When f[w]printf() is called on an unbuffered file like stdout, it

sets up a fake buffered FILE and then effectively calls itself
recursively. Unfortunately, gcc doesn't know how to do tail call
elimination in this case, and actually makes things worse by
inlining __sbprintf(). This means that f[w]printf() to stderr was
allocating about 5k of stack on 64-bit platforms, much of which was
never used.

I've reorganized things to eliminate the waste. In addition to saving
some stack space, this improves performance in my tests by anywhere
from 5% to 17% (depending on the test) when -fstack-protector is
enabled. I found no statistically significant performance difference
when stack protection is turned off. (The tests redirected stderr to
/dev/null.)

1 files changed, 12 insertions, 7 deletions

diff --git a/lib/libc/stdio/vfprintf.c b/lib/libc/stdio/vfprintf.c
index 0b2d9f1..d312e7b 100644
--- a/lib/libc/stdio/vfprintf.c
+++ b/lib/libc/stdio/vfprintf.c
@@ -65,7 +65,8 @@ __FBSDID("$FreeBSD$");
 #include "printflocal.h"
 
 static int	__sprint(FILE *, struct __suio *);
-static int	__sbprintf(FILE *, const char *, va_list) __printflike(2, 0);
+static int	__sbprintf(FILE *, const char *, va_list) __printflike(2, 0)
+	__noinline;
 static char	*__wcsconv(wchar_t *, int);
 
 #define	CHAR	char
@@ -102,6 +103,10 @@ __sbprintf(FILE *fp, const char *fmt, va_list ap)
 	FILE fake;
 	unsigned char buf[BUFSIZ];
 
+	/* XXX This is probably not needed. */
+	if (prepwrite(fp) != 0)
+		return (EOF);
+
 	/* copy the important variables */
 	fake._flags = fp->_flags & ~__SNBF;
 	fake._file = fp->_file;
@@ -193,7 +198,12 @@ vfprintf(FILE * __restrict fp, const char * __restrict fmt0, va_list ap)
 	int ret;
 
 	FLOCKFILE(fp);
-	ret = __vfprintf(fp, fmt0, ap);
+	/* optimise fprintf(stderr) (and other unbuffered Unix files) */
+	if ((fp->_flags & (__SNBF|__SWR|__SRW)) == (__SNBF|__SWR) &&
+	    fp->_file >= 0)
+		ret = __sbprintf(fp, fmt0, ap);
+	else
+		ret = __vfprintf(fp, fmt0, ap);
 	FUNLOCKFILE(fp);
 	return (ret);
 }
@@ -367,11 +377,6 @@ __vfprintf(FILE *fp, const char *fmt0, va_list ap)
 	if (prepwrite(fp) != 0)
 		return (EOF);
 
-	/* optimise fprintf(stderr) (and other unbuffered Unix files) */
-	if ((fp->_flags & (__SNBF|__SWR|__SRW)) == (__SNBF|__SWR) &&
-	    fp->_file >= 0)
-		return (__sbprintf(fp, fmt0, ap));
-
 	thousands_sep = '\0';
 	grouping = NULL;
 	convbuf = NULL;