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Test with high path complexity.

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chriseth 2018-05-04 17:46:47 +02:00
parent fba7e055d9
commit bbae4fb0ef
1 changed files with 40 additions and 0 deletions
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test/libsolidity/GasMeter.cpp
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@ -307,6 +307,46 @@ BOOST_AUTO_TEST_CASE(regular_functions_exclude_fallback)
testCreationTimeGas(sourceCode);
testRunTimeGas("x()", vector<bytes>{encodeArgs()});
}
BOOST_AUTO_TEST_CASE(complex_control_flow)
{
// This crashed the gas estimator previously (or took a very long time).
// Now we do not follow branches if they start out with lower gas costs than the ones
// we previously considered. This of course reduces accuracy.
char const* sourceCode = R"(
contract log {
function ln(int128 x) constant returns (int128 result) {
int128 t = x / 256;
int128 y = 5545177;
x = t;
t = x * 16; if (t <= 1000000) { x = t; y = y - 2772588; }
t = x * 4; if (t <= 1000000) { x = t; y = y - 1386294; }
t = x * 2; if (t <= 1000000) { x = t; y = y - 693147; }
t = x + x / 2; if (t <= 1000000) { x = t; y = y - 405465; }
t = x + x / 4; if (t <= 1000000) { x = t; y = y - 223144; }
t = x + x / 8; if (t <= 1000000) { x = t; y = y - 117783; }
t = x + x / 16; if (t <= 1000000) { x = t; y = y - 60624; }
t = x + x / 32; if (t <= 1000000) { x = t; y = y - 30771; }
t = x + x / 64; if (t <= 1000000) { x = t; y = y - 15504; }
t = x + x / 128; if (t <= 1000000) { x = t; y = y - 7782; }
t = x + x / 256; if (t <= 1000000) { x = t; y = y - 3898; }
t = x + x / 512; if (t <= 1000000) { x = t; y = y - 1951; }
t = x + x / 1024; if (t <= 1000000) { x = t; y = y - 976; }
t = x + x / 2048; if (t <= 1000000) { x = t; y = y - 488; }
t = x + x / 4096; if (t <= 1000000) { x = t; y = y - 244; }
t = x + x / 8192; if (t <= 1000000) { x = t; y = y - 122; }
t = x + x / 16384; if (t <= 1000000) { x = t; y = y - 61; }
t = x + x / 32768; if (t <= 1000000) { x = t; y = y - 31; }
t = x + x / 65536; if (t <= 1000000) { y = y - 15; }
return y;
}
}
)";
testCreationTimeGas(sourceCode);
// max gas is used for small x
testRunTimeGas("ln(int128)", vector<bytes>{encodeArgs(0), encodeArgs(10), encodeArgs(105), encodeArgs(30000)});
}
BOOST_AUTO_TEST_SUITE_END()
}