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Fix exp2 errno setting on underflow (bug 16283).

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This commit is contained in:
Joseph Myers
2013-12-03 20:50:51 +00:00
parent b20de2c3d9
commit 17dea1887f
7 changed files with 103 additions and 97 deletions
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10
ChangeLog
View File

@@ -1,3 +1,13 @@
2013-12-03 Joseph Myers <joseph@codesourcery.com>
[BZ #16283]
* math/w_exp2.c (__exp2): Handle a zero result as underflow.
* math/w_exp2f.c (__exp2f): Likewise.
* math/w_exp2l.c (__exp2l): Likewise.
* math/auto-libm-test-in: Do not allow missing errno on exp2
underflow.
* math/auto-libm-test-out: Regenerated.
2013-12-03 Ondřej Bílka <neleai@seznam.cz>
[BZ #16274]

2
NEWS
View File

@@ -20,7 +20,7 @@ Version 2.19
15923, 15939, 15948, 15963, 15966, 15985, 15988, 15997, 16032, 16034,
16036, 16037, 16041, 16055, 16071, 16072, 16074, 16077, 16078, 16103,
16112, 16143, 16144, 16146, 16150, 16151, 16153, 16167, 16172, 16195,
16214, 16245, 16271, 16289.
16214, 16245, 16271, 16283, 16289.
* The public headers no longer use __unused nor __block. This change is to
support compiling programs that are derived from BSD sources and use

12
math/auto-libm-test-in
View File

@@ -203,22 +203,18 @@ exp2 -0
exp2 10
exp2 -1
exp2 1e6
# Bug 16283: errno may not be set on underflow.
exp2 -1e6 missing-errno
exp2 -1e6
exp2 max
# Bug 16283: errno may not be set on underflow.
exp2 -max missing-errno
exp2 -max
exp2 0.75
exp2 100.5
exp2 127
exp2 -149
exp2 1000.25
exp2 1023
# Bug 16283: errno may not be set on underflow.
exp2 -1074 missing-errno
exp2 -1074
exp2 16383
# Bug 16283: errno may not be set on underflow.
exp2 -16400 missing-errno
exp2 -16400
expm1 0
expm1 -0

