diff options
Diffstat (limited to 'libc/string/mips/memset.S')
| -rw-r--r-- | libc/string/mips/memset.S | 71 |
1 files changed, 69 insertions, 2 deletions
diff --git a/libc/string/mips/memset.S b/libc/string/mips/memset.S index 9169ad58a..ff0554ff9 100644 --- a/libc/string/mips/memset.S +++ b/libc/string/mips/memset.S @@ -22,11 +22,76 @@ #include <endian.h> #include "sysdep.h" +/* void *memset(void *s, int c, size_t n). */ + #ifdef __mips64 -#error mips32 code being compiled for mips64! + +#include <sys/asm.h> + +#if __BYTE_ORDER == __BIG_ENDIAN +# define SDHI sdl /* high part is left in big-endian */ +#else +# define SDHI sdr /* high part is right in little-endian */ #endif -/* void *memset(void *s, int c, size_t n). */ +ENTRY (memset) + .set noreorder + + slti ta1, a2, 16 # Less than 16? + bne ta1, zero, L(last16) + move v0, a0 # Setup exit value before too late + + beq a1, zero, L(ueven) # If zero pattern, no need to extend + andi a1, 0xff # Avoid problems with bogus arguments + dsll ta0, a1, 8 + or a1, ta0 + dsll ta0, a1, 16 + or a1, ta0 # a1 is now pattern in full word + dsll ta0, a1, 32 + or a1, ta0 # a1 is now pattern in double word + +L(ueven): + PTR_SUBU ta0, zero, a0 # Unaligned address? + andi ta0, 0x7 + beq ta0, zero, L(chkw) + PTR_SUBU a2, ta0 + SDHI a1, 0(a0) # Yes, handle first unaligned part + PTR_ADDU a0, ta0 # Now both a0 and a2 are updated + +L(chkw): + andi ta0, a2, 0xf # Enough left for one loop iteration? + beq ta0, a2, L(chkl) + PTR_SUBU a3, a2, ta0 + PTR_ADDU a3, a0 # a3 is last loop address +1 + move a2, ta0 # a2 is now # of bytes left after loop +L(loopw): + PTR_ADDIU a0, 16 # Handle 2 dwords pr. iteration + sd a1, -16(a0) + bne a0, a3, L(loopw) + sd a1, -8(a0) + +L(chkl): + andi ta0, a2, 0x8 # Check if there is at least a double + beq ta0, zero, L(last16) # word remaining after the loop + PTR_SUBU a2, ta0 + sd a1, 0(a0) # Yes... + PTR_ADDIU a0, 8 + +L(last16): + blez a2, L(exit) # Handle last 16 bytes (if cnt>0) + PTR_ADDU a3, a2, a0 # a3 is last address +1 +L(lst16l): + PTR_ADDIU a0, 1 + bne a0, a3, L(lst16l) + sb a1, -1(a0) +L(exit): + j ra # Bye, bye + nop + + .set reorder +END (memset) + +#else /* !__mips64 */ #if __BYTE_ORDER == __BIG_ENDIAN # define SWHI swl /* high part is left in big-endian */ @@ -89,4 +154,6 @@ L(exit): .set reorder END (memset) +#endif /* !__mips64 */ + libc_hidden_def(memset) |