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Bug 892291: Correctly compute ranges for Math.imul; r=nbp

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--HG--
extra : rebase_source : 0b6d8d27bbb01fee911e90fc571f683e175fdbbc
This commit is contained in:
Benjamin Bouvier 2013-07-11 18:56:28 -07:00
parent 8f99de6740
commit 8f13d83d25
2 changed files with 14 additions and 0 deletions
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4
js/src/ion/RangeAnalysis.cpp
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@ -940,6 +940,10 @@ MMul::computeRange()
if (canBeNegativeZero())
canBeNegativeZero_ = Range::negativeZeroMul(&left, &right);
setRange(Range::mul(&left, &right));
// Truncated multiplications could overflow in both directions
if (isTruncated() && !range()->isInt32())
setRange(new Range(INT32_MIN, INT32_MAX));
}
void

10
js/src/jit-test/tests/asm.js/testBug892291.js Normal file
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@ -0,0 +1,10 @@
function a(stdlib) {
"use asm";
var imul = stdlib.Math.imul;
function f() {
return ((imul(-800, 0xf8ba1243)|0) % -1)|0;
}
return f;
}
var f = a(this);
assertEq(f(), 0);