170
math/auto-libm-test-out
View File

@@ -6725,30 +6725,30 @@ exp2 1e6
= exp2 tonearest ldbl-128ibm 0xf.424p+16L : plus_infty : inexact-ok overflow errno-erange
= exp2 towardzero ldbl-128ibm 0xf.424p+16L : 0xf.ffffffffffffbffffffffffffcp+1020L : inexact-ok overflow errno-erange-ok
= exp2 upward ldbl-128ibm 0xf.424p+16L : plus_infty : inexact-ok overflow errno-erange
exp2 -1e6 missing-errno
= exp2 downward flt-32 -0xf.424p+16f : 0x0p+0f : inexact-ok underflow errno-erange errno-erange-ok
= exp2 tonearest flt-32 -0xf.424p+16f : 0x0p+0f : inexact-ok underflow errno-erange errno-erange-ok
= exp2 towardzero flt-32 -0xf.424p+16f : 0x0p+0f : inexact-ok underflow errno-erange errno-erange-ok
exp2 -1e6
= exp2 downward flt-32 -0xf.424p+16f : 0x0p+0f : inexact-ok underflow errno-erange
= exp2 tonearest flt-32 -0xf.424p+16f : 0x0p+0f : inexact-ok underflow errno-erange
= exp2 towardzero flt-32 -0xf.424p+16f : 0x0p+0f : inexact-ok underflow errno-erange
= exp2 upward flt-32 -0xf.424p+16f : 0x8p-152f : inexact-ok underflow errno-erange-ok
= exp2 downward dbl-64 -0xf.424p+16 : 0x0p+0 : inexact-ok underflow errno-erange errno-erange-ok
= exp2 tonearest dbl-64 -0xf.424p+16 : 0x0p+0 : inexact-ok underflow errno-erange errno-erange-ok
= exp2 towardzero dbl-64 -0xf.424p+16 : 0x0p+0 : inexact-ok underflow errno-erange errno-erange-ok
= exp2 downward dbl-64 -0xf.424p+16 : 0x0p+0 : inexact-ok underflow errno-erange
= exp2 tonearest dbl-64 -0xf.424p+16 : 0x0p+0 : inexact-ok underflow errno-erange
= exp2 towardzero dbl-64 -0xf.424p+16 : 0x0p+0 : inexact-ok underflow errno-erange
= exp2 upward dbl-64 -0xf.424p+16 : 0x4p-1076 : inexact-ok underflow errno-erange-ok
= exp2 downward ldbl-96-intel -0xf.424p+16L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 tonearest ldbl-96-intel -0xf.424p+16L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 towardzero ldbl-96-intel -0xf.424p+16L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 downward ldbl-96-intel -0xf.424p+16L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 tonearest ldbl-96-intel -0xf.424p+16L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 towardzero ldbl-96-intel -0xf.424p+16L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 upward ldbl-96-intel -0xf.424p+16L : 0x8p-16448L : inexact-ok underflow errno-erange-ok
= exp2 downward ldbl-96-m68k -0xf.424p+16L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 tonearest ldbl-96-m68k -0xf.424p+16L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 towardzero ldbl-96-m68k -0xf.424p+16L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 downward ldbl-96-m68k -0xf.424p+16L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 tonearest ldbl-96-m68k -0xf.424p+16L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 towardzero ldbl-96-m68k -0xf.424p+16L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 upward ldbl-96-m68k -0xf.424p+16L : 0x4p-16448L : inexact-ok underflow errno-erange-ok
= exp2 downward ldbl-128 -0xf.424p+16L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 tonearest ldbl-128 -0xf.424p+16L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 towardzero ldbl-128 -0xf.424p+16L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 downward ldbl-128 -0xf.424p+16L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 tonearest ldbl-128 -0xf.424p+16L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 towardzero ldbl-128 -0xf.424p+16L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 upward ldbl-128 -0xf.424p+16L : 0x4p-16496L : inexact-ok underflow errno-erange-ok
= exp2 downward ldbl-128ibm -0xf.424p+16L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 tonearest ldbl-128ibm -0xf.424p+16L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 towardzero ldbl-128ibm -0xf.424p+16L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 downward ldbl-128ibm -0xf.424p+16L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 tonearest ldbl-128ibm -0xf.424p+16L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 towardzero ldbl-128ibm -0xf.424p+16L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 upward ldbl-128ibm -0xf.424p+16L : 0x4p-1076L : inexact-ok underflow errno-erange-ok
exp2 max
= exp2 downward flt-32 0xf.fffffp+124f : 0xf.fffffp+124f : inexact-ok overflow errno-erange-ok
@@ -6819,74 +6819,74 @@ exp2 max
= exp2 tonearest ldbl-128ibm 0xf.ffffffffffffbffffffffffffcp+1020L : plus_infty : inexact-ok overflow errno-erange
= exp2 towardzero ldbl-128ibm 0xf.ffffffffffffbffffffffffffcp+1020L : 0xf.ffffffffffffbffffffffffffcp+1020L : inexact-ok overflow errno-erange-ok
= exp2 upward ldbl-128ibm 0xf.ffffffffffffbffffffffffffcp+1020L : plus_infty : inexact-ok overflow errno-erange
exp2 -max missing-errno
= exp2 downward flt-32 -0xf.fffffp+124f : 0x0p+0f : inexact-ok underflow errno-erange errno-erange-ok
= exp2 tonearest flt-32 -0xf.fffffp+124f : 0x0p+0f : inexact-ok underflow errno-erange errno-erange-ok
= exp2 towardzero flt-32 -0xf.fffffp+124f : 0x0p+0f : inexact-ok underflow errno-erange errno-erange-ok
exp2 -max
= exp2 downward flt-32 -0xf.fffffp+124f : 0x0p+0f : inexact-ok underflow errno-erange
= exp2 tonearest flt-32 -0xf.fffffp+124f : 0x0p+0f : inexact-ok underflow errno-erange
