ec: Use 3 fewer squarings for P-256 scalar inversion. #3950

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Job	Run time
clippy	15s
audit	7s
coverage (--features=std, aarch64-apple-darwin, nightly)	43s
cargo-semver-checks	20s
coverage (--features=std, aarch64-unknown-linux-gnu, nightly)	2m 37s
deny	6s
coverage (--features=std, arm-unknown-linux-gnueabi, nightly)	2m 52s
package	1m 31s
coverage (--features=std, armv7-unknown-linux-gnueabihf, nightly)	2m 49s
coverage (--features=std, powerpc-unknown-linux-gnu, nightly)	13m 9s
rustdoc	9s
rustfmt	6s
coverage (--features=std, powerpc64-unknown-linux-gnu, nightly)	4m 14s
coverage (--features=std, powerpc64le-unknown-linux-gnu, nightly)	3m 35s
test-bench	30s
coverage (--features=std, riscv64gc-unknown-linux-gnu, nightly)	3m 49s
coverage (--features=std, s390x-unknown-linux-gnu, nightly)	5m 2s
test-doc (stable)	18s
coverage (--features=std, x86_64-apple-darwin, nightly)	1m 19s
test-doc (nightly)	24s
test (aarch64-apple-darwin, stable)	30s
coverage (--features=std, x86_64-unknown-linux-musl, nightly)	1m 3s
test-features (--no-default-features, aarch64-unknown-linux-musl, --release, stable)	6m 15s
test (aarch64-apple-darwin, 1.63.0)	1m 39s
coverage (--features=unstable-testing-arm-no-hw,std, aarch64-unknown-linux-gnu, nightly, ubuntu-2...	2m 42s
test-features (--no-default-features, aarch64-unknown-linux-musl, --release, nightly)	6m 6s
test (aarch64-apple-darwin, --release, stable)	1m 36s
coverage (--features=unstable-testing-arm-no-neon,std, armv7-unknown-linux-gnueabihf, nightly, ub...	3m 11s
test-features (--no-default-features, aarch64-unknown-linux-musl, --release, 1.63.0)	7m 18s
test (aarch64-apple-darwin, --release, 1.63.0)	2m 36s
coverage (i686-unknown-linux-gnu, --features=std, nightly, ubuntu-22.04)	1m 26s
test-wasm32-browser (--features=wasm32_unknown_unknown_js, ubuntu-22.04, stable, wasm32-unknown-u...	3m 21s
test-features (--no-default-features, i686-pc-windows-msvc, --release, stable)	5m 41s
coverage (i686-unknown-linux-gnu, --features=std, nightly, Conroe-v1, ubuntu-22.04)	5m 42s
test (aarch64-apple-ios, stable)	22s
test-wasm32-browser (--features=wasm32_unknown_unknown_js, ubuntu-22.04, beta, wasm32-unknown-unk...	3m 31s
test-features (--no-default-features, i686-pc-windows-msvc, --release, nightly)	4m 58s
coverage (x86_64-unknown-linux-gnu, --features=std, nightly, Conroe-v1, ubuntu-22.04)	2m 54s
test (aarch64-apple-ios, 1.63.0)	1m 24s
test-wasm32-browser (--features=wasm32_unknown_unknown_js, ubuntu-22.04, nightly, wasm32-unknown-...	3m 23s
test-features (--no-default-features, i686-pc-windows-msvc, --release, 1.63.0)	6m 13s
coverage (x86_64-unknown-linux-gnu, --features=std, nightly, Denverton-v2, ubuntu-22.04)	2m 57s
test (aarch64-apple-ios, --release, stable)	1m 6s
test-wasm32-browser (--features=wasm32_unknown_unknown_js, ubuntu-22.04, --release, stable, wasm3...	5m 1s
test-features (--no-default-features, x86_64-unknown-linux-gnu, --release, stable)	1m 55s
test-wasm32-browser (--features=wasm32_unknown_unknown_js, ubuntu-22.04, --release, beta, wasm32-...	5m 21s
test (aarch64-apple-ios, --release, 1.63.0)	1m 46s
