[PATCH v2 5/6] wcsmbs: Use loop_unroll on wcsrchr
Adhemerval Zanella
adhemerval.zanella@linaro.org
Wed Mar 13 14:03:00 GMT 2019
This allows an architecture to set explicit loop unrolling.
Checked on aarch64-linux-gnu.
* wcsmbs/wcsrchr.c (WCSRCHR): Use loop_unroll.h to parametrize
the loop unroll.
---
wcsmbs/wcsrchr.c | 22 ++++++++++++++++------
1 file changed, 16 insertions(+), 6 deletions(-)
diff --git a/wcsmbs/wcsrchr.c b/wcsmbs/wcsrchr.c
index 0d4bad0704..3175df357d 100644
--- a/wcsmbs/wcsrchr.c
+++ b/wcsmbs/wcsrchr.c
@@ -17,6 +17,7 @@
<http://www.gnu.org/licenses/>. */
#include <wchar.h>
+#include <loop_unroll.h>
#ifndef WCSRCHR
# define WCSRCHR wcsrchr
@@ -26,12 +27,21 @@
wchar_t *
WCSRCHR (const wchar_t *wcs, const wchar_t wc)
{
- const wchar_t *retval = NULL;
+ wchar_t *retval = NULL;
- do
- if (*wcs == wc)
- retval = wcs;
- while (*wcs++ != L'\0');
+#define ITERATION(index) \
+ ({ \
+ if (*wcs == wc) \
+ retval = (wchar_t*) wcs; \
+ *wcs++ != L'\0'; \
+ })
- return (wchar_t *) retval;
+#ifndef UNROLL_NTIMES
+# define UNROLL_NTIMES 1
+#endif
+
+ while (1)
+ UNROLL_REPEAT(UNROLL_NTIMES, ITERATION);
+
+ return retval;
}
--
2.17.1
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