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[Bug math/21280] New: [powerpc] logbl for POWER7 return incorrect results
- From: "tuliom at linux dot vnet.ibm.com" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Mon, 20 Mar 2017 19:53:31 +0000
- Subject: [Bug math/21280] New: [powerpc] logbl for POWER7 return incorrect results
- Auto-submitted: auto-generated
https://sourceware.org/bugzilla/show_bug.cgi?id=21280
Bug ID: 21280
Summary: [powerpc] logbl for POWER7 return incorrect results
Product: glibc
Version: 2.25
Status: NEW
Severity: normal
Priority: P2
Component: math
Assignee: unassigned at sourceware dot org
Reporter: tuliom at linux dot vnet.ibm.com
Target Milestone: ---
The errors affect negative subnormals and values near powers of 2.
testing long double (without inline functions)
Failure: Test: logb (-min_subnorm_value)
Result:
is: -1.01100000000000000000000000000000e+03
-0x1.f98000000000000000000000000p+9
should be: -1.07400000000000000000000000000000e+03
-0x1.0c8000000000000000000000000p+10
difference: 6.30000000000000000000000000000000e+01
0x1.f80000000000000000000000000p+5
ulp : 2495687119199326634196634435584.0000
max.ulp : 0.0000
Failure: Test: logb (0x1.ffffffffffffffp1)
Result:
is: 2.00000000000000000000000000000000e+00
0x1.000000000000000000000000000p+1
should be: 1.00000000000000000000000000000000e+00
0x1.000000000000000000000000000p+0
difference: 1.00000000000000000000000000000000e+00
0x1.000000000000000000000000000p+0
ulp : 40564819207303340847894502572032.0000
max.ulp : 0.0000
Failure: Test: logb (-0x1.ffffffffffffffp1)
Result:
is: 2.00000000000000000000000000000000e+00
0x1.000000000000000000000000000p+1
should be: 1.00000000000000000000000000000000e+00
0x1.000000000000000000000000000p+0
difference: 1.00000000000000000000000000000000e+00
0x1.000000000000000000000000000p+0
ulp : 40564819207303340847894502572032.0000
max.ulp : 0.0000
Failure: Test: logb_downward (-min_subnorm_value)
Result:
is: -1.01100000000000000000000000000000e+03
-0x1.f98000000000000000000000000p+9
should be: -1.07400000000000000000000000000000e+03
-0x1.0c8000000000000000000000000p+10
difference: 6.30000000000000000000000000000000e+01
0x1.f80000000000000000000000000p+5
ulp : 2495687119199326634196634435584.0000
max.ulp : 0.0000
Failure: Test: logb_downward (0x1.ffffffffffffffp1)
Result:
is: 2.00000000000000000000000000000000e+00
0x1.000000000000000000000000000p+1
should be: 1.00000000000000000000000000000000e+00
0x1.000000000000000000000000000p+0
difference: 1.00000000000000000000000000000000e+00
0x1.000000000000000000000000000p+0
ulp : 40564819207303340847894502572032.0000
max.ulp : 0.0000
Failure: Test: logb_downward (-0x1.ffffffffffffffp1)
Result:
is: 2.00000000000000000000000000000000e+00
0x1.000000000000000000000000000p+1
should be: 1.00000000000000000000000000000000e+00
0x1.000000000000000000000000000p+0
difference: 1.00000000000000000000000000000000e+00
0x1.000000000000000000000000000p+0
ulp : 40564819207303340847894502572032.0000
max.ulp : 0.0000
Failure: Test: logb_towardzero (-min_subnorm_value)
Result:
is: -1.01100000000000000000000000000000e+03
-0x1.f98000000000000000000000000p+9
should be: -1.07400000000000000000000000000000e+03
-0x1.0c8000000000000000000000000p+10
difference: 6.30000000000000000000000000000000e+01
0x1.f80000000000000000000000000p+5
ulp : 2495687119199326634196634435584.0000
max.ulp : 0.0000
Failure: Test: logb_towardzero (0x1.ffffffffffffffp1)
Result:
is: 2.00000000000000000000000000000000e+00
0x1.000000000000000000000000000p+1
should be: 1.00000000000000000000000000000000e+00
0x1.000000000000000000000000000p+0
difference: 1.00000000000000000000000000000000e+00
0x1.000000000000000000000000000p+0
ulp : 40564819207303340847894502572032.0000
max.ulp : 0.0000
Failure: Test: logb_towardzero (-0x1.ffffffffffffffp1)
Result:
is: 2.00000000000000000000000000000000e+00
0x1.000000000000000000000000000p+1
should be: 1.00000000000000000000000000000000e+00
0x1.000000000000000000000000000p+0
difference: 1.00000000000000000000000000000000e+00
0x1.000000000000000000000000000p+0
ulp : 40564819207303340847894502572032.0000
max.ulp : 0.0000
Failure: Test: logb_upward (-min_subnorm_value)
Result:
is: -1.01100000000000000000000000000000e+03
-0x1.f98000000000000000000000000p+9
should be: -1.07400000000000000000000000000000e+03
-0x1.0c8000000000000000000000000p+10
difference: 6.30000000000000000000000000000000e+01
0x1.f80000000000000000000000000p+5
ulp : 2495687119199326634196634435584.0000
max.ulp : 0.0000
Failure: Test: logb_upward (0x1.ffffffffffffffp1)
Result:
is: 2.00000000000000000000000000000000e+00
0x1.000000000000000000000000000p+1
should be: 1.00000000000000000000000000000000e+00
0x1.000000000000000000000000000p+0
difference: 1.00000000000000000000000000000000e+00
0x1.000000000000000000000000000p+0
ulp : 40564819207303340847894502572032.0000
max.ulp : 0.0000
Failure: Test: logb_upward (-0x1.ffffffffffffffp1)
Result:
is: 2.00000000000000000000000000000000e+00
0x1.000000000000000000000000000p+1
should be: 1.00000000000000000000000000000000e+00
0x1.000000000000000000000000000p+0
difference: 1.00000000000000000000000000000000e+00
0x1.000000000000000000000000000p+0
ulp : 40564819207303340847894502572032.0000
max.ulp : 0.0000
Test suite completed:
120 test cases plus 116 tests for exception flags and
116 tests for errno executed.
12 errors occurred.
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