k256

p256: add 32-bit arithmetic and optimizations (#1033) #2157

Job	Run time
benches (1.73.0)	1m 21s
build (1.73.0, thumbv7em-none-eabi)	42s
benches (stable)	1m 14s
build (1.73.0, wasm32-unknown-unknown)	46s
cross (armv7-unknown-linux-gnueabihf, 1.73.0)	1m 32s
build (stable, thumbv7em-none-eabi)	1m 24s
cross (armv7-unknown-linux-gnueabihf, stable)	1m 47s
doc	1m 31s
build (stable, wasm32-unknown-unknown)	43s
cross (aarch64-unknown-linux-gnu, 1.73.0)	1m 37s
cross (aarch64-unknown-linux-gnu, stable)	1m 29s
test (i686-unknown-linux-gnu, 1.73.0, sudo apt update && sudo apt install gcc-multilib)	2m 0s
cross (powerpc-unknown-linux-gnu, 1.73.0)	1m 46s
test (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	2m 6s
cross (powerpc-unknown-linux-gnu, stable)	1m 32s
test (x86_64-unknown-linux-gnu, 1.73.0)	1m 43s
test (x86_64-unknown-linux-gnu, stable)	2m 5s
	25m 18s

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