44 lines
1.6 KiB
JavaScript
44 lines
1.6 KiB
JavaScript
function firstCareAboutZeroSecondDoesNot(a) {
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var resultA = Math.round(a);
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var resultB = Math.round(a)|0;
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return { resultA:resultA, resultB:resultB };
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}
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noInline(firstCareAboutZeroSecondDoesNot);
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function firstDoNotCareAboutZeroSecondDoes(a) {
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var resultA = Math.round(a)|0;
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var resultB = Math.round(a);
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return { resultA:resultA, resultB:resultB };
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}
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noInline(firstDoNotCareAboutZeroSecondDoes);
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// Warmup with doubles, but nothing that would round to -0 to ensure we never
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// see a double as result. The result must be integers, the input is kept to small values.
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function warmup() {
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for (var i = 0; i < 1e4; ++i) {
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firstCareAboutZeroSecondDoesNot(42.6 + i);
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firstDoNotCareAboutZeroSecondDoes(42.4 + i);
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}
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}
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warmup();
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function verifyNegativeZeroIsPreserved() {
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for (var i = 0; i < 1e4; ++i) {
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var result1 = firstCareAboutZeroSecondDoesNot(-0.1);
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if (1 / result1.resultA !== -Infinity) {
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throw "Failed firstCareAboutZeroSecondDoesNot(-0.1), resultA = " + result1.resultA;
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}
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if (1 / result1.resultB !== Infinity) {
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throw "Failed firstCareAboutZeroSecondDoesNot(-0.1), resultB = " + result1.resultB;
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}
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var result2 = firstDoNotCareAboutZeroSecondDoes(-0.1);
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if (1 / result2.resultA !== Infinity) {
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throw "Failed firstDoNotCareAboutZeroSecondDoes(-0.1), resultA = " + result1.resultA;
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}
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if (1 / result2.resultB !== -Infinity) {
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throw "Failed firstDoNotCareAboutZeroSecondDoes(-0.1), resultB = " + result1.resultB;
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}
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}
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}
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verifyNegativeZeroIsPreserved(); |