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Fix pow missing underflows (bug 18825).
Similar to various other bugs in this area, pow functions can fail to raise the underflow exception when the result is tiny and inexact but one or more low bits of the intermediate result that is scaled down (or, in the i386 case, converted from a wider evaluation format) are zero. This patch forces the exception in a similar way to previous fixes, thereby concluding the fixes for known bugs with missing underflow exceptions currently filed in Bugzilla. Tested for x86_64, x86, mips64 and powerpc. [BZ #18825] * sysdeps/i386/fpu/i386-math-asm.h (FLT_NARROW_EVAL_UFLOW_NONNAN): New macro. (DBL_NARROW_EVAL_UFLOW_NONNAN): Likewise. (LDBL_CHECK_FORCE_UFLOW_NONNAN): Likewise. * sysdeps/i386/fpu/e_pow.S: Use DEFINE_DBL_MIN. (__ieee754_pow): Use DBL_NARROW_EVAL_UFLOW_NONNAN instead of DBL_NARROW_EVAL, reloading the PIC register as needed. * sysdeps/i386/fpu/e_powf.S: Use DEFINE_FLT_MIN. (__ieee754_powf): Use FLT_NARROW_EVAL_UFLOW_NONNAN instead of FLT_NARROW_EVAL. Use separate return path for case when first argument is NaN. * sysdeps/i386/fpu/e_powl.S: Include <i386-math-asm.h>. Use DEFINE_LDBL_MIN. (__ieee754_powl): Use LDBL_CHECK_FORCE_UFLOW_NONNAN, reloading the PIC register. * sysdeps/ieee754/dbl-64/e_pow.c (__ieee754_pow): Use math_check_force_underflow_nonneg. * sysdeps/ieee754/flt-32/e_powf.c (__ieee754_powf): Force underflow for subnormal result. * sysdeps/ieee754/ldbl-128/e_powl.c (__ieee754_powl): Likewise. * sysdeps/ieee754/ldbl-128ibm/e_powl.c (__ieee754_powl): Use math_check_force_underflow_nonneg. * sysdeps/x86/fpu/powl_helper.c (__powl_helper): Use math_check_force_underflow. * sysdeps/x86_64/fpu/x86_64-math-asm.h (LDBL_CHECK_FORCE_UFLOW_NONNAN): New macro. * sysdeps/x86_64/fpu/e_powl.S: Include <x86_64-math-asm.h>. Use DEFINE_LDBL_MIN. (__ieee754_powl): Use LDBL_CHECK_FORCE_UFLOW_NONNAN. * math/auto-libm-test-in: Add more tests of pow. * math/auto-libm-test-out: Regenerated.
This commit is contained in:
Joseph Myers
parent
5a9af6376d
commit
6ace393821
35
ChangeLog
35
ChangeLog
@ -1,3 +1,38 @@
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2015-09-25 Joseph Myers <joseph@codesourcery.com>
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[BZ #18825]
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* sysdeps/i386/fpu/i386-math-asm.h (FLT_NARROW_EVAL_UFLOW_NONNAN):
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New macro.
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(DBL_NARROW_EVAL_UFLOW_NONNAN): Likewise.
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(LDBL_CHECK_FORCE_UFLOW_NONNAN): Likewise.
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* sysdeps/i386/fpu/e_pow.S: Use DEFINE_DBL_MIN.
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(__ieee754_pow): Use DBL_NARROW_EVAL_UFLOW_NONNAN instead of
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DBL_NARROW_EVAL, reloading the PIC register as needed.
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* sysdeps/i386/fpu/e_powf.S: Use DEFINE_FLT_MIN.
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(__ieee754_powf): Use FLT_NARROW_EVAL_UFLOW_NONNAN instead of
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FLT_NARROW_EVAL. Use separate return path for case when first
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argument is NaN.
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* sysdeps/i386/fpu/e_powl.S: Include <i386-math-asm.h>. Use
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DEFINE_LDBL_MIN.
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(__ieee754_powl): Use LDBL_CHECK_FORCE_UFLOW_NONNAN, reloading the
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PIC register.
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* sysdeps/ieee754/dbl-64/e_pow.c (__ieee754_pow): Use
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math_check_force_underflow_nonneg.
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* sysdeps/ieee754/flt-32/e_powf.c (__ieee754_powf): Force
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underflow for subnormal result.
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* sysdeps/ieee754/ldbl-128/e_powl.c (__ieee754_powl): Likewise.
