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android_bionic/libc/arch-arm/cortex-a9/bionic/strcpy.S

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Optimize strcat/strcpy, small tweaks to strlen. DO NOT MERGE Create one version of strcat/strcpy/strlen for cortex-a15/krait and another version for cortex-a9. Tested with the libc_test strcat/strcpy/strlen tests. Including new tests that verify that the src for strcat/strcpy do not overread across page boundaries. NOTE: The handling of unaligned strcpy (same code in strcat) could probably be optimized further such that the src is read 64 bits at a time instead of the partial reads occurring now. strlen improves slightly since it was recently optimized. Performance improvements for strcpy and strcat (using an empty dest string): cortex-a9 - Small copies vary from about 5% to 20% as the size gets above 10 bytes. - Copies >= 1024, about a 60% improvement. - Unaligned copies, from about 40% improvement. cortex-a15 - Most small copies exhibit a 100% improvement, a few copies only improve by 20%. - Copies >= 1024, about 150% improvement. - Unaligned copies, about 100% improvement. krait - Most small copies vary widely, but on average 20% improvement, then the performance gets better, hitting about a 100% improvement when copies 64 bytes of data. - Copies >= 1024, about 100% improvement. - When coping MBs of data, about 50% improvement. - Unaligned copies, about 90% improvement. As strcat destination strings get larger in size: cortex-a9 - about 40% improvement for small dst strings (>= 32). - about 250% improvement for dst strings >= 1024. cortex-a15 - about 200% improvement for small dst strings (>=32). - about 250% improvement for dst strings >= 1024. krait - about 25% improvement for small dst strings (>=32). - about 100% improvement for dst strings >=1024. Merge from internal master. (cherry-picked from d119b7b6f48fe507088cfb98bcafa99b320fd884) Change-Id: I296463b251ef9fab004ee4dded2793feca5b547a
2013-07-15 19:49:26 +00:00
/*
Add stpcpy assembler version. For generic, continue to use the C version of the code. Bug: 13746695 Change-Id: I77426a70b06131f2373bb51265bea1240bb3f101
2014-09-30 18:53:13 +00:00
* Copyright (C) 2014 The Android Open Source Project
Optimize strcat/strcpy, small tweaks to strlen. DO NOT MERGE Create one version of strcat/strcpy/strlen for cortex-a15/krait and another version for cortex-a9. Tested with the libc_test strcat/strcpy/strlen tests. Including new tests that verify that the src for strcat/strcpy do not overread across page boundaries. NOTE: The handling of unaligned strcpy (same code in strcat) could probably be optimized further such that the src is read 64 bits at a time instead of the partial reads occurring now. strlen improves slightly since it was recently optimized. Performance improvements for strcpy and strcat (using an empty dest string): cortex-a9 - Small copies vary from about 5% to 20% as the size gets above 10 bytes. - Copies >= 1024, about a 60% improvement. - Unaligned copies, from about 40% improvement. cortex-a15 - Most small copies exhibit a 100% improvement, a few copies only improve by 20%. - Copies >= 1024, about 150% improvement. - Unaligned copies, about 100% improvement. krait - Most small copies vary widely, but on average 20% improvement, then the performance gets better, hitting about a 100% improvement when copies 64 bytes of data. - Copies >= 1024, about 100% improvement. - When coping MBs of data, about 50% improvement. - Unaligned copies, about 90% improvement. As strcat destination strings get larger in size: cortex-a9 - about 40% improvement for small dst strings (>= 32). - about 250% improvement for dst strings >= 1024. cortex-a15 - about 200% improvement for small dst strings (>=32). - about 250% improvement for dst strings >= 1024. krait - about 25% improvement for small dst strings (>=32). - about 100% improvement for dst strings >=1024. Merge from internal master. (cherry-picked from d119b7b6f48fe507088cfb98bcafa99b320fd884) Change-Id: I296463b251ef9fab004ee4dded2793feca5b547a
2013-07-15 19:49:26 +00:00
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Add stpcpy assembler version. For generic, continue to use the C version of the code. Bug: 13746695 Change-Id: I77426a70b06131f2373bb51265bea1240bb3f101
2014-09-30 18:53:13 +00:00
#define STRCPY
#include "string_copy.S"