= exp2 towardzero flt-32 -0xf.fffffp+124f : 0x0p+0f : inexact-ok underflow errno-erange
= exp2 upward flt-32 -0xf.fffffp+124f : 0x8p-152f : inexact-ok underflow errno-erange-ok
= exp2 downward dbl-64 -0xf.fffffp+124 : 0x0p+0 : inexact-ok underflow errno-erange errno-erange-ok
= exp2 tonearest dbl-64 -0xf.fffffp+124 : 0x0p+0 : inexact-ok underflow errno-erange errno-erange-ok
= exp2 towardzero dbl-64 -0xf.fffffp+124 : 0x0p+0 : inexact-ok underflow errno-erange errno-erange-ok
= exp2 downward dbl-64 -0xf.fffffp+124 : 0x0p+0 : inexact-ok underflow errno-erange
= exp2 tonearest dbl-64 -0xf.fffffp+124 : 0x0p+0 : inexact-ok underflow errno-erange
= exp2 towardzero dbl-64 -0xf.fffffp+124 : 0x0p+0 : inexact-ok underflow errno-erange
= exp2 upward dbl-64 -0xf.fffffp+124 : 0x4p-1076 : inexact-ok underflow errno-erange-ok
= exp2 downward ldbl-96-intel -0xf.fffffp+124L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 tonearest ldbl-96-intel -0xf.fffffp+124L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 towardzero ldbl-96-intel -0xf.fffffp+124L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 downward ldbl-96-intel -0xf.fffffp+124L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 tonearest ldbl-96-intel -0xf.fffffp+124L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 towardzero ldbl-96-intel -0xf.fffffp+124L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 upward ldbl-96-intel -0xf.fffffp+124L : 0x8p-16448L : inexact-ok underflow errno-erange-ok
= exp2 downward ldbl-96-m68k -0xf.fffffp+124L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 tonearest ldbl-96-m68k -0xf.fffffp+124L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 towardzero ldbl-96-m68k -0xf.fffffp+124L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 downward ldbl-96-m68k -0xf.fffffp+124L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 tonearest ldbl-96-m68k -0xf.fffffp+124L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 towardzero ldbl-96-m68k -0xf.fffffp+124L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 upward ldbl-96-m68k -0xf.fffffp+124L : 0x4p-16448L : inexact-ok underflow errno-erange-ok
= exp2 downward ldbl-128 -0xf.fffffp+124L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 tonearest ldbl-128 -0xf.fffffp+124L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 towardzero ldbl-128 -0xf.fffffp+124L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 downward ldbl-128 -0xf.fffffp+124L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 tonearest ldbl-128 -0xf.fffffp+124L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 towardzero ldbl-128 -0xf.fffffp+124L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 upward ldbl-128 -0xf.fffffp+124L : 0x4p-16496L : inexact-ok underflow errno-erange-ok
= exp2 downward ldbl-128ibm -0xf.fffffp+124L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 tonearest ldbl-128ibm -0xf.fffffp+124L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 towardzero ldbl-128ibm -0xf.fffffp+124L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 downward ldbl-128ibm -0xf.fffffp+124L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 tonearest ldbl-128ibm -0xf.fffffp+124L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 towardzero ldbl-128ibm -0xf.fffffp+124L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 upward ldbl-128ibm -0xf.fffffp+124L : 0x4p-1076L : inexact-ok underflow errno-erange-ok
= exp2 downward dbl-64 -0xf.ffffffffffff8p+1020 : 0x0p+0 : inexact-ok underflow errno-erange errno-erange-ok
= exp2 tonearest dbl-64 -0xf.ffffffffffff8p+1020 : 0x0p+0 : inexact-ok underflow errno-erange errno-erange-ok
= exp2 towardzero dbl-64 -0xf.ffffffffffff8p+1020 : 0x0p+0 : inexact-ok underflow errno-erange errno-erange-ok
= exp2 downward dbl-64 -0xf.ffffffffffff8p+1020 : 0x0p+0 : inexact-ok underflow errno-erange
= exp2 tonearest dbl-64 -0xf.ffffffffffff8p+1020 : 0x0p+0 : inexact-ok underflow errno-erange
= exp2 towardzero dbl-64 -0xf.ffffffffffff8p+1020 : 0x0p+0 : inexact-ok underflow errno-erange
= exp2 upward dbl-64 -0xf.ffffffffffff8p+1020 : 0x4p-1076 : inexact-ok underflow errno-erange-ok
= exp2 downward ldbl-96-intel -0xf.ffffffffffff8p+1020L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 tonearest ldbl-96-intel -0xf.ffffffffffff8p+1020L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 towardzero ldbl-96-intel -0xf.ffffffffffff8p+1020L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 downward ldbl-96-intel -0xf.ffffffffffff8p+1020L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 tonearest ldbl-96-intel -0xf.ffffffffffff8p+1020L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 towardzero ldbl-96-intel -0xf.ffffffffffff8p+1020L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 upward ldbl-96-intel -0xf.ffffffffffff8p+1020L : 0x8p-16448L : inexact-ok underflow errno-erange-ok