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* sysdeps/ieee754/ldbl-128ibm/e_powl.c (__ieee754_powl): Use
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math_check_force_underflow_nonneg.
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* sysdeps/x86/fpu/powl_helper.c (__powl_helper): Use
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math_check_force_underflow.
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* sysdeps/x86_64/fpu/x86_64-math-asm.h
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(LDBL_CHECK_FORCE_UFLOW_NONNAN): New macro.
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* sysdeps/x86_64/fpu/e_powl.S: Include <x86_64-math-asm.h>. Use
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DEFINE_LDBL_MIN.
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(__ieee754_powl): Use LDBL_CHECK_FORCE_UFLOW_NONNAN.
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* math/auto-libm-test-in: Add more tests of pow.
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* math/auto-libm-test-out: Regenerated.
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2015-09-25 Florian Weimer <fweimer@redhat.com>
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* nss/bug17079.c (init_test_items): Add diagnostic for
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6
NEWS
6
NEWS
@ -14,9 +14,9 @@ Version 2.23
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16985, 17118, 17243, 17244, 17250, 17441, 17787, 17886, 17887, 17905,
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18084, 18086, 18240, 18265, 18370, 18421, 18480, 18525, 18595, 18610,
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18618, 18647, 18661, 18674, 18675, 18681, 18757, 18778, 18781, 18787,
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18789, 18790, 18795, 18796, 18803, 18820, 18823, 18824, 18857, 18863,
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18870, 18872, 18873, 18875, 18887, 18921, 18951, 18952, 18961, 18966,
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18967, 18970, 18977, 18980, 18981, 19003.
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18789, 18790, 18795, 18796, 18803, 18820, 18823, 18824, 18825, 18857,
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18863, 18870, 18872, 18873, 18875, 18887, 18921, 18951, 18952, 18961,
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18966, 18967, 18970, 18977, 18980, 18981, 19003.
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* The obsolete header <regexp.h> has been removed. Programs that require
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this header must be updated to use <regex.h> instead.
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@ -3067,6 +3067,151 @@ pow 1.01 -min_subnorm
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pow 2.0 -100000.0
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pow 2 -126.125
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pow 2 -126.25
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pow 2 -126.375
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pow 2 -126.5
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pow 2 -126.625
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pow 2 -126.75
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pow 2 -126.875
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pow 2 -969.125
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pow 2 -969.25
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pow 2 -969.375
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pow 2 -969.5
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pow 2 -969.625
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pow 2 -969.75
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pow 2 -969.875
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pow 2 -1022.125
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pow 2 -1022.25
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pow 2 -1022.375
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pow 2 -1022.5
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pow 2 -1022.625
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pow 2 -1022.75
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pow 2 -1022.875
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pow 2 -16382.125
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pow 2 -16382.25
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pow 2 -16382.375
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pow 2 -16382.5
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pow 2 -16382.625
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pow 2 -16382.75
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pow 2 -16382.875
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pow 2 -16383.125
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pow 2 -16383.25
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pow 2 -16383.375
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pow 2 -16383.5
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pow 2 -16383.625
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pow 2 -16383.75
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pow 2 -16383.875
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pow 0.5 126.125
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pow 0.5 126.25
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pow 0.5 126.375
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pow 0.5 126.5
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pow 0.5 126.625
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pow 0.5 126.75
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pow 0.5 126.875
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pow 0.5 969.125
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pow 0.5 969.25
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pow 0.5 969.375
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pow 0.5 969.5
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pow 0.5 969.625
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pow 0.5 969.75
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pow 0.5 969.875
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pow 0.5 1022.125
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pow 0.5 1022.25
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pow 0.5 1022.375
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pow 0.5 1022.5
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pow 0.5 1022.625
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pow 0.5 1022.75
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pow 0.5 1022.875
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pow 0.5 16382.125
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pow 0.5 16382.25
