF_u128,
+ (mask_trailing_ones<UInt128, 65>()));
+ EXPECT_EQ(0xFFFFFFFFFFFFFFFF8000000000000000_u128,
+ (mask_leading_ones<UInt128, 65>()));
+
+ EXPECT_EQ(0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF_u128,
+ (mask_trailing_ones<UInt128, 128>()));
+ EXPECT_EQ(0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF_u128,
+ (mask_leading_ones<UInt128, 128>()));
}
} // namespace LIBC_NAMESPACE
diff --git a/utils/bazel/llvm-project-overlay/libc/test/src/__support/BUILD.bazel b/utils/bazel/llvm-project-overlay/libc/test/src/__support/BUILD.bazel
index 8e94a84f586f4c..19d4c7869799a0 100644
--- a/utils/bazel/llvm-project-overlay/libc/test/src/__support/BUILD.bazel
+++ b/utils/bazel/llvm-project-overlay/libc/test/src/__support/BUILD.bazel
@@ -13,7 +13,11 @@ licenses(["notice"])
libc_test(
name = "math_extras_test",
srcs = ["math_extras_test.cpp"],
- deps = ["//libc:__support_math_extras"],
+ deps = [
+ "//libc:__support_integer_literals",
+ "//libc:__support_math_extras",
+ "//libc:__support_uint128",
+ ],
)
# This test is currently disabled because of an issue in
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