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esp32: Use FPU for floating point divide, power, complex multiplications

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* 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
This commit is contained in:
Angus Gratton 2019-05-16 10:36:48 +08:00 committed by Angus Gratton
parent 80fb837b29
commit d9a5c8f387
2 changed files with 1 additions and 4 deletions
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1
components/esp32/linker.lf
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@ -7,6 +7,7 @@ entries:
archive: libgcc.a
entries:
lib2funcs (noflash_text)
_divsf3 (noflash)
[mapping:gcov]
archive: libgcov.a

4
components/esp_rom/esp32/ld/esp32.rom.libgcc.ld
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@ -24,8 +24,6 @@ __ctzsi2 = 0x4000c7f0;
__divdc3 = 0x400645a4;
__divdf3 = 0x40002954;
__divdi3 = 0x4000ca84;
__divsc3 = 0x4006429c;
__divsf3 = 0x4000234c;
__divsi3 = 0x4000c7b8;
__eqdf2 = 0x400636a8;
__eqsf2 = 0x40063374;
@ -62,7 +60,6 @@ __modsi3 = 0x4000c7c0;
__muldc3 = 0x40063c90;
__muldf3 = 0x4006358c;
__muldi3 = 0x4000c9fc;
__mulsc3 = 0x40063944;
__mulsf3 = 0x400632c8;
__mulsi3 = 0x4000c7b0;
__mulvdi3 = 0x40002d78;
@ -80,7 +77,6 @@ __popcount_tab = 0x3ff96544;
__popcountdi2 = 0x40002ef8;
__popcountsi2 = 0x40002ed0;
__powidf2 = 0x400638e4;
__powisf2 = 0x4006389c;
__subdf3 = 0x400026e4;
__subsf3 = 0x400021d0;
__subvdi3 = 0x40002d20;