150403 2015-10-21 11:42:44 -0700 JSC Math.pow tests makes wrong assumptions on precision 2015-10-22 11:30:51 -0700 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build Unspecified Unspecified RESOLVED INVALID P2 Normal --- 108664 1 guijemont webkit-unassigned fpizlo oldest_to_newest 1135311 0 guijemont 2015-10-21 11:42:44 -0700 The test in Source/JavaScriptCore/tests/stress/math-pow-with-constants.js assumes the results of Math.pow() calls would be of a given precision, even though the spec[1] says that Math.pow(): Returns an implementation-dependent approximation to the result of raising x to the power y. At least on MIPS, the precision of the result is different on some tests. [1] http://www.ecma-international.org/ecma-262/6.0/#sec-math.pow 1135317 1 263708 guijemont 2015-10-21 11:50:20 -0700 Created attachment 263708 Patch 1135435 2 263752 guijemont 2015-10-21 15:43:54 -0700 Created attachment 263752 Patch New version with typo corrected 1135546 3 263752 fpizlo 2015-10-21 19:47:31 -0700 Comment on attachment 263752 Patch Sounds like a mips bug. Jsc aims to have strong precision guarantees. 1135752 4 guijemont 2015-10-22 11:30:51 -0700 After further checking, it seems like the issue that I encountered with that test only happens when using uclibc. In that case, Math.pow(2,42.5) returns 6219777023950.949. Though that number looks like it has more precision, it turns out[1] that it seems that it is not rounded properly, but rather truncated (the correct rounding to 3 digits would be 6219777023950.950), so it seems like it is a uclibc issue. Sorry for the noise. [1] http://www.wolframalpha.com/input/?i=2%5E42.5 263708 2015-10-21 11:50:20 -0700 2015-10-21 15:43:49 -0700 Patch bug-150403-20151021134948.patch text/plain 2660 guijemont U3VidmVyc2lvbiBSZXZpc2lvbjogMTkxMzkxCmRpZmYgLS1naXQgYS9Tb3VyY2UvSmF2YVNjcmlw dENvcmUvQ2hhbmdlTG9nIGIvU291cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwppbmRleCA4 NDU1MzcxMmMzMzllYjc0YjU0YTM0NTQ0NDBiYmI4M2EwNjFlNTkwLi5hOGQ3NmEzYTFmZTgzODk3 ODc1YjkyYmExYTE2YjU5YjUxM2YxNDFkIDEwMDY0NAotLS0gYS9Tb3VyY2UvSmF2YVNjcmlwdENv cmUvQ2hhbmdlTG9nCisrKyBiL1NvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKQEAgLTEs NSArMSwyMyBAQAogMjAxNS0xMC0yMSAgR3VpbGxhdW1lIEVtb250ICA8Z3VpamVtb250QGlnYWxp YS5jb20+CiAKKyAgICAgICAgSlNDIE1hdGgucG93IHRlc3RzIG1ha2VzIGFzc3VtcHRpb25zIG9u IHByZWNpc2lvbgorICAgICAgICBodHRwczovL2J1Z3Mud2Via2l0Lm9yZy9zaG93X2J1Zy5jZ2k/ aWQ9MTUwNDAzCisKKyAgICAgICAgVGhlIHNwZWNbMV0gc2F5cyB0aGF0IE1hdGgucG93OgorICAg ICAgICBSZXR1cm5zIGFuIGltcGxlbWVudGF0aW9uLWRlcGVuZGVudCBhcHByb3hpbWF0aW9uIHRv 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