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Re: [PATCH][AArch64] Optimized memset


-----Original Message-----
From: Wilco Dijkstra [] 
Sent: 31 July 2015 16:02
To: 'GNU C Library'
Subject: [PATCH][AArch64] Optimized memset

This is an optimized memset for AArch64. Memset is split into 4 main cases: small sets of up to 16 bytes, medium of 16..96 bytes which are fully unrolled. Large memsets of more than 96 bytes align the destination and use an unrolled loop processing 64 bytes per iteration. Memsets of zero of more than 256 use the dc zva instruction, and there are faster versions for the common ZVA sizes 64 or 128. STP of Q registers is used to reduce codesize without loss of performance.

Speedup on test-memset is 1% on Cortex-A57 and 8% on Cortex-A53. On a random test with varying sizes and alignment the new version is 50% faster.

OK for commit?

2015-07-31  Wilco Dijkstra  <>

	* sysdeps/aarch64/memset.S (__memset): 
	Rewrite of optimized memset.

Attachment: 0001-Optimized-memset.txt
Description: 0001-Optimized-memset.txt

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