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Updates for changes in the way printf() handles hex floating point

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numbers.
This commit is contained in:
David Schultz 2008-04-12 03:11:56 +00:00
parent 76303a9735
commit e058c00c40
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=178141
2 changed files with 10 additions and 9 deletions
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9
lib/libc/stdio/printf.3
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@ -549,13 +549,14 @@ to separate the mantissa and exponent.
Note that there may be multiple valid ways to represent floating-point
numbers in this hexadecimal format.
For example,
.Li 0x3.24p+0 , 0x6.48p-1
.Li 0x1.92p+1 , 0x3.24p+0 , 0x6.48p-1 ,
and
.Li 0xc.9p-2
are all equivalent.
The format chosen depends on the internal representation of the
number, but the implementation guarantees that the length of the
mantissa will be minimized.
.Fx 8.0
and later always prints finite non-zero numbers using
.Ql 1
as the digit before the hexadecimal point.
Zeroes are always represented with a mantissa of 0 (preceded by a
.Ql -
if appropriate) and an exponent of

10
tools/regression/lib/libc/stdio/test-printfloat.c
View File

@ -256,9 +256,9 @@ main(int argc, char *argv[])
testfmt("0x1.2345p-1024", "%a", 0x1.2345p-1024);
#if (LDBL_MANT_DIG == 64) && !defined(__i386__)
testfmt("0xc.90fdaa22168c234p-2", "%La", 0x3.243f6a8885a308dp0L);
testfmt("0x8p-16448", "%La", 0x1p-16445L);
testfmt("0x9.8765p-16384", "%La", 0x9.8765p-16384L);
testfmt("0x1.921fb54442d18468p+1", "%La", 0x3.243f6a8885a308dp0L);
testfmt("0x1p-16445", "%La", 0x1p-16445L);
testfmt("0x1.30ecap-16381", "%La", 0x9.8765p-16384L);
#elif (LDBL_MANT_DIG == 113)
testfmt("0x1.921fb54442d18469898cc51701b8p+1", "%La",
0x3.243f6a8885a308d313198a2e037p0L);
@ -303,8 +303,8 @@ main(int argc, char *argv[])
testfmt("0x1.23456p+0", "%.5a", 0x1.23456789abcdep0);
testfmt("0x1.234568p+0", "%.6a", 0x1.23456789abcdep0);
testfmt("-0x1.234567p+0", "%.6a", -0x1.23456689abcdep0);
testfmt("0x2.00p-1030", "%.2a", 0x1.fffp-1030);
testfmt("0x2.00p-1027", "%.2a", 0xf.fffp-1030);
testfmt("0x1.00p-1029", "%.2a", 0x1.fffp-1030);
testfmt("0x1.00p-1026", "%.2a", 0xf.fffp-1030);
testfmt("0x1.83p+0", "%.2a", 1.51);
printf("ok 11 - printfloat\n");