test-features (--no-default-features, x86_64-unknown-linux-gnu, --release, nightly)	1m 59s
test (aarch64-linux-android, stable)	40s
test-wasm32-browser (--features=wasm32_unknown_unknown_js, ubuntu-22.04, --release, nightly, wasm...	5m 4s
test-features (--no-default-features, x86_64-unknown-linux-gnu, --release, 1.63.0)	3m 6s
test (aarch64-linux-android, 1.63.0)	1m 39s
test-wasm32-browser (--no-default-features --features=wasm32_unknown_unknown_js, ubuntu-22.04, st...	3m 19s
test-features (--features=std,slow_tests, aarch64-unknown-linux-musl, --release, stable)	9m 54s
test (aarch64-linux-android, --release, stable)	57s
test-wasm32-browser (--no-default-features --features=wasm32_unknown_unknown_js, ubuntu-22.04, be...	3m 29s
test (aarch64-linux-android, --release, 1.63.0)	2m 27s
test-features (--features=std,slow_tests, aarch64-unknown-linux-musl, --release, nightly)	10m 19s
test-wasm32-browser (--no-default-features --features=wasm32_unknown_unknown_js, ubuntu-22.04, ni...	3m 24s
test (aarch64-pc-windows-msvc, stable)	2m 19s
test-features (--features=std,slow_tests, aarch64-unknown-linux-musl, --release, 1.63.0)	11m 10s
test-wasm32-browser (--no-default-features --features=wasm32_unknown_unknown_js, ubuntu-22.04, --...	5m 19s
test-features (--features=std,slow_tests, i686-pc-windows-msvc, --release, stable)	7m 59s
test (aarch64-pc-windows-msvc, 1.63.0)	2m 30s
test-features (--features=std,slow_tests, i686-pc-windows-msvc, --release, nightly)	7m 47s
test-wasm32-browser (--no-default-features --features=wasm32_unknown_unknown_js, ubuntu-22.04, --...	5m 10s
test (aarch64-pc-windows-msvc, --release, stable)	2m 18s
test-wasm32-browser (--no-default-features --features=wasm32_unknown_unknown_js, ubuntu-22.04, --...	5m 3s
test-features (--features=std,slow_tests, i686-pc-windows-msvc, --release, 1.63.0)	9m 7s
test (aarch64-pc-windows-msvc, --release, 1.63.0)	3m 24s
test (aarch64-unknown-linux-gnu, stable)	2m 22s
test-features (--features=std,slow_tests, x86_64-unknown-linux-gnu, --release, stable)	2m 38s
test (aarch64-unknown-linux-gnu, 1.63.0)	5m 37s
test-features (--features=std,slow_tests, x86_64-unknown-linux-gnu, --release, nightly)	2m 41s
test (aarch64-unknown-linux-gnu, --release, stable)	5m 58s
test-features (--features=std,slow_tests, x86_64-unknown-linux-gnu, --release, 1.63.0)	3m 47s
test (aarch64-unknown-linux-gnu, --release, 1.63.0)	7m 22s
test (aarch64-unknown-linux-musl, stable)	2m 15s
test (aarch64-unknown-linux-musl, 1.63.0)	5m 33s
test (aarch64-unknown-linux-musl, --release, stable)	6m 2s
test (aarch64-unknown-linux-musl, --release, 1.63.0)	7m 28s
test (arm-unknown-linux-gnueabi, stable)	2m 21s
test (arm-unknown-linux-gnueabi, 1.63.0)	5m 27s
test (arm-unknown-linux-gnueabi, --release, stable)	5m 44s
test (arm-unknown-linux-gnueabi, --release, 1.63.0)	7m 41s
test (armv7-linux-androideabi, stable)	35s
test (armv7-linux-androideabi, 1.63.0)	1m 41s
test (armv7-linux-androideabi, --release, stable)	59s
test (armv7-linux-androideabi, --release, 1.63.0)	2m 19s
test (armv7-unknown-linux-musleabihf, stable)	2m 27s
test (armv7-unknown-linux-musleabihf, 1.63.0)	5m 42s
test (armv7-unknown-linux-musleabihf, --release, stable)	5m 54s
