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| author | Rich Felker <dalias@aerifal.cx> | 2018-10-18 13:37:05 -0400 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2018-10-18 13:41:25 -0400 |
| commit | d8870dcf385a75ae8df2f8bb5bd5ee59525ed348 (patch) | |
| tree | c92f8ccffd491650b6b487156c4ddb5fec2442aa | |
| parent | a21a6092cfc0c7e7cb8c0273e5f94d54c0e0eabd (diff) | |
| download | musl-d8870dcf385a75ae8df2f8bb5bd5ee59525ed348.tar.gz musl-d8870dcf385a75ae8df2f8bb5bd5ee59525ed348.tar.bz2 musl-d8870dcf385a75ae8df2f8bb5bd5ee59525ed348.tar.xz musl-d8870dcf385a75ae8df2f8bb5bd5ee59525ed348.zip | |
optimize internal putc_unlocked macro used in putc
to check whether flush due to line buffering is needed, the int-type
character argument must be truncated to unsigned char for comparison.
if the original value is subsequently passed to __overflow, it must be
preserved, adding to register pressure. since it doesn't matter,
truncate all uses so the original value is no longer live.
| -rw-r--r-- | src/internal/stdio_impl.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/src/internal/stdio_impl.h b/src/internal/stdio_impl.h index 44497344..055ef718 100644 --- a/src/internal/stdio_impl.h +++ b/src/internal/stdio_impl.h @@ -106,7 +106,8 @@ hidden void __getopt_msg(const char *, const char *, const char *, size_t); #define putc_unlocked(c, f) \ ( (((unsigned char)(c)!=(f)->lbf && (f)->wpos!=(f)->wend)) \ - ? *(f)->wpos++ = (c) : __overflow((f),(c)) ) + ? *(f)->wpos++ = (unsigned char)(c) \ + : __overflow((f),(unsigned char)(c)) ) /* Caller-allocated FILE * operations */ hidden FILE *__fopen_rb_ca(const char *, FILE *, unsigned char *, size_t); |