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pow 0.5 16382.375
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pow 0.5 16382.5
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pow 0.5 16382.625
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pow 0.5 16382.75
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pow 0.5 16382.875
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pow 0.5 16383.125
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pow 0.5 16383.25
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pow 0.5 16383.375
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pow 0.5 16383.5
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pow 0.5 16383.625
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pow 0.5 16383.75
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pow 0.5 16383.875
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pow 0x1.00001p1 -126
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pow -0x1.00002p1 -126
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pow 0x1.00003p1 -126
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pow -0x1.00004p1 -126
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pow 0x1.00005p1 -126
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pow -0x1.00006p1 -126
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pow 0x1.00007p1 -126
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pow 0x1.00001p1 -969
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pow -0x1.00002p1 -969
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pow 0x1.00003p1 -969
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pow -0x1.00004p1 -969
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pow 0x1.00005p1 -969
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pow -0x1.00006p1 -969
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pow 0x1.00007p1 -969
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pow 0x1.00001p1 -1022
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pow -0x1.00002p1 -1022
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pow 0x1.00003p1 -1022
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pow -0x1.00004p1 -1022
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pow 0x1.00005p1 -1022
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pow -0x1.00006p1 -1022
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pow 0x1.00007p1 -1022
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pow 0x1.00001p1 -16382
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pow -0x1.00002p1 -16382
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pow 0x1.00003p1 -16382
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pow -0x1.00004p1 -16382
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pow 0x1.00005p1 -16382
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pow -0x1.00006p1 -16382
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pow 0x1.00007p1 -16382
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pow 0x1.00001p1 -16383
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pow -0x1.00002p1 -16383
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pow 0x1.00003p1 -16383
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pow -0x1.00004p1 -16383
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pow 0x1.00005p1 -16383
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pow -0x1.00006p1 -16383
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pow 0x1.00007p1 -16383
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pow 0x0.ffff1p-1 126
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pow -0x0.ffff2p-1 126
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pow 0x0.ffff3p-1 126
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pow -0x0.ffff4p-1 126
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pow 0x0.ffff5p-1 126
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pow -0x0.ffff6p-1 126
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pow 0x0.ffff7p-1 126
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pow 0x0.ffff1p-1 969
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pow -0x0.ffff2p-1 969
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pow 0x0.ffff3p-1 969
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pow -0x0.ffff4p-1 969
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pow 0x0.ffff5p-1 969
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pow -0x0.ffff6p-1 969
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pow 0x0.ffff7p-1 969
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pow 0x0.ffff1p-1 1022
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pow -0x0.ffff2p-1 1022
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pow 0x0.ffff3p-1 1022
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pow -0x0.ffff4p-1 1022
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pow 0x0.ffff5p-1 1022
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pow -0x0.ffff6p-1 1022
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pow 0x0.ffff7p-1 1022
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pow 0x0.ffff1p-1 16382
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pow -0x0.ffff2p-1 16382
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pow 0x0.ffff3p-1 16382
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pow -0x0.ffff4p-1 16382
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pow 0x0.ffff5p-1 16382
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pow -0x0.ffff6p-1 16382
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pow 0x0.ffff7p-1 16382
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pow 0x0.ffff1p-1 16383
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pow -0x0.ffff2p-1 16383
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pow 0x0.ffff3p-1 16383
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pow -0x0.ffff4p-1 16383
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pow 0x0.ffff5p-1 16383
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pow -0x0.ffff6p-1 16383
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pow 0x0.ffff7p-1 16383
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pow 0x2.000b3p0 -1022
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pow 0x2.000582p0 -1022
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pow 2 -0x3.fe513p+8
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pow 2 -0x3.fe4e8p+8
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pow 1.0625 1.125
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pow 1.5 1.03125
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pow 0x1.7d1a0a6f2p+681 1.5
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File diff suppressed because it is too large
Load Diff
@ -54,6 +54,7 @@ minfinity:
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mzero:
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.byte 0, 0, 0, 0, 0, 0, 0, 0x80
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ASM_SIZE_DIRECTIVE(minf_mzero)
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DEFINE_DBL_MIN
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#ifdef PIC
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# define MO(op) op##@GOTOFF(%ecx)
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@ -166,7 +167,10 @@ ENTRY(__ieee754_pow)
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orl %edx, %ecx
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jnz 6b
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fstp %st(0) // ST*x
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DBL_NARROW_EVAL
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#ifdef PIC
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LOAD_PIC_REG (cx)
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#endif
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DBL_NARROW_EVAL_UFLOW_NONNAN
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ret
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/* y is ±NAN */
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@ -259,7 +263,7 @@ ENTRY(__ieee754_pow)
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cfi_adjust_cfa_offset (-8)
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292: fscale // +/- 2^fract(y*log2(x))*2^int(y*log2(x)) : int(y*log2(x))
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fstp %st(1) // +/- 2^fract(y*log2(x))*2^int(y*log2(x))
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DBL_NARROW_EVAL
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DBL_NARROW_EVAL_UFLOW_NONNAN
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ret
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@ -51,6 +51,7 @@ minfinity:
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mzero:
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.byte 0, 0, 0, 0, 0, 0, 0, 0x80
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ASM_SIZE_DIRECTIVE(minf_mzero)
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DEFINE_FLT_MIN
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#ifdef PIC
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# define MO(op) op##@GOTOFF(%ecx)
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@ -97,7 +98,7 @@ ENTRY(__ieee754_powf)
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je 15f // x is ±inf
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cmpb $0x01, %ah
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je 32f // x is NaN
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je 33f // x is NaN
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fxch // y : x
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@ -149,7 +150,7 @@ ENTRY(__ieee754_powf)
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testl %edx, %edx
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jnz 6b
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fstp %st(0) // ST*x
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FLT_NARROW_EVAL
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FLT_NARROW_EVAL_UFLOW_NONNAN
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ret
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/* y is ±NAN */
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@ -198,9 +199,15 @@ ENTRY(__ieee754_powf)
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32: addl $4, %esp
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cfi_adjust_cfa_offset (-4)
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fstp %st(1) // 2^fract(y*log2(x))*2^int(y*log2(x))
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FLT_NARROW_EVAL
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FLT_NARROW_EVAL_UFLOW_NONNAN
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ret
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/* x is NaN. */
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cfi_adjust_cfa_offset (4)
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33: addl $4, %esp
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cfi_adjust_cfa_offset (-4)
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fstp %st(1)
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ret
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// pow(x,±0) = 1
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.align ALIGNARG(4)
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@ -18,6 +18,7 @@
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<http://www.gnu.org/licenses/>. */
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#include <machine/asm.h>
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#include <i386-math-asm.h>
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.section .rodata.cst8,"aM",@progbits,8
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@ -59,6 +60,7 @@ minfinity:
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mzero:
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.byte 0, 0, 0, 0, 0, 0, 0, 0x80
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ASM_SIZE_DIRECTIVE(minf_mzero)
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DEFINE_LDBL_MIN
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#ifdef PIC
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# define MO(op) op##@GOTOFF(%ecx)
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@ -187,6 +189,10 @@ ENTRY(__ieee754_powl)
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orl %edx, %ecx
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jnz 6b
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fstp %st(0) // ST*x
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#ifdef PIC
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LOAD_PIC_REG (cx)
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#endif
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LDBL_CHECK_FORCE_UFLOW_NONNAN
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ret
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/* y is ±NAN */
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@ -131,6 +131,40 @@ ldbl_min: \
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addl $8, %esp; \
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cfi_adjust_cfa_offset (-8);
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/* Likewise, but the non-NaN argument may be negative. */
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#define FLT_NARROW_EVAL_UFLOW_NONNAN \
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subl $4, %esp; \
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cfi_adjust_cfa_offset (4); \
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fld %st(0); \
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fabs; \
