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fp_testsuite.cpp
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fp_testsuite.cpp
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#include <catch2/catch_test_macros.hpp>
#include <libriscv/machine.hpp>
extern std::vector<uint8_t> build_and_load(const std::string& code,
const std::string& args = "-O2 -static", bool cpp = false);
static const uint64_t MAX_MEMORY = 8ul << 20; /* 8MB */
static const uint64_t MAX_INSTRUCTIONS = 10'000'000ul;
static const std::string cwd {SRCDIR};
using namespace riscv;
TEST_CASE("Verify floating point instructions", "[Verification]")
{
const auto fpfuncfile = cwd + "/fptest/floating-point.cpp";
const auto binary = build_and_load(R"M(
#include "fptest/fptest.cpp"
)M", "-O2 -static -I" + cwd + " " + fpfuncfile, true);
riscv::Machine<RISCV64> machine { binary, { .memory_max = MAX_MEMORY } };
// We need to install Linux system calls for maximum gucciness
machine.setup_linux_syscalls();
// We need to create a Linux environment for runtimes to work well
machine.setup_linux(
{"compute_pi"},
{"LC_TYPE=C", "LC_ALL=C", "USER=root"});
// Run for at most X instructions before giving up
machine.simulate(MAX_INSTRUCTIONS);
REQUIRE(machine.return_value() == 0);
}
TEST_CASE("Compute PI slowly", "[Verification]")
{
const auto binary = build_and_load(R"M(
#include <assert.h>
#include <float.h>
inline int kinda64(float val, double expectation) {
return val >= expectation-FLT_EPSILON
&& val < expectation+FLT_EPSILON;
}
static struct {
double sum;
int counter;
int sign;
} pi;
static double compute_more_pi()
{
pi.sum += pi.sign / (2.0 * pi.counter + 1.0);
pi.counter ++;
pi.sign = -pi.sign;
return 4.0 * pi.sum;
}
int main() {
pi.sign = 1;
assert(kinda64(compute_more_pi(), 4.0));
assert(kinda64(compute_more_pi(), 2.66666666666));
assert(kinda64(compute_more_pi(), 3.46666666666));
})M");
riscv::Machine<RISCV64> machine { binary, { .memory_max = MAX_MEMORY } };
// We need to install Linux system calls for maximum gucciness
machine.setup_linux_syscalls();
// We need to create a Linux environment for runtimes to work well
machine.setup_linux(
{"compute_pi"},
{"LC_TYPE=C", "LC_ALL=C", "USER=root"});
// Run for at most X instructions before giving up
machine.simulate(MAX_INSTRUCTIONS);
REQUIRE(machine.return_value() == 0);
}