Hi Patrick.
Nitpick below.
Sam
+
+.Ls2alg:
+ lduh [%o1], %o3 /* know src is 2 byte aligned */
+ inc 2, %o1
+ srl %o3, 8, %o4
+ stb %o4, [%o0] /* have to do bytes, */
+ stb %o3, [%o0 + 1] /* don't know dst alingment */
+ inc 2, %o0
+ dec 2, %o2
+
+.Laldst:
+ andcc %o0, 3, %o5 /* align the destination address */
.Lald: bz,pn %icc, .Lw4cp
Label on own line would make patches more readable.
But src looks OK.
+ cmp %o5, 2
+ bz,pn %icc, .Lw2cp
+ cmp %o5, 3
+.Lw3cp:
+ lduw [%o1], %o4
+ inc 4, %o1
+ srl %o4, 24, %o5
+ stb %o5, [%o0]
+ bne,pt %icc, .Lw1cp
+ inc %o0
+ dec 1, %o2
+ andn %o2, 3, %o3 /* i3 is aligned word count */
+ dec 4, %o3 /* avoid reading beyond tail of src */
+ sub %o1, %o0, %o1 /* i1 gets the difference */
+
+1: sll %o4, 8, %g1 /* save residual bytes */
+ lduw [%o1+%o0], %o4
+ deccc 4, %o3
+ srl %o4, 24, %o5 /* merge with residual */
+ or %o5, %g1, %g1
+ st %g1, [%o0]
+ bnz,pt %XCC, 1b
+ inc 4, %o0
+ sub %o1, 3, %o1 /* used one byte of last word read */
+ and %o2, 3, %o2
+ b 7f
+ inc 4, %o2
+
+.Lw1cp:
+ srl %o4, 8, %o5
+ sth %o5, [%o0]
+ inc 2, %o0
+ dec 3, %o2
+ andn %o2, 3, %o3
+ dec 4, %o3 /* avoid reading beyond tail of src */
+ sub %o1, %o0, %o1 /* i1 gets the difference */
+
+2: sll %o4, 24, %g1 /* save residual bytes */
+ lduw [%o1+%o0], %o4
+ deccc 4, %o3
+ srl %o4, 8, %o5 /* merge with residual */
+ or %o5, %g1, %g1
+ st %g1, [%o0]
+ bnz,pt %XCC, 2b
+ inc 4, %o0
+ sub %o1, 1, %o1 /* used three bytes of last word read */
+ and %o2, 3, %o2
+ b 7f
+ inc 4, %o2
Delay slot - indent instruction with one space.
+
+.Lw2cp:
+ lduw [%o1], %o4
+ inc 4, %o1
+ srl %o4, 16, %o5
+ sth %o5, [%o0]
+ inc 2, %o0
+ dec 2, %o2
+ andn %o2, 3, %o3 /* i3 is aligned word count */
+ dec 4, %o3 /* avoid reading beyond tail of src */
+ sub %o1, %o0, %o1 /* i1 gets the difference */
+
+3: sll %o4, 16, %g1 /* save residual bytes */
+ lduw [%o1+%o0], %o4
+ deccc 4, %o3
+ srl %o4, 16, %o5 /* merge with residual */
+ or %o5, %g1, %g1
+ st %g1, [%o0]
+ bnz,pt %XCC, 3b
+ inc 4, %o0
+ sub %o1, 2, %o1 /* used two bytes of last word read */
+ and %o2, 3, %o2
+ b 7f
+ inc 4, %o2
+
+.Lw4cp:
+ andn %o2, 3, %o3 /* i3 is aligned word count */
+ sub %o1, %o0, %o1 /* i1 gets the difference */
+
+1: lduw [%o1+%o0], %o4 /* read from address */
+ deccc 4, %o3 /* decrement count */
+ st %o4, [%o0] /* write at destination address */
+ bg,pt %XCC, 1b
+ inc 4, %o0 /* increment to address */
+ b 7f
+ and %o2, 3, %o2 /* number of leftover bytes, if any */
+
+/*
+ * differenced byte copy, works with any alignment
+ */
+.Ldbytecp:
+ b 7f
+ sub %o1, %o0, %o1 /* i1 gets the difference */
+
+4: stb %o4, [%o0] /* write to address */
+ inc %o0 /* inc to address */
+7: deccc %o2 /* decrement count */
+ bge,a %XCC, 4b /* loop till done */
+ ldub [%o1+%o0], %o4 /* read from address */
+ retl
+ mov %g2, %o0 /* return pointer to destination */
+
+/*
+ * an overlapped copy that must be done "backwards"
+ */
+.Lovbc:
+ add %o1, %o2, %o1 /* get to end of source space */
+ add %o0, %o2, %o0 /* get to end of destination space */
+ sub %o1, %o0, %o1 /* i1 gets the difference */
+
+5: dec %o0 /* decrement to address */
+ ldub [%o1+%o0], %o3 /* read a byte */
+ deccc %o2 /* decrement count */
+ bg,pt %XCC, 5b /* loop until done */
+ stb %o3, [%o0] /* write byte */
+ retl
+ mov %g2, %o0 /* return pointer to destination */
+END(memmove)
+
+libc_hidden_builtin_def (memmove)