cmov: XOR within the ASM block #284

Job	Run time
build (1.60.0, thumbv7em-none-eabi)	2m 7s
build (1.60.0, wasm32-unknown-unknown)	2m 4s
build (stable, thumbv7em-none-eabi)	14s
build (stable, wasm32-unknown-unknown)	10s
cross (aarch64-unknown-linux-gnu, 1.60.0)	2m 23s
cross (aarch64-unknown-linux-gnu, stable)	2m 0s
cross (powerpc-unknown-linux-gnu, 1.60.0)	2m 37s
cross (powerpc-unknown-linux-gnu, stable)	42s
test (i686-unknown-linux-gnu, ubuntu-latest, 1.60.0, sudo apt update && sudo apt install gcc-mult...	53s
test (x86_64-unknown-linux-gnu, ubuntu-latest, 1.60.0)	55s
test (x86_64-pc-windows-msvc, windows-latest, 1.60.0)	35s
test (x86_64-apple-darwin, macos-latest, 1.60.0)	51s
minimal-versions / minimal-versions	24s
	15m 55s

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