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feat(big): add 64-bit-centric ops

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fallenoak 2023-01-23 22:10:24 -06:00 • committed by GitHub
parent 23fb94c19d
commit d3fd03d67e
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4 changed files with 105 additions and 0 deletions
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1
storm/CMakeLists.txt
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@ -3,6 +3,7 @@ check_cxx_compiler_flag(-Wno-invalid-offsetof HAS_NO_INVALID_OFFSETOF)
file(GLOB STORM_SOURCES
"*.cpp"
"big/*.cpp"
"hash/*.cpp"
"queue/*.cpp"
"string/*.cpp"

24
storm/big/Ops.cpp Normal file
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@ -0,0 +1,24 @@
#include "storm/big/Ops.hpp"
uint32_t ExtractLowPart(uint64_t& value) {
auto low = static_cast<uint32_t>(value);
value >>= 32;
return low;
}
uint32_t ExtractLowPartSx(uint64_t& value) {
auto low = static_cast<uint32_t>(value);
value >>= 32;
if (value >= 0x80000000) {
reinterpret_cast<uint32_t*>(&value)[0] = value;
reinterpret_cast<uint32_t*>(&value)[1] = -1;
}
return low;
}
uint64_t MakeLarge(uint32_t low, uint32_t high) {
return low + (static_cast<uint64_t>(high) << 32);
}

12
storm/big/Ops.hpp Normal file
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@ -0,0 +1,12 @@
#ifndef STORM_BIG_OPS_HPP
#define STORM_BIG_OPS_HPP
#include <cstdint>
uint32_t ExtractLowPart(uint64_t& value);
uint32_t ExtractLowPartSx(uint64_t& value);
uint64_t MakeLarge(uint32_t low, uint32_t high);
#endif

68
test/Big.cpp Normal file
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@ -0,0 +1,68 @@
#include "storm/big/Ops.hpp"
#include "test/Test.hpp"
TEST_CASE("ExtractLowPart", "[big]") {
SECTION("extracts low part of 0") {
uint64_t value = 0;
auto low = ExtractLowPart(value);
REQUIRE(low == 0);
REQUIRE(value == 0);
}
SECTION("extracts low part of 0x12345678") {
uint64_t value = 0x12345678;
auto low = ExtractLowPart(value);
REQUIRE(low == 0x12345678);
REQUIRE(value == 0);
}
SECTION("extracts low part of 0xAAAABBBBCCCCDDDD") {
uint64_t value = 0xAAAABBBBCCCCDDDD;
auto low = ExtractLowPart(value);
REQUIRE(low == 0xCCCCDDDD);
REQUIRE(value == 0xAAAABBBB);
}
}
TEST_CASE("ExtractLowPartSx", "[big]") {
SECTION("extracts low part of 0") {
uint64_t value = 0;
auto low = ExtractLowPartSx(value);
REQUIRE(low == 0);
REQUIRE(value == 0);
}
SECTION("extracts low part of 0x12345678") {
uint64_t value = 0x12345678;
auto low = ExtractLowPartSx(value);
REQUIRE(low == 0x12345678);
REQUIRE(value == 0);
}
SECTION("extracts low part of 0xAAAABBBBCCCCDDDD") {
uint64_t value = 0xAAAABBBBCCCCDDDD;
auto low = ExtractLowPartSx(value);
REQUIRE(low == 0xCCCCDDDD);
REQUIRE(value == 0xFFFFFFFFAAAABBBB);
}
}
TEST_CASE("MakeLarge", "[big]") {
SECTION("creates uint64_t out of 0xAABBCCDD and 0x11223344") {
uint64_t value = MakeLarge(0xAABBCCDD, 0x11223344);
REQUIRE(value == 0x11223344AABBCCDD);
}
SECTION("creates uint64_t out of 0 and 0x11223344") {
uint64_t value = MakeLarge(0x00000000, 0x11223344);
REQUIRE(value == 0x1122334400000000);
}
}