diff options
Diffstat (limited to 'lib/libc/arm/string/memmove.S')
| -rw-r--r-- | lib/libc/arm/string/memmove.S | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/lib/libc/arm/string/memmove.S b/lib/libc/arm/string/memmove.S index 94e5474..2cd5a5e 100644 --- a/lib/libc/arm/string/memmove.S +++ b/lib/libc/arm/string/memmove.S @@ -48,7 +48,9 @@ ENTRY(bcopy) #endif /* Do the buffers overlap? */ cmp r0, r1 + it eq RETeq /* Bail now if src/dst are the same */ + ite cc subcc r3, r0, r1 /* if (dst > src) r3 = dst - src */ subcs r3, r1, r0 /* if (src > dsr) r3 = src - dst */ cmp r3, r2 /* if (r3 < len) we have an overlap */ @@ -56,8 +58,10 @@ ENTRY(bcopy) /* Determine copy direction */ cmp r1, r0 + it cc bcc .Lmemmove_backwards + itt eq moveq r0, #0 /* Quick abort for len=0 */ RETeq @@ -88,6 +92,7 @@ ENTRY(bcopy) bge .Lmemmove_floop32 cmn r2, #0x10 + ittt ge ldmiage r1!, {r3, r4, r12, lr} /* blat a remaining 16 bytes */ stmiage r0!, {r3, r4, r12, lr} subge r2, r2, #0x10 @@ -98,6 +103,7 @@ ENTRY(bcopy) /* blat 12 bytes at a time */ .Lmemmove_floop12: + ittt ge ldmiage r1!, {r3, r12, lr} stmiage r0!, {r3, r12, lr} subsge r2, r2, #0x0c @@ -108,8 +114,10 @@ ENTRY(bcopy) blt .Lmemmove_fl4 subs r2, r2, #4 + itt lt ldrlt r3, [r1], #4 strlt r3, [r0], #4 + ittt ge ldmiage r1!, {r3, r12} stmiage r0!, {r3, r12} subge r2, r2, #4 @@ -117,14 +125,17 @@ ENTRY(bcopy) .Lmemmove_fl4: /* less than 4 bytes to go */ adds r2, r2, #4 + it eq ldmiaeq sp!, {r0, pc} /* done */ /* copy the crud byte at a time */ cmp r2, #2 ldrb r3, [r1], #1 strb r3, [r0], #1 + itt ge ldrbge r3, [r1], #1 strbge r3, [r0], #1 + itt gt ldrbgt r3, [r1], #1 strbgt r3, [r0], #1 ldmia sp!, {r0, pc} @@ -137,8 +148,10 @@ ENTRY(bcopy) /* align destination with byte copies */ ldrb r3, [r1], #1 strb r3, [r0], #1 + itt ge ldrbge r3, [r1], #1 strbge r3, [r0], #1 + itt gt ldrbgt r3, [r1], #1 strbgt r3, [r0], #1 subs r2, r2, r12 @@ -355,10 +368,12 @@ ENTRY(bcopy) .Lmemmove_bl32: cmn r2, #0x10 + ittt ge ldmdbge r1!, {r3, r4, r12, lr} /* blat a remaining 16 bytes */ stmdbge r0!, {r3, r4, r12, lr} subge r2, r2, #0x10 adds r2, r2, #0x14 + ittt ge ldmdbge r1!, {r3, r12, lr} /* blat a remaining 12 bytes */ stmdbge r0!, {r3, r12, lr} subge r2, r2, #0x0c @@ -368,8 +383,10 @@ ENTRY(bcopy) adds r2, r2, #8 blt .Lmemmove_bl4 subs r2, r2, #4 + itt lt ldrlt r3, [r1, #-4]! strlt r3, [r0, #-4]! + ittt ge ldmdbge r1!, {r3, r12} stmdbge r0!, {r3, r12} subge r2, r2, #4 @@ -377,14 +394,17 @@ ENTRY(bcopy) .Lmemmove_bl4: /* less than 4 bytes to go */ adds r2, r2, #4 + it eq RETeq /* done */ /* copy the crud byte at a time */ cmp r2, #2 ldrb r3, [r1, #-1]! strb r3, [r0, #-1]! + itt ge ldrbge r3, [r1, #-1]! strbge r3, [r0, #-1]! + itt gt ldrbgt r3, [r1, #-1]! strbgt r3, [r0, #-1]! RET @@ -396,8 +416,10 @@ ENTRY(bcopy) /* align destination with byte copies */ ldrb r3, [r1, #-1]! strb r3, [r0, #-1]! + itt ge ldrbge r3, [r1, #-1]! strbge r3, [r0, #-1]! + itt gt ldrbgt r3, [r1, #-1]! strbgt r3, [r0, #-1]! subs r2, r2, r12 |
