Michal Simek 95fee37be4 microblaze: Do loop unrolling for optimized memset implementation ... Align implementation with memcpy and memmove where also remaining bytes are copied via final switch case instead of using simple implementations which loop. But this alignment has much stronger reason and definitely aligning implementation is not the key point here. It is just good to have in mind that the same technique is used already there. In GCC 10, now -ftree-loop-distribute-patterns optimization is on at O2. This optimization causes GCC to convert the while loop in memset.c into a call to memset. So this optimization is transforming a loop in a memset/memcpy into a call to the function itself. This makes the memset implementation as recursive. "-freestanding" option will disable the built-in library function but it has been added in generic library implementation. In default microblaze kernel defconfig we have CONFIG_OPT_LIB_FUNCTION enabled so it will always pick optimized version of memset which is target specific so we are replacing the while() loop with switch case to avoid recursive memset call. Issue with freestanding was already discussed in connection to commit 33d0f96ffd ("lib/string.c: Use freestanding environment") and also this is topic in glibc and gcc. https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56888 http://patchwork.ozlabs.org/project/glibc/patch/20191121021040.14554-1-sandra@codesourcery.com/ Signed-off-by: Michal Simek <michal.simek@xilinx.com> Signed-off-by: Mahesh Bodapati <mbodapat@xilinx.com> Link: https://lore.kernel.org/r/10a432e269a6d3349cf458e4f5792522779cba0d.1645797329.git.michal.simek@xilinx.com		2022-04-21 10:54:20 +02:00
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ashldi3.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
ashrdi3.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
cmpdi2.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
divsi3.S	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
fastcopy.S	microblaze: Setup dependencies for ASM optimized lib functions	2018-03-16 12:51:26 +01:00
libgcc.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
lshrdi3.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
Makefile	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
memcpy.c	microblaze: add 'fallthrough' to memcpy/memset/memmove	2021-04-22 09:34:05 +02:00
memmove.c	microblaze: add 'fallthrough' to memcpy/memset/memmove	2021-04-22 09:34:05 +02:00
memset.c	microblaze: Do loop unrolling for optimized memset implementation	2022-04-21 10:54:20 +02:00
modsi3.S	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
muldi3.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
mulsi3.S	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
uaccess_old.S	microblaze: use generic strncpy/strnlen from_user	2021-07-27 23:01:13 +02:00
ucmpdi2.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
udivsi3.S	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
umodsi3.S	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00