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| author | Alexey Lapshin <alexey.lapshin@espressif.com> | 2025-01-27 10:50:36 +0000 |
|---|---|---|
| committer | Corinna Vinschen <corinna@vinschen.de> | 2025-02-10 15:33:35 +0100 |
| commit | 9a706d0479af5691f14a57a1114215c03c8d3d63 (patch) | |
| tree | 0da193474a22f873fa6e8c902dc7ee3416a950cd /newlib | |
| parent | 2a79b76c077af110ed95590a4eafbe13faff5bf9 (diff) | |
| download | newlib-9a706d0479af5691f14a57a1114215c03c8d3d63.zip newlib-9a706d0479af5691f14a57a1114215c03c8d3d63.tar.gz newlib-9a706d0479af5691f14a57a1114215c03c8d3d63.tar.bz2 | |
newlib: str[n]cat: optimize skipping of the destination string
Prepare pointer to be aligned and than use word-size iterator on aligned
memory.
Diffstat (limited to 'newlib')
| -rw-r--r-- | newlib/libc/string/strcat.c | 18 | ||||
| -rw-r--r-- | newlib/libc/string/strncat.c | 17 |
2 files changed, 18 insertions, 17 deletions
diff --git a/newlib/libc/string/strcat.c b/newlib/libc/string/strcat.c index 71dd1db..47c53a5 100644 --- a/newlib/libc/string/strcat.c +++ b/newlib/libc/string/strcat.c @@ -50,17 +50,17 @@ strcat (char *__restrict s1, #else char *s = s1; + /* Skip unaligned memory in s1. */ + while (UNALIGNED_X(s1) && *s1) + s1++; - /* Skip over the data in s1 as quickly as possible. */ - if (!UNALIGNED_X(s1)) - { - unsigned long *aligned_s1 = (unsigned long *)s1; - while (!DETECT_NULL(*aligned_s1)) - aligned_s1++; - - s1 = (char *)aligned_s1; - } + /* Skip over the aligned data in s1 as quickly as possible. */ + unsigned long *aligned_s1 = (unsigned long *)s1; + while (!DETECT_NULL(*aligned_s1)) + aligned_s1++; + s1 = (char *)aligned_s1; + /* Find string terminator. */ while (*s1) s1++; diff --git a/newlib/libc/string/strncat.c b/newlib/libc/string/strncat.c index 01f20f6..fc9fe5b 100644 --- a/newlib/libc/string/strncat.c +++ b/newlib/libc/string/strncat.c @@ -59,16 +59,17 @@ strncat (char *__restrict s1, #else char *s = s1; - /* Skip over the data in s1 as quickly as possible. */ - if (!UNALIGNED_X(s1)) - { - unsigned long *aligned_s1 = (unsigned long *)s1; - while (!DETECT_NULL(*aligned_s1)) - aligned_s1++; + /* Skip unaligned memory in s1. */ + while (UNALIGNED_X(s1) && *s1) + s1++; - s1 = (char *)aligned_s1; - } + /* Skip over the aligned data in s1 as quickly as possible. */ + unsigned long *aligned_s1 = (unsigned long *)s1; + while (!DETECT_NULL(*aligned_s1)) + aligned_s1++; + s1 = (char *)aligned_s1; + /* Find string terminator. */ while (*s1) s1++; |