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fcomps MO(flt_min); \
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fnstsw; \
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sahf; \
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jnc 6424f; \
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fld %st(0); \
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fmul %st(0); \
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fstps (%esp); \
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6424: fstps (%esp); \
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flds (%esp); \
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addl $4, %esp; \
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cfi_adjust_cfa_offset (-4);
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#define DBL_NARROW_EVAL_UFLOW_NONNAN \
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subl $8, %esp; \
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cfi_adjust_cfa_offset (8); \
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fld %st(0); \
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fabs; \
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fcompl MO(dbl_min); \
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fnstsw; \
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sahf; \
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jnc 6453f; \
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fld %st(0); \
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fmul %st(0); \
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fstpl (%esp); \
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6453: fstpl (%esp); \
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fldl (%esp); \
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addl $8, %esp; \
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cfi_adjust_cfa_offset (-8);
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/* Force an underflow exception if the given value is subnormal. The
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relevant constant for the minimum of the type must have been
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defined, the MO macro must have been defined for access to memory
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@ -251,6 +285,18 @@ ldbl_min: \
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addl $8, %esp; \
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cfi_adjust_cfa_offset (-8); \
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6453:
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#define LDBL_CHECK_FORCE_UFLOW_NONNAN \
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fldt MO(ldbl_min); \
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fld %st(1); \
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fabs; \
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fcompp; \
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fnstsw; \
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sahf; \
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jnc 6464f; \
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fld %st(0); \
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fmul %st(0); \
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fstp %st(0); \
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6464:
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/* Likewise, but the argument is nonnegative and not a NaN. */
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#define FLT_CHECK_FORCE_UFLOW_NONNEG \
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@ -119,6 +119,8 @@ __ieee754_pow (double x, double y)
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retval = huge * huge;
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else if (retval == 0)
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retval = tiny * tiny;
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else
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math_check_force_underflow_nonneg (retval);
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return retval;
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}
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|
||||
@ -244,7 +244,12 @@ __ieee754_powf(float x, float y)
|
||||
z = one-(r-z);
|
||||
GET_FLOAT_WORD(j,z);
|
||||
j += (n<<23);
|
||||
if((j>>23)<=0) z = __scalbnf(z,n); /* subnormal output */
|
||||
if((j>>23)<=0) /* subnormal output */
|
||||
{
|
||||
z = __scalbnf (z, n);
|
||||
float force_underflow = z * z;
|
||||
math_force_eval (force_underflow);
|
||||
}
|
||||
else SET_FLOAT_WORD(z,j);
|
||||
return s*z;
|
||||
}
|
||||
|
||||
@ -435,7 +435,11 @@ __ieee754_powl (long double x, long double y)
|
||||
j = o.parts32.w0;
|
||||
j += (n << 16);
|
||||
if ((j >> 16) <= 0)
|
||||
z = __scalbnl (z, n); /* subnormal output */
|
||||
{
|
||||
z = __scalbnl (z, n); /* subnormal output */
|
||||
long double force_underflow = z * z;
|
||||
math_force_eval (force_underflow);
|
||||
}
|
||||
else
|
||||
{
|
||||
o.parts32.w0 = j;
|
||||
|
||||
@ -409,6 +409,7 @@ __ieee754_powl (long double x, long double y)
|
||||
r = (z * t1) / (t1 - two) - (w + z * w);
|
||||
z = one - (r - z);
|
||||
z = __scalbnl (z, n);
|
||||
math_check_force_underflow_nonneg (z);
|
||||
return s * z;
|
||||
}
|
||||
strong_alias (__ieee754_powl, __powl_finite)
|
||||
|
||||
@ -229,6 +229,7 @@ __powl_helper (long double x, long double y)
|
||||
if (negate)
|
||||
res = -res;
|
||||
asm ("fscale" : "=t" (res) : "0" (res), "u" (log2_res_int));
|
||||
math_check_force_underflow (res);
|
||||
return res;
|
||||
}
|
||||
|
||||
|
||||
@ -18,6 +18,7 @@
|
||||
<http://www.gnu.org/licenses/>. */
|
||||
|
||||
#include <machine/asm.h>
|
||||
#include <x86_64-math-asm.h>
|
||||
|
||||
.section .rodata.cst8,"aM",@progbits,8
|
||||
|
||||
@ -59,6 +60,7 @@ minfinity:
|
||||
mzero:
|
||||
.byte 0, 0, 0, 0, 0, 0, 0, 0x80
|
||||
ASM_SIZE_DIRECTIVE(minf_mzero)
|
||||
DEFINE_LDBL_MIN
|
||||
|
||||
#ifdef PIC
|
||||
# define MO(op) op##(%rip)
|
||||
@ -175,6 +177,7 @@ ENTRY(__ieee754_powl)
|
||||
orl %edx, %ecx
|
||||
jnz 6b
|
||||
fstp %st(0) // ST*x
|
||||
LDBL_CHECK_FORCE_UFLOW_NONNAN
|
||||
ret
|
||||
|
||||
/* y is ±NAN */
|
||||
|
||||
@ -46,6 +46,19 @@ ldbl_min: \
|
||||
fstp %st(0); \
|
||||
6464:
|
||||
|
||||
/* Likewise, but the argument is not a NaN. */
|
||||
#define LDBL_CHECK_FORCE_UFLOW_NONNAN \
|
||||
fldt MO(ldbl_min); \
|
||||
fld %st(1); \
|
||||
fabs; \
|
||||
fcomip %st(1), %st(0); \
|
||||
fstp %st(0); \
|
||||
jnc 6464f; \
|
||||
fld %st(0); \
|
||||
fmul %st(0); \
|
||||
fstp %st(0); \
|
||||
6464:
|
||||
|
||||
/* Likewise, but the argument is nonnegative and not a NaN. */
|
||||
#define LDBL_CHECK_FORCE_UFLOW_NONNEG \
|
||||
fldt MO(ldbl_min); \
|
||||
|
||||
Loading…
Reference in New Issue
Block a user