= exp2 downward ldbl-96-m68k -0xf.ffffffffffff8p+1020L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 tonearest ldbl-96-m68k -0xf.ffffffffffff8p+1020L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 towardzero ldbl-96-m68k -0xf.ffffffffffff8p+1020L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 downward ldbl-96-m68k -0xf.ffffffffffff8p+1020L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 tonearest ldbl-96-m68k -0xf.ffffffffffff8p+1020L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 towardzero ldbl-96-m68k -0xf.ffffffffffff8p+1020L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 upward ldbl-96-m68k -0xf.ffffffffffff8p+1020L : 0x4p-16448L : inexact-ok underflow errno-erange-ok
= exp2 downward ldbl-128 -0xf.ffffffffffff8p+1020L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 tonearest ldbl-128 -0xf.ffffffffffff8p+1020L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 towardzero ldbl-128 -0xf.ffffffffffff8p+1020L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 downward ldbl-128 -0xf.ffffffffffff8p+1020L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 tonearest ldbl-128 -0xf.ffffffffffff8p+1020L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 towardzero ldbl-128 -0xf.ffffffffffff8p+1020L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 upward ldbl-128 -0xf.ffffffffffff8p+1020L : 0x4p-16496L : inexact-ok underflow errno-erange-ok
= exp2 downward ldbl-128ibm -0xf.ffffffffffff8p+1020L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 tonearest ldbl-128ibm -0xf.ffffffffffff8p+1020L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 towardzero ldbl-128ibm -0xf.ffffffffffff8p+1020L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 downward ldbl-128ibm -0xf.ffffffffffff8p+1020L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 tonearest ldbl-128ibm -0xf.ffffffffffff8p+1020L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 towardzero ldbl-128ibm -0xf.ffffffffffff8p+1020L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 upward ldbl-128ibm -0xf.ffffffffffff8p+1020L : 0x4p-1076L : inexact-ok underflow errno-erange-ok
= exp2 downward ldbl-96-intel -0xf.fffffffffffffffp+16380L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 tonearest ldbl-96-intel -0xf.fffffffffffffffp+16380L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 towardzero ldbl-96-intel -0xf.fffffffffffffffp+16380L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 downward ldbl-96-intel -0xf.fffffffffffffffp+16380L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 tonearest ldbl-96-intel -0xf.fffffffffffffffp+16380L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 towardzero ldbl-96-intel -0xf.fffffffffffffffp+16380L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 upward ldbl-96-intel -0xf.fffffffffffffffp+16380L : 0x8p-16448L : inexact-ok underflow errno-erange-ok
= exp2 downward ldbl-96-m68k -0xf.fffffffffffffffp+16380L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 tonearest ldbl-96-m68k -0xf.fffffffffffffffp+16380L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 towardzero ldbl-96-m68k -0xf.fffffffffffffffp+16380L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 downward ldbl-96-m68k -0xf.fffffffffffffffp+16380L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 tonearest ldbl-96-m68k -0xf.fffffffffffffffp+16380L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 towardzero ldbl-96-m68k -0xf.fffffffffffffffp+16380L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 upward ldbl-96-m68k -0xf.fffffffffffffffp+16380L : 0x4p-16448L : inexact-ok underflow errno-erange-ok
= exp2 downward ldbl-128 -0xf.fffffffffffffffp+16380L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 tonearest ldbl-128 -0xf.fffffffffffffffp+16380L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 towardzero ldbl-128 -0xf.fffffffffffffffp+16380L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 downward ldbl-128 -0xf.fffffffffffffffp+16380L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 tonearest ldbl-128 -0xf.fffffffffffffffp+16380L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 towardzero ldbl-128 -0xf.fffffffffffffffp+16380L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 upward ldbl-128 -0xf.fffffffffffffffp+16380L : 0x4p-16496L : inexact-ok underflow errno-erange-ok
= exp2 downward ldbl-128 -0xf.fffffffffffffffffffffffffff8p+16380L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 tonearest ldbl-128 -0xf.fffffffffffffffffffffffffff8p+16380L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 towardzero ldbl-128 -0xf.fffffffffffffffffffffffffff8p+16380L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 downward ldbl-128 -0xf.fffffffffffffffffffffffffff8p+16380L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 tonearest ldbl-128 -0xf.fffffffffffffffffffffffffff8p+16380L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 towardzero ldbl-128 -0xf.fffffffffffffffffffffffffff8p+16380L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 upward ldbl-128 -0xf.fffffffffffffffffffffffffff8p+16380L : 0x4p-16496L : inexact-ok underflow errno-erange-ok
