diff options
Diffstat (limited to 'sysdeps/arm/armv6/strcpy.S')
| -rw-r--r-- | sysdeps/arm/armv6/strcpy.S | 57 |
1 files changed, 22 insertions, 35 deletions
diff --git a/sysdeps/arm/armv6/strcpy.S b/sysdeps/arm/armv6/strcpy.S index c0484a3cf9..10c5c575ad 100644 --- a/sysdeps/arm/armv6/strcpy.S +++ b/sysdeps/arm/armv6/strcpy.S @@ -1,5 +1,5 @@ /* strcpy -- copy a nul-terminated string. - Copyright (C) 2013-2016 Free Software Foundation, Inc. + Copyright (C) 2013-2018 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -44,8 +44,8 @@ ENTRY (strcpy) @ Signal strcpy with DEST in IP. mov ip, r0 0: - sfi_pld r0 - sfi_pld r1 + pld [r0, #0] + pld [r1, #0] @ To cater to long strings, we want 8 byte alignment in the source. @ To cater to small strings, we don't want to start that right away. @@ -54,11 +54,9 @@ ENTRY (strcpy) rsb r3, r3, #16 @ Loop until we find ... -1: sfi_breg r1, \ - ldrb r2, [\B], #1 +1: ldrb r2, [r1], #1 subs r3, r3, #1 @ ... the alignment point - sfi_breg r0, \ - strb r2, [\B], #1 + strb r2, [r0], #1 it ne cmpne r2, #0 @ ... or EOS bne 1b @@ -68,10 +66,9 @@ ENTRY (strcpy) beq .Lreturn @ Load the next two words asap - sfi_breg r1, \ - ldrd r2, r3, [\B], #8 - sfi_pld r0, #64 - sfi_pld r1, #64 + ldrd r2, r3, [r1], #8 + pld [r0, #64] + pld [r1, #64] @ For longer strings, we actaully need a stack frame. push { r4, r5, r6, r7 } @@ -99,18 +96,15 @@ ENTRY (strcpy) .balign 16 2: uqsub8 r4, r7, r2 @ Find EOS uqsub8 r5, r7, r3 - sfi_pld r1, #128 + pld [r1, #128] cmp r4, #0 @ EOS in first word? - sfi_pld r0, #128 + pld [r0, #128] bne 3f - sfi_breg r0, \ - str r2, [\B], #4 + str r2, [r0], #4 cmp r5, #0 @ EOS in second word? bne 4f - sfi_breg r0, \ - str r3, [\B], #4 - sfi_breg r1, \ - ldrd r2, r3, [\B], #8 + str r3, [r0], #4 + ldrd r2, r3, [r1], #8 b 2b 3: sub r1, r1, #4 @ backup to first word @@ -120,11 +114,9 @@ ENTRY (strcpy) @ Note that we generally back up and re-read source bytes, @ but we'll not re-write dest bytes. .Lbyte_loop: - sfi_breg r1, \ - ldrb r2, [\B], #1 + ldrb r2, [r1], #1 cmp r2, #0 - sfi_breg r0, \ - strb r2, [\B], #1 + strb r2, [r0], #1 bne .Lbyte_loop pop { r4, r5, r6, r7 } @@ -169,8 +161,7 @@ ENTRY (strcpy) @ Store a few bytes from the first word. @ At the same time we align r0 and shift out bytes from r2. .rept 4-\unalign - sfi_breg r0, \ - strb r2, [\B], #1 + strb r2, [r0], #1 lsr r2, r2, #8 .endr #ifdef __ARMEB__ @@ -185,23 +176,20 @@ ENTRY (strcpy) orr r2, r2, r3, lsh_gt #(\unalign*8) @ Save leftover bytes from the two words lsh_ls r6, r3, #((4-\unalign)*8) - sfi_breg r0, \ - str r2, [\B], #4 + str r2, [r0], #4 @ The "real" start of the unaligned copy loop. - sfi_breg r1, \ - ldrd r2, r3, [\B], #8 @ Load 8 more bytes + ldrd r2, r3, [r1], #8 @ Load 8 more bytes uqsub8 r4, r7, r2 @ Find EOS - sfi_pld r1, #128 + pld [r1, #128] uqsub8 r5, r7, r3 - sfi_pld r0, #128 + pld [r0, #128] cmp r4, #0 @ EOS in first word? bne 3f @ Combine the leftover and the first word orr r6, r6, r2, lsh_gt #(\unalign*8) @ Discard used bytes from the first word. lsh_ls r2, r2, #((4-\unalign)*8) - sfi_breg r0, \ - str r6, [\B], #4 + str r6, [r0], #4 b 1b @ Found EOS in one of the words; adjust backward 3: sub r1, r1, #4 @@ -212,8 +200,7 @@ ENTRY (strcpy) rev r2, r2 #endif .rept \unalign - sfi_breg r0, \ - strb r2, [\B], #1 + strb r2, [r0], #1 lsr r2, r2, #8 .endr b .Lbyte_loop |