Angus Gratton d9a5c8f387 esp32: Use FPU for floating point divide, power, complex multiplications ...

* Linker was choosing ROM symbols for these, which use integer soft-float
  operations and are much slower.
* _divsf3() moved to IRAM to avoid regressions with any code that does
  integer float division in IRAM interrupt handlers (+88 bytes IRAM)
* Thanks to michal for reporting:
  https://esp32.com/viewtopic.php?f=14&t=10540&p=43367

2019-05-29 10:14:31 +10:00

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