= exp2 downward ldbl-128 -0xf.ffffffffffffbffffffffffffcp+1020L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 tonearest ldbl-128 -0xf.ffffffffffffbffffffffffffcp+1020L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 towardzero ldbl-128 -0xf.ffffffffffffbffffffffffffcp+1020L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 downward ldbl-128 -0xf.ffffffffffffbffffffffffffcp+1020L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 tonearest ldbl-128 -0xf.ffffffffffffbffffffffffffcp+1020L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 towardzero ldbl-128 -0xf.ffffffffffffbffffffffffffcp+1020L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 upward ldbl-128 -0xf.ffffffffffffbffffffffffffcp+1020L : 0x4p-16496L : inexact-ok underflow errno-erange-ok
= exp2 downward ldbl-128ibm -0xf.ffffffffffffbffffffffffffcp+1020L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 tonearest ldbl-128ibm -0xf.ffffffffffffbffffffffffffcp+1020L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 towardzero ldbl-128ibm -0xf.ffffffffffffbffffffffffffcp+1020L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 downward ldbl-128ibm -0xf.ffffffffffffbffffffffffffcp+1020L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 tonearest ldbl-128ibm -0xf.ffffffffffffbffffffffffffcp+1020L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 towardzero ldbl-128ibm -0xf.ffffffffffffbffffffffffffcp+1020L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 upward ldbl-128ibm -0xf.ffffffffffffbffffffffffffcp+1020L : 0x4p-1076L : inexact-ok underflow errno-erange-ok
exp2 0.75
= exp2 downward flt-32 0xcp-4f : 0x1.ae89f8p+0f : inexact-ok
@@ -7038,10 +7038,10 @@ exp2 1023
= exp2 tonearest ldbl-128ibm 0x3.ffp+8L : 0x8p+1020L : inexact-ok
= exp2 towardzero ldbl-128ibm 0x3.ffp+8L : 0x8p+1020L : inexact-ok
= exp2 upward ldbl-128ibm 0x3.ffp+8L : 0x8p+1020L : inexact-ok
exp2 -1074 missing-errno
= exp2 downward flt-32 -0x4.32p+8f : 0x0p+0f : inexact-ok underflow errno-erange errno-erange-ok
= exp2 tonearest flt-32 -0x4.32p+8f : 0x0p+0f : inexact-ok underflow errno-erange errno-erange-ok
= exp2 towardzero flt-32 -0x4.32p+8f : 0x0p+0f : inexact-ok underflow errno-erange errno-erange-ok
exp2 -1074
= exp2 downward flt-32 -0x4.32p+8f : 0x0p+0f : inexact-ok underflow errno-erange
= exp2 tonearest flt-32 -0x4.32p+8f : 0x0p+0f : inexact-ok underflow errno-erange
= exp2 towardzero flt-32 -0x4.32p+8f : 0x0p+0f : inexact-ok underflow errno-erange
= exp2 upward flt-32 -0x4.32p+8f : 0x8p-152f : inexact-ok underflow errno-erange-ok
= exp2 downward dbl-64 -0x4.32p+8 : 0x4p-1076 : inexact-ok underflow-ok errno-erange-ok
= exp2 tonearest dbl-64 -0x4.32p+8 : 0x4p-1076 : inexact-ok underflow-ok errno-erange-ok
@@ -7088,14 +7088,14 @@ exp2 16383
= exp2 tonearest ldbl-128ibm 0x3.fffp+12L : plus_infty : inexact-ok overflow errno-erange
= exp2 towardzero ldbl-128ibm 0x3.fffp+12L : 0xf.ffffffffffffbffffffffffffcp+1020L : inexact-ok overflow errno-erange-ok
= exp2 upward ldbl-128ibm 0x3.fffp+12L : plus_infty : inexact-ok overflow errno-erange
exp2 -16400 missing-errno
= exp2 downward flt-32 -0x4.01p+12f : 0x0p+0f : inexact-ok underflow errno-erange errno-erange-ok
= exp2 tonearest flt-32 -0x4.01p+12f : 0x0p+0f : inexact-ok underflow errno-erange errno-erange-ok
= exp2 towardzero flt-32 -0x4.01p+12f : 0x0p+0f : inexact-ok underflow errno-erange errno-erange-ok
exp2 -16400
= exp2 downward flt-32 -0x4.01p+12f : 0x0p+0f : inexact-ok underflow errno-erange
= exp2 tonearest flt-32 -0x4.01p+12f : 0x0p+0f : inexact-ok underflow errno-erange
= exp2 towardzero flt-32 -0x4.01p+12f : 0x0p+0f : inexact-ok underflow errno-erange
= exp2 upward flt-32 -0x4.01p+12f : 0x8p-152f : inexact-ok underflow errno-erange-ok
= exp2 downward dbl-64 -0x4.01p+12 : 0x0p+0 : inexact-ok underflow errno-erange errno-erange-ok
= exp2 tonearest dbl-64 -0x4.01p+12 : 0x0p+0 : inexact-ok underflow errno-erange errno-erange-ok
= exp2 towardzero dbl-64 -0x4.01p+12 : 0x0p+0 : inexact-ok underflow errno-erange errno-erange-ok
= exp2 downward dbl-64 -0x4.01p+12 : 0x0p+0 : inexact-ok underflow errno-erange
= exp2 tonearest dbl-64 -0x4.01p+12 : 0x0p+0 : inexact-ok underflow errno-erange
= exp2 towardzero dbl-64 -0x4.01p+12 : 0x0p+0 : inexact-ok underflow errno-erange
= exp2 upward dbl-64 -0x4.01p+12 : 0x4p-1076 : inexact-ok underflow errno-erange-ok
= exp2 downward ldbl-96-intel -0x4.01p+12L : 0x1p-16400L : inexact-ok underflow-ok errno-erange-ok
= exp2 tonearest ldbl-96-intel -0x4.01p+12L : 0x1p-16400L : inexact-ok underflow-ok errno-erange-ok
@@ -7109,9 +7109,9 @@ exp2 -16400 missing-errno
= exp2 tonearest ldbl-128 -0x4.01p+12L : 0x1p-16400L : inexact-ok underflow-ok errno-erange-ok
= exp2 towardzero ldbl-128 -0x4.01p+12L : 0x1p-16400L : inexact-ok underflow-ok errno-erange-ok
= exp2 upward ldbl-128 -0x4.01p+12L : 0x1p-16400L : inexact-ok underflow-ok errno-erange-ok
= exp2 downward ldbl-128ibm -0x4.01p+12L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 tonearest ldbl-128ibm -0x4.01p+12L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 towardzero ldbl-128ibm -0x4.01p+12L : 0x0p+0L : inexact-ok underflow errno-erange errno-erange-ok
= exp2 downward ldbl-128ibm -0x4.01p+12L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 tonearest ldbl-128ibm -0x4.01p+12L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 towardzero ldbl-128ibm -0x4.01p+12L : 0x0p+0L : inexact-ok underflow errno-erange
= exp2 upward ldbl-128ibm -0x4.01p+12L : 0x4p-1076L : inexact-ok underflow errno-erange-ok
expm1 0
= expm1 downward flt-32 0x0p+0f : 0x0p+0f : inexact-ok

