* sysdeps/ieee754/ldbl-128ibm/printf_fphex.c

(PRINT_FPHEX_LONG_DOUBLE): Fix printing numbers where lower double
	is non-zero, but smaller than 2 * __DBL_MIN__.
	* stdio-common/tst-sprintf2.c: New test.
	* stdio-common/Makefile (tests): Add tst-sprintf2.

	* math/test-misc.c (main): Don't run last batch of tests with
	IBM long double format.

ChangeLog

@@ -1,3 +1,14 @@
+2007-06-04  Jakub Jelinek  <jakub@redhat.com>
+
+	* sysdeps/ieee754/ldbl-128ibm/printf_fphex.c
+	(PRINT_FPHEX_LONG_DOUBLE): Fix printing numbers where lower double
+	is non-zero, but smaller than 2 * __DBL_MIN__.
+	* stdio-common/tst-sprintf2.c: New test.
+	* stdio-common/Makefile (tests): Add tst-sprintf2.
+
+	* math/test-misc.c (main): Don't run last batch of tests with
+	IBM long double format.
+
 2007-05-31  Steven Munroe  <sjmunroe@us.ibm.com>
 
 	* sysdeps/powerpc/powerpc32/970/fpu/Implies: New file.

math/test-misc.c

@@ -1235,7 +1235,12 @@ main (void)
     }
 #endif
 
-#if !defined NO_LONG_DOUBLE && LDBL_MANT_DIG >= DBL_MANT_DIG + 4
+/* Skip testing IBM long double format, for 2 reasons:
+   1) it only supports FE_TONEAREST
+   2) nextafter (0.0, 1.0) == nextafterl (0.0L, 1.0L), so
+      nextafter (0.0, 1.0) / 16.0L will be 0.0L.  */
+#if !defined NO_LONG_DOUBLE && LDBL_MANT_DIG >= DBL_MANT_DIG + 4 \
+    && LDBL_MANT_DIG != 106
   int oldmode = fegetround ();
   int j;
   for (j = 0; j < 4; j++)

stdio-common/Makefile

@@ -54,7 +54,7 @@ tests := tstscanf test_rdwr test-popen tstgetln test-fseek \
 	 tst-swprintf tst-fseek tst-fmemopen test-vfprintf tst-gets \
 	 tst-perror tst-sprintf tst-rndseek tst-fdopen tst-fphex bug14 bug15 \
 	 tst-popen tst-unlockedio tst-fmemopen2 tst-put-error tst-fgets \
-	 tst-fwrite bug16 bug17 tst-swscanf
+	 tst-fwrite bug16 bug17 tst-swscanf tst-sprintf2
 
 test-srcs = tst-unbputc tst-printf
 

stdio-common/tst-sprintf2.c

@@ -0,0 +1,59 @@
+#include <float.h>
+#include <math.h>
+#include <stdio.h>
+
+int
+main (void)
+{
+  volatile union { long double l; long long x[2]; } u;
+  char buf[64];
+  int result = 0;
+
+#define TEST(val) \
+  do									   \
+    {									   \
+      u.l = (val);							   \
+      snprintf (buf, sizeof buf, "%LaL", u.l);				   \
+      if (strcmp (buf, #val) != 0)					   \
+	{								   \
+	  printf ("Error on line %d: %s != %s\n", __LINE__, buf, #val);	   \
+	  result = 1;							   \
+	}								   \
+      /* printf ("%s %La %016Lx %016Lx\n", #val, u.l, u.x[0], u.x[1]); */  \
+    }									   \
+  while (0)
+
+#if LDBL_MANT_DIG >= 106
+# if LDBL_MANT_DIG == 106
+  TEST (0x0.ffffffffffffp-1022L);
+  TEST (0x0.ffffffffffff1p-1022L);
+  TEST (0x0.fffffffffffffp-1022L);
+# endif
+  TEST (0x1p-1022L);
+  TEST (0x1.0000000000001p-1022L);
+  TEST (0x1.00000000001e7p-1022L);
+  TEST (0x1.fffffffffffffp-1022L);
+  TEST (0x1p-1021L);
+  TEST (0x1.00000000000008p-1021L);
+  TEST (0x1.0000000000001p-1021L);
+  TEST (0x1.00000000000018p-1021L);
+  TEST (0x1.0000000000000f8p-1017L);
+  TEST (0x1.0000000000001p-1017L);
+  TEST (0x1.000000000000108p-1017L);
+  TEST (0x1.000000000000dcf8p-1013L);
+  TEST (0x1.000000000000ddp-1013L);
+  TEST (0x1.000000000000dd08p-1013L);
+  TEST (0x1.ffffffffffffffffffffffffffp-1L);
+  TEST (0x1.ffffffffffffffffffffffffff8p-1L);
+  TEST (0x1p+0L);
+  TEST (0x1.000000000000000000000000008p+0L);
+  TEST (0x1.00000000000000000000000001p+0L);
+  TEST (0x1.000000000000000000000000018p+0L);
+  TEST (0x1.23456789abcdef123456789abc8p+0L);
+  TEST (0x1.23456789abcde7123456789abc8p+0L);
+  TEST (0x1.23456789abcdef123456789abc8p+64L);
+  TEST (0x1.23456789abcde7123456789abc8p+64L);
+  TEST (0x1.123456789abcdef123456789p-969L);
+#endif
+  return result;
+}

sysdeps/ieee754/ldbl-128ibm/printf_fphex.c

@@ -1,5 +1,5 @@
 /* Print floating point number in hexadecimal notation according to ISO C99.
-   Copyright (C) 1997,1998,1999,2000,2001,2002,2004,2006
+   Copyright (C) 1997,1998,1999,2000,2001,2002,2004,2006,2007
 	Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
@@ -35,21 +35,24 @@ do {									      \
 									      \
       lo = ((long long)eldbl.ieee.mantissa2 << 32) | eldbl.ieee.mantissa3;    \
       hi = ((long long)eldbl.ieee.mantissa0 << 32) | eldbl.ieee.mantissa1;    \
+      lo <<= 7; /* pre-shift lo to match ieee854.  */			      \
       /* If the lower double is not a denomal or zero then set the hidden     \
 	 53rd bit.  */							      \
-      if (eldbl.ieee.exponent2 > 0x001)					      \
+      if (eldbl.ieee.exponent2 != 0)					      \
-	{								      \
+	lo |= (1ULL << (52 + 7));					      \
-	  lo |= (1ULL << 52);						      \
+      else								      \
-	  lo = lo << 7; /* pre-shift lo to match ieee854.  */		      \
+	lo <<= 1;							      \
       /* The lower double is normalized separately from the upper.  We	      \
 	 may need to adjust the lower manitissa to reflect this.  */	      \
       ediff = eldbl.ieee.exponent - eldbl.ieee.exponent2;		      \
-	  if (ediff > 53)						      \
+      if (ediff > 53 + 63)						      \
+	lo = 0;								      \
+      else if (ediff > 53)						      \
 	lo = lo >> (ediff - 53);					      \
-	}								      \
+      else if (eldbl.ieee.exponent2 == 0 && ediff < 53)			      \
-  									      \
+	lo = lo << (53 - ediff);					      \
-      if ((eldbl.ieee.negative != eldbl.ieee.negative2)			      \
+      if (eldbl.ieee.negative != eldbl.ieee.negative2			      \
-	  && ((eldbl.ieee.exponent2 != 0) && (lo != 0L)))		      \
+	  && (eldbl.ieee.exponent2 != 0 || lo != 0L))			      \
 	{								      \
 	  lo = (1ULL << 60) - lo;					      \
 	  if (hi == 0L)							      \