cmov: XOR within the ASM block #286

Job	Run time
build (1.60.0, thumbv7em-none-eabi)	1m 40s
build (1.60.0, wasm32-unknown-unknown)	2m 15s
build (stable, thumbv7em-none-eabi)	18s
build (stable, wasm32-unknown-unknown)	21s
cross (aarch64-unknown-linux-gnu, 1.60.0)	2m 20s
cross (aarch64-unknown-linux-gnu, stable)	38s
cross (powerpc-unknown-linux-gnu, 1.60.0)	2m 56s
cross (powerpc-unknown-linux-gnu, stable)	39s
test (i686-unknown-linux-gnu, ubuntu-latest, 1.60.0, sudo apt update && sudo apt install gcc-mult...	1m 35s
test (x86_64-unknown-linux-gnu, ubuntu-latest, 1.60.0)	1m 32s
test (x86_64-pc-windows-msvc, windows-latest, 1.60.0)	1m 13s
test (x86_64-apple-darwin, macos-latest, 1.60.0)	1m 33s
minimal-versions / minimal-versions	21s
	17m 21s

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