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Damian Gryski authored
This patch adds a function to get the current cpu ticks. This is deemed to be 'sufficiently random' to use to seed fastrand to mitigate the algorithmic complexity attacks on the hash table implementation. On AMD64 we use the RDTSC instruction. For 386, this instruction, while valid, is not recognized by 8a so I've inserted the opcode by hand. For ARM, this routine is currently stubbed to return a constant 0 value. Future work: update 8a to recognize RDTSC. Fixes #2630. R=rsc CC=golang-dev https://golang.org/cl/5606048
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