mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-09-30 00:20:44 +09:00
2178817c4a
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>
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|---|---|---|
| .. | ||
| _millicodethunk.S | ||
| bootm.c | ||
| cache.c | ||
| cpu.c | ||
| init_helpers.c | ||
| interrupts.c | ||
| ints_low.S | ||
| libgcc2.c | ||
| libgcc2.h | ||
| Makefile | ||
| relocate.c | ||
| reset.c | ||
| start.S | ||