FreeCalypso > hg > freecalypso-tools
changeset 93:a675cec34076
target-utils/libc: assembly implementation of bcmp/memcmp
| author | Mychaela Falconia <falcon@freecalypso.org> |
|---|---|
| date | Sat, 29 Oct 2016 00:15:12 +0000 |
| parents | bfed7a5c21a6 |
| children | cbc6bc05d494 |
| files | target-utils/libc/Makefile target-utils/libc/memcmp.S |
| diffstat | 2 files changed, 23 insertions(+), 3 deletions(-) [+] |
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--- a/target-utils/libc/Makefile Fri Oct 28 23:45:49 2016 +0000 +++ b/target-utils/libc/Makefile Sat Oct 29 00:15:12 2016 +0000 @@ -4,9 +4,9 @@ AR= arm-elf-ar RANLIB= arm-elf-ranlib -OBJS= atoi.o bzero.o ctype_.o index.o memcpy.o memcpy16.o memcpy32.o memset.o\ - rindex.o strcasecmp.o strcat.o strcmp.o strcpy.o strncat.o strncmp.o \ - strncpy.o +OBJS= atoi.o bzero.o ctype_.o index.o memcmp.o memcpy.o memcpy16.o memcpy32.o\ + memset.o rindex.o strcasecmp.o strcat.o strcmp.o strcpy.o strncat.o \ + strncmp.o strncpy.o all: libc.a
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/target-utils/libc/memcmp.S Sat Oct 29 00:15:12 2016 +0000 @@ -0,0 +1,20 @@ + .text + .code 32 + .globl bcmp + .globl memcmp +bcmp: +memcmp: + cmp r2, #0 + beq zero_len_out + mov r3, r0 +1: ldrb r0, [r3], #1 + ldrb r12, [r1], #1 + subs r0, r0, r12 + bxne lr + subs r2, r2, #1 + bne 1b + bx lr + +zero_len_out: + mov r0, #0 + bx lr