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Brian Kessler 30b045d4d1 math/big: handle negative exponents in Exp 
For modular exponentiation, negative exponents can be handled using
the following relation.

for y < 0: x**y mod m == (x**(-1))**|y| mod m

First compute ModInverse(x, m) and then compute the exponentiation
with the absolute value of the exponent.  Non-modular exponentiation
with a negative exponent still returns 1.

Fixes #25865

Change-Id: I2a35986a24794b48e549c8de935ac662d217d8a0
Reviewed-on: https://go-review.googlesource.com/118562
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
2018-06-14 22:26:30 +00:00
.github .github: use HTTPS for Stack Overflow link in SUPPORT.md 2018-06-12 11:08:14 +00:00
api syscall: update TOKEN_ALL_ACCESS according to WinNT.h 2018-06-11 00:45:20 +00:00
doc doc: fix fmt usage in code.html 2018-06-13 22:00:24 +00:00
lib/time lib/time: update vendored tzdata to release 2018e 2018-06-11 14:47:06 +00:00
misc runtime, sycall/js: add support for callbacks from JavaScript 2018-06-14 21:50:53 +00:00
src math/big: handle negative exponents in Exp 2018-06-14 22:26:30 +00:00
test cmd/compile: ensure that operand of ORETURN is not double-walked 2018-06-14 20:08:10 +00:00
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README.md

The Go Programming Language

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