test (armv7-unknown-linux-musleabihf, --release, 1.63.0)	6m 55s
test (i686-pc-windows-msvc, stable)	2m 26s
test (i686-pc-windows-msvc, 1.63.0)	2m 30s
test (i686-pc-windows-msvc, --release, stable)	6m 22s
test (i686-pc-windows-msvc, --release, 1.63.0)	6m 8s
test (i686-unknown-linux-gnu, stable)	1m 9s
test (i686-unknown-linux-gnu, 1.63.0)	2m 30s
test (i686-unknown-linux-gnu, --release, stable)	4m 2s
test (i686-unknown-linux-gnu, --release, 1.63.0)	5m 22s
test (i686-unknown-linux-musl, stable)	1m 5s
test (i686-unknown-linux-musl, 1.63.0)	2m 32s
test (i686-unknown-linux-musl, --release, stable)	4m 25s
test (i686-unknown-linux-musl, --release, 1.63.0)	5m 29s
test (riscv64gc-unknown-linux-gnu, stable)	3m 21s
test (riscv64gc-unknown-linux-gnu, 1.63.0)	5m 11s
test (riscv64gc-unknown-linux-gnu, --release, stable)	4m 44s
test (riscv64gc-unknown-linux-gnu, --release, 1.63.0)	5m 57s
test (wasm32-wasi, stable)	2m 24s
test (wasm32-wasi, 1.63.0)	3m 47s
test (wasm32-wasi, --release, stable)	4m 12s
test (wasm32-wasi, --release, 1.63.0)	5m 15s
test (x86_64-pc-windows-gnu, stable)	2m 12s
test (x86_64-pc-windows-gnu, 1.63.0)	2m 19s
test (x86_64-pc-windows-gnu, --release, stable)	4m 14s
test (x86_64-pc-windows-gnu, --release, 1.63.0)	4m 3s
test (x86_64-pc-windows-msvc, stable)	2m 7s
test (x86_64-pc-windows-msvc, 1.63.0)	2m 26s
test (x86_64-pc-windows-msvc, --release, stable)	3m 32s
test (x86_64-pc-windows-msvc, --release, 1.63.0)	3m 45s
test (x86_64-apple-darwin, stable)	1m 1s
test (x86_64-apple-darwin, 1.63.0)	3m 36s
test (x86_64-apple-darwin, --release, stable)	3m 28s
test (x86_64-apple-darwin, --release, 1.63.0)	4m 48s
test (x86_64-unknown-linux-musl, stable)	50s
test (x86_64-unknown-linux-musl, 1.63.0)	2m 3s
test (x86_64-unknown-linux-musl, --release, stable)	1m 59s
test (x86_64-unknown-linux-musl, --release, 1.63.0)	3m 2s
test (x86_64-unknown-linux-gnu, stable)	43s
test (x86_64-unknown-linux-gnu, 1.63.0)	1m 47s
test (x86_64-unknown-linux-gnu, --release, stable)	1m 46s
test (x86_64-unknown-linux-gnu, --release, 1.63.0)	2m 59s
test (aarch64-apple-tvos, nightly, --release, macos-14, --no-run -Z build-std)	1m 22s
test (aarch64-apple-visionos, nightly, --release, macos-14, 15.2, --no-run -Z build-std)	1m 7s
test (aarch64-apple-watchos, nightly, --release, macos-14, --no-run -Z build-std)	1m 18s
test (mips-unknown-linux-gnu, --release, 1.71.0, ubuntu-22.04)	7m 42s
test (mips64el-unknown-linux-gnuabi64, --release, 1.71.0, ubuntu-22.04)	4m 59s
test (mipsel-unknown-linux-gnu, --release, 1.71.0, ubuntu-22.04)	7m 39s
test (powerpc-unknown-linux-gnu, --release, stable, ubuntu-22.04)	7m 52s
test (powerpc64-unknown-linux-gnu, --release, stable, ubuntu-22.04)	5m 14s
test (powerpc64le-unknown-linux-gnu, --release, stable, ubuntu-22.04)	6m 6s
test (s390x-unknown-linux-gnu, --release, stable, ubuntu-22.04)	10m 31s
	8h 47m 4s

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ec: Use 3 fewer squarings for P-256 scalar inversion. #3950

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ec: Use 3 fewer squarings for P-256 scalar inversion. #3950

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