diff options
| author | Alexey Brodkin <abrodkin@synopsys.com> | 2018-01-24 23:22:33 +0300 |
|---|---|---|
| committer | Alexey Brodkin <abrodkin@synopsys.com> | 2018-03-21 16:21:34 +0300 |
| commit | 2178817c4a105ead044e054bf902f256e6d589c2 (patch) | |
| tree | b8fd816159aa1c08cdd29dad6fa69a8b3d5075cc /arch/arc/lib/memset.S | |
| parent | 9c0e2f6ed391f199ba1bf30c7d0b71123a012958 (diff) | |
arc: Get rid of handwritten string routines
U-Boot is a bit special piese of software because it is being
only executed once on power-on as compared to operating system
for example. That's why we don't care much about performance
optimizations instead we're more concerned about size. And up-to-date
compilers might produce much smaller code compared to
performance-optimized routines copy-pasted from the Linux kernel.
Here's an example:
------------------------------->8--------------------------
--- size_asm_strings.txt
+++ size_c_strings.txt
@@ -1,2 +1,2 @@
text data bss dec hex filename
- 121260 3784 3308 128352 1f560 u-boot
+ 120448 3784 3308 127540 1f234 u-boot
------------------------------->8--------------------------
See we were able to shave off ~800 bytes of .text section.
Also usage of string routines implemented in C gives us an ability
to support more HW flavors for free: generated instructions will match
our target as long as correct compiler option is used.
Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Diffstat (limited to 'arch/arc/lib/memset.S')
| -rw-r--r-- | arch/arc/lib/memset.S | 62 |
1 files changed, 0 insertions, 62 deletions
diff --git a/arch/arc/lib/memset.S b/arch/arc/lib/memset.S deleted file mode 100644 index 017e8af0e8..0000000000 --- a/arch/arc/lib/memset.S +++ /dev/null @@ -1,62 +0,0 @@ -/* - * Copyright (C) 2004, 2007-2010, 2011-2014 Synopsys, Inc. All rights reserved. - * - * SPDX-License-Identifier: GPL-2.0+ - */ - -#define SMALL 7 /* Must be at least 6 to deal with alignment/loop issues. */ - -.global memset -.align 4 -memset: - mov_s %r4, %r0 - or %r12, %r0, %r2 - bmsk.f %r12, %r12, 1 - extb_s %r1, %r1 - asl %r3, %r1, 8 - beq.d .Laligned - or_s %r1, %r1, %r3 - brls %r2, SMALL, .Ltiny - add %r3, %r2, %r0 - stb %r1, [%r3, -1] - bclr_s %r3, %r3, 0 - stw %r1, [%r3, -2] - bmsk.f %r12, %r0, 1 - add_s %r2, %r2, %r12 - sub.ne %r2, %r2, 4 - stb.ab %r1, [%r4, 1] - and %r4, %r4, -2 - stw.ab %r1, [%r4, 2] - and %r4, %r4, -4 - - .balign 4 -.Laligned: - asl %r3, %r1, 16 - lsr.f %lp_count, %r2, 2 - or_s %r1, %r1, %r3 - lpne .Loop_end - st.ab %r1, [%r4, 4] -.Loop_end: - j_s [%blink] - - .balign 4 -.Ltiny: - mov.f %lp_count, %r2 - lpne .Ltiny_end - stb.ab %r1, [%r4, 1] -.Ltiny_end: - j_s [%blink] - -/* - * memzero: @r0 = mem, @r1 = size_t - * memset: @r0 = mem, @r1 = char, @r2 = size_t - */ - -.global memzero -.align 4 -memzero: - /* adjust bzero args to memset args */ - mov %r2, %r1 - mov %r1, 0 - /* tail call so need to tinker with blink */ - b memset |