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#include "flang/Decimal/decimal.h"
#include "llvm/Support/raw_ostream.h"
#include <cinttypes>
#include <cstdio>
#include <cstring>
using namespace Fortran::decimal;
static int tests{0};
static int fails{0};
union u {
float x;
std::uint32_t u;
};
llvm::raw_ostream &failed(float x) {
++fails;
union u u;
u.x = x;
llvm::outs() << "FAIL: 0x";
return llvm::outs().write_hex(u.u);
}
void testDirect(float x, const char *expect, int expectExpo, int flags = 0) {
char buffer[1024];
++tests;
auto result{ConvertFloatToDecimal(buffer, sizeof buffer,
static_cast<enum DecimalConversionFlags>(flags), 1024, RoundNearest, x)};
if (result.str == nullptr) {
failed(x) << ' ' << flags << ": no result str\n";
} else if (std::strcmp(result.str, expect) != 0 ||
result.decimalExponent != expectExpo) {
failed(x) << ' ' << flags << ": expect '." << expect << 'e' << expectExpo
<< "', got '." << result.str << 'e' << result.decimalExponent
<< "'\n";
}
}
void testReadback(float x, int flags) {
char buffer[1024];
++tests;
auto result{ConvertFloatToDecimal(buffer, sizeof buffer,
static_cast<enum DecimalConversionFlags>(flags), 1024, RoundNearest, x)};
if (result.str == nullptr) {
failed(x) << ' ' << flags << ": no result str\n";
} else {
float y{0};
char *q{const_cast<char *>(result.str)};
int expo{result.decimalExponent};
expo -= result.length;
if (*q == '-' || *q == '+') {
++expo;
}
if (q >= buffer && q < buffer + sizeof buffer) {
std::snprintf(q + result.length,
buffer + sizeof buffer - (q + result.length), "e%d", expo);
}
const char *p{q};
auto rflags{ConvertDecimalToFloat(&p, &y, RoundNearest)};
union u u;
if (!(x == x)) {
if (y == y || *p != '\0' || (rflags & Invalid)) {
u.x = y;
(failed(x) << " (NaN) " << flags << ": -> '" << result.str << "' -> 0x")
.write_hex(u.u)
<< " '" << p << "' " << rflags << '\n';
}
} else if (x != y || *p != '\0' || (rflags & Invalid)) {
u.x = x;
(failed(x) << ' ' << flags << ": -> '" << result.str << "' -> 0x")
.write_hex(u.u)
<< " '" << p << "' " << rflags << '\n';
}
}
}
int main() {
union u u;
testDirect(-1.0, "-1", 1);
testDirect(0.0, "0", 0);
testDirect(0.0, "+0", 0, AlwaysSign);
testDirect(1.0, "1", 1);
testDirect(2.0, "2", 1);
testDirect(-1.0, "-1", 1);
testDirect(314159, "314159", 6);
testDirect(0.0625, "625", -1);
u.u = 0x80000000;
testDirect(u.x, "-0", 0);
u.u = 0x7f800000;
testDirect(u.x, "Inf", 0);
testDirect(u.x, "+Inf", 0, AlwaysSign);
u.u = 0xff800000;
testDirect(u.x, "-Inf", 0);
u.u = 0xffffffff;
testDirect(u.x, "NaN", 0);
testDirect(u.x, "NaN", 0, AlwaysSign);
u.u = 1;
testDirect(u.x,
"140129846432481707092372958328991613128026194187651577175706828388979108"
"268586060148663818836212158203125",
-44, 0);
testDirect(u.x, "1", -44, Minimize);
u.u = 0x7f777777;
testDirect(u.x, "3289396118917826996438159226753253376", 39, 0);
testDirect(u.x, "32893961", 39, Minimize);
for (u.u = 0; u.u < 16; ++u.u) {
testReadback(u.x, 0);
testReadback(-u.x, 0);
testReadback(u.x, Minimize);
testReadback(-u.x, Minimize);
}
for (u.u = 1; u.u < 0x7f800000; u.u *= 2) {
testReadback(u.x, 0);
testReadback(-u.x, 0);
testReadback(u.x, Minimize);
testReadback(-u.x, Minimize);
}
for (u.u = 0x7f7ffff0; u.u < 0x7f800010; ++u.u) {
testReadback(u.x, 0);
testReadback(-u.x, 0);
testReadback(u.x, Minimize);
testReadback(-u.x, Minimize);
}
for (u.u = 0; u.u < 0x7f800000; u.u += 65536) {
testReadback(u.x, 0);
testReadback(-u.x, 0);
testReadback(u.x, Minimize);
testReadback(-u.x, Minimize);
}
for (u.u = 0; u.u < 0x7f800000; u.u += 99999) {
testReadback(u.x, 0);
testReadback(-u.x, 0);
testReadback(u.x, Minimize);
testReadback(-u.x, Minimize);
}
for (u.u = 0; u.u < 0x7f800000; u.u += 32767) {
testReadback(u.x, 0);
testReadback(-u.x, 0);
testReadback(u.x, Minimize);
testReadback(-u.x, Minimize);
}
llvm::outs() << tests << " tests run, " << fails << " tests failed\n";
return fails > 0;
}
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