------- Comment #11 from k-tsubota at ap dot jp dot nec dot com 2009-10-19 06:35 ------- I wonder if the bug is caused by errata of core2duo processor because the bug was only reproduced on core2duo and pentium D. (- not on UltraSPARC III)
Intel Core2duo processor has errata in its FPU - Errata AI20, AI38 (*1). And, the processor has workarounds of the errata. If these workaround was not implemented in the GCC version, the bug might be caused by these errata. And, Intel Celeron M processor also has similar errata - Errata W34, W56 (*2). --------------------------------------------------------- (*1) Core2duo processor Specification Update -> http://download.intel.com/design/processor/specupdt/313279.pdf -> Errata AI20,AI38 --------------------------------------------------------- (*2) Celeron M processor Specification Update -> http://download.intel.com/design/mobile/SPECUPDT/300303.pdf -> Errata W34,W56 --------------------------------------------------------- -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35194