2
math/w_exp2.c
View File

@@ -9,7 +9,7 @@ double
__exp2 (double x)
{
double z = __ieee754_exp2 (x);
if (__builtin_expect (!__finite (z), 0)
if (__builtin_expect (!__finite (z) || z == 0, 0)
&& __finite (x) && _LIB_VERSION != _IEEE_)
/* exp2 overflow: 44, exp2 underflow: 45 */
return __kernel_standard (x, x, 44 + !!__signbit (x));

2
math/w_exp2f.c
View File

@@ -9,7 +9,7 @@ float
__exp2f (float x)
{
float z = __ieee754_exp2f (x);
if (__builtin_expect (!__finitef (z), 0)
if (__builtin_expect (!__finitef (z) || z == 0, 0)
&& __finitef (x) && _LIB_VERSION != _IEEE_)
/* exp2 overflow: 144, exp2 underflow: 145 */
return __kernel_standard_f (x, x, 144 + !!__signbitf (x));

2
math/w_exp2l.c
View File

@@ -9,7 +9,7 @@ long double
__exp2l (long double x)
{
long double z = __ieee754_exp2l (x);
if (__builtin_expect (!__finitel (z), 0)
if (__builtin_expect (!__finitel (z) || z == 0, 0)
&& __finitel (x) && _LIB_VERSION != _IEEE_)
/* exp2 overflow: 244, exp2 underflow: 245 */
return __kernel_standard_l (x, x, 244 + !!__signbitl (x));