forked from OSchip/llvm-project
89 lines
2.3 KiB
C++
89 lines
2.3 KiB
C++
#include "flang/Decimal/decimal.h"
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#include "llvm/Support/raw_ostream.h"
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#include <cinttypes>
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#include <cstdio>
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#include <cstring>
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static constexpr int incr{1}; // steps through all values
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static constexpr bool doNegative{true};
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static constexpr bool doMinimize{true};
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using namespace Fortran::decimal;
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static std::uint64_t tests{0};
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static std::uint64_t fails{0};
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union u {
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float x;
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std::uint32_t u;
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};
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llvm::raw_ostream &failed(float x) {
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++fails;
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union u u;
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u.x = x;
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llvm::outs() << "FAIL: 0x";
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return llvm::outs().write_hex(u.u);
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}
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void testReadback(float x, int flags) {
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char buffer[1024];
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union u u;
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u.x = x;
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if (!(tests & 0x3fffff)) {
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llvm::errs() << "\n0x";
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llvm::errs().write_hex(u.u) << ' ';
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} else if (!(tests & 0xffff)) {
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llvm::errs() << '.';
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}
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++tests;
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auto result{ConvertFloatToDecimal(buffer, sizeof buffer,
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static_cast<enum DecimalConversionFlags>(flags), 1024, RoundNearest, x)};
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if (result.str == nullptr) {
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failed(x) << ' ' << flags << ": no result str\n";
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} else {
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float y{0};
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char *q{const_cast<char *>(result.str)};
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if ((*q >= '0' && *q <= '9') ||
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((*q == '-' || *q == '+') && q[1] >= '0' && q[1] <= '9')) {
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int expo{result.decimalExponent};
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expo -= result.length;
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if (*q == '-' || *q == '+') {
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++expo;
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}
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std::sprintf(q + result.length, "e%d", expo);
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}
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const char *p{q};
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auto rflags{ConvertDecimalToFloat(&p, &y, RoundNearest)};
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if (!(x == x)) {
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if (y == y || *p != '\0' || (rflags & Invalid)) {
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u.x = y;
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failed(x) << " (NaN) " << flags << ": -> '" << result.str << "' -> 0x";
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failed(x).write_hex(u.u) << " '" << p << "' " << rflags << '\n';
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}
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} else if (x != y || *p != '\0' || (rflags & Invalid)) {
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u.x = y;
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failed(x) << ' ' << flags << ": -> '" << result.str << "' -> 0x";
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failed(x).write_hex(u.u) << " '" << p << "' " << rflags << '\n';
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}
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}
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}
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int main() {
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union u u;
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for (u.u = 0; u.u < 0x7f800010; u.u += incr) {
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testReadback(u.x, 0);
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if constexpr (doNegative) {
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testReadback(-u.x, 0);
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}
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if constexpr (doMinimize) {
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testReadback(u.x, Minimize);
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if constexpr (doNegative) {
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testReadback(-u.x, Minimize);
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}
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}
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}
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llvm::outs() << '\n' << tests << " tests run, " << fails << " tests failed\n";
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return fails > 0;
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}
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