cmov: XOR within the ASM block #290

Job	Run time
test (i686-unknown-linux-gnu, ubuntu-latest, 1.60.0, sudo apt update && sudo apt install gcc-mult...	2m 40s
test (x86_64-unknown-linux-gnu, ubuntu-latest, 1.60.0)	2m 16s
test (x86_64-pc-windows-msvc, windows-latest, 1.60.0)	1m 8s
test (x86_64-apple-darwin, macos-latest, 1.60.0)	3m 19s
build (1.60.0, thumbv7em-none-eabi)	2m 0s
build (1.60.0, wasm32-unknown-unknown)	2m 23s
build (stable, thumbv7em-none-eabi)	11s
build (stable, wasm32-unknown-unknown)	8s
cross (aarch64-unknown-linux-gnu, 1.60.0)	2m 59s
cross (aarch64-unknown-linux-gnu, stable)	35s
cross (powerpc-unknown-linux-gnu, 1.60.0)	2m 55s
cross (powerpc-unknown-linux-gnu, stable)	46s
minimal-versions / minimal-versions	25s
	21m 45s

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