arm64: fpsimd: avoid restoring fpcr if the contents haven't changed

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Writing to the FPCR is commonly implemented as a self-synchronising
operation in the CPU, so avoid writing to the register when the saved
value matches that in the hardware already.

Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

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Will Deacon 2014-07-10 12:40:09 +01:00 • committed by Catalin Marinas

parent ad789ba5f7

commit 5959e25729

1 changed files with 15 additions and 2 deletions

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arch/arm64/include/asm/fpsimdmacros.h

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