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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 */
|
||||
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