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optimize internal putc_unlocked macro used in putc

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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.
This commit is contained in:
Rich Felker 2018-10-18 13:37:05 -04:00
parent a21a6092cf
commit d8870dcf38
1 changed files with 2 additions and 1 deletions
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3
src/internal/stdio_impl.h
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@ -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);