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* libc/machine/rx/strncat.S (_strncat): Replace use of r6

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(call-saved) with r14 (call-used).
This commit is contained in:
Nick Clifton 2009-11-20 12:54:29 +00:00
parent 7a35264853
commit 0680fe0a6e
2 changed files with 9 additions and 4 deletions
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5
newlib/ChangeLog
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@ -1,3 +1,8 @@
2009-11-20 Nick Clifton <nickc@redhat.com>
* libc/machine/rx/strncat.S (_strncat): Replace use of r6
(call-saved) with r14 (call-used).
2009-11-18 Dave Korn <dave.korn.cygwin@googlemail.com>
* libm/machine/i386/f_tan.S (_f_tan): Free fp stack register

8
newlib/libc/machine/rx/strncat.S
View File

@ -10,25 +10,25 @@ _strncat:
mov r1, r4 ; Save a copy of the dest pointer.
mov r2, r5 ; Save a copy of the source pointer.
mov r3, r6 ; Save a copy of the byte count.
mov r3, r14 ; Save a copy of the byte count.
mov #0, r2 ; Search for the NUL byte.
mov #-1, r3 ; Search until we run out of memory.
suntil.b ; Find the end of the destination string.
sub #1, r1 ; suntil.b leaves r1 pointing to the byte beyond the NUL.
mov r6, r3 ; Restore the limit on the number of bytes copied.
mov r14, r3 ; Restore the limit on the number of bytes copied.
mov r5, r2 ; Restore the source pointer.
mov r1, r5 ; Save a copy of the dest pointer.
smovu ; Copy source to destination.
add #0, r6, r3 ; Restore the number of bytes to copy (again), but this time set the Z flag as well.
add #0, r14, r3 ; Restore the number of bytes to copy (again), but this time set the Z flag as well.
beq 1f ; If we copied 0 bytes then we already know that the dest string is NUL terminated, so we do not have to do anything.
mov #0, r2 ; Otherwise we must check to see if a NUL byte
mov r5, r1 ; was included in the bytes that were copied.
suntil.b
beq 1f ; Z flag is set if a match was found.
add r6, r5 ; Point at byte after end of copied bytes.
add r14, r5 ; Point at byte after end of copied bytes.
mov.b #0, [r5] ; Store a NUL there.
1:
mov r4, r1 ; Return the original dest pointer.