math: xfail some pown and compoundn tests for ibm128-libgcc

On powerpc math/test-ibm128-pown shows below failures:

testing long double (without inline functions)
infinity has wrong sign.
Failure: Test: pown_downward (-inf, 0x7fffffffffffffffLL)
Result:
 is:          inf   inf
 should be:  -inf  -inf
Failure: Test: pown_downward (-0, 9223372036854775807LL)
Result:
 is:          0.00000000000000000000000000000000e+00   0x0.000000000000000000000000000p+0
 should be:  -0.00000000000000000000000000000000e+00  -0x0.000000000000000000000000000p+0
 difference:  0.00000000000000000000000000000000e+00   0x0.000000000000000000000000000p+0
 ulp       :  0.0000
 max.ulp   :  16.0000
Failure: pown_downward (-0x1p+0, 9223372036854775807LL): Exception "Invalid operation" set
Failure: pown_downward (-0x1p+0, 9223372036854775807LL): errno set to 34, expected 0 (unchanged)
Failure: Test: pown_downward (-0x1p+0, 9223372036854775807LL)
Result:
 is:         qNaN
 should be:  -1.00000000000000000000000000000000e+00  -0x1.000000000000000000000000000p+0
infinity has wrong sign.
Failure: Test: pown_towardzero (-0, -0x7fffffffffffffffLL)
Result:
 is:          inf   inf
 should be:  -inf  -inf
infinity has wrong sign.
Failure: Test: pown_towardzero (-inf, 0x7fffffffffffffffLL)
Result:
 is:          inf   inf
 should be:  -inf  -inf
Failure: Test: pown_towardzero (-inf, -0x7fffffffffffffffLL)
Result:
 is:          0.00000000000000000000000000000000e+00   0x0.000000000000000000000000000p+0
 should be:  -0.00000000000000000000000000000000e+00  -0x0.000000000000000000000000000p+0
 difference:  0.00000000000000000000000000000000e+00   0x0.000000000000000000000000000p+0
 ulp       :  0.0000
 max.ulp   :  16.0000
Failure: Test: pown_towardzero (-0, 9223372036854775807LL)
Result:
 is:          0.00000000000000000000000000000000e+00   0x0.000000000000000000000000000p+0
 should be:  -0.00000000000000000000000000000000e+00  -0x0.000000000000000000000000000p+0
 difference:  0.00000000000000000000000000000000e+00   0x0.000000000000000000000000000p+0
 ulp       :  0.0000
 max.ulp   :  16.0000
Failure: pown_towardzero (-0x1p+0, -9223372036854775807LL): Exception "Invalid operation" set
Failure: pown_towardzero (-0x1p+0, -9223372036854775807LL): errno set to 34, expected 0 (unchanged)
Failure: Test: pown_towardzero (-0x1p+0, -9223372036854775807LL)
Result:
 is:         qNaN
 should be:  -1.00000000000000000000000000000000e+00  -0x1.000000000000000000000000000p+0
Failure: pown_towardzero (-0x1p+0, 9223372036854775807LL): Exception "Invalid operation" set
Failure: pown_towardzero (-0x1p+0, 9223372036854775807LL): errno set to 34, expected 0 (unchanged)
Failure: Test: pown_towardzero (-0x1p+0, 9223372036854775807LL)
Result:
 is:         qNaN
 should be:  -1.00000000000000000000000000000000e+00  -0x1.000000000000000000000000000p+0
infinity has wrong sign.
Failure: Test: pown_upward (-0, -0x7fffffffffffffffLL)
Result:
 is:          inf   inf
 should be:  -inf  -inf
Failure: Test: pown_upward (-inf, -0x7fffffffffffffffLL)
Result:
 is:          0.00000000000000000000000000000000e+00   0x0.000000000000000000000000000p+0
 should be:  -0.00000000000000000000000000000000e+00  -0x0.000000000000000000000000000p+0
 difference:  0.00000000000000000000000000000000e+00   0x0.000000000000000000000000000p+0
 ulp       :  0.0000
 max.ulp   :  16.0000
Failure: pown_upward (-0x1p+0, -9223372036854775807LL): Exception "Invalid operation" set
Failure: pown_upward (-0x1p+0, -9223372036854775807LL): errno set to 34, expected 0 (unchanged)
Failure: Test: pown_upward (-0x1p+0, -9223372036854775807LL)
Result:
 is:         qNaN
 should be:  -1.00000000000000000000000000000000e+00  -0x1.000000000000000000000000000p+0

Likewise, math/test-ibm128-compoundn shows below failure:

testing long double (without inline functions)
Failure: compoundn_upward (0xf.ffffffffffff8p+1020, 1LL): Exception "Overflow" set
Failure: compoundn_upward (0xf.ffffffffffff8p+1020, 1LL): errno set to 34, expected 0 (unchanged)
Failure: Test: compoundn_upward (0xf.ffffffffffff8p+1020, 1LL)
Result:
 is:          inf   inf
 should be:   1.79769313486231570814527423731707e+308   0x1.fffffffffffff00000000000008p+1023

Signed-off-by: Sachin Monga <smonga@linux.ibm.com>
Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

3 files changed, 44 insertions, 44 deletions

diff --git a/math/auto-libm-test-out-compoundn b/math/auto-libm-test-out-compoundn
index 269fe53..059fbd0 100644
--- a/math/auto-libm-test-out-compoundn
+++ b/math/auto-libm-test-out-compoundn
@@ -2137,23 +2137,23 @@ compoundn max 1
 = compoundn downward binary64 0xf.ffffffffffff8p+1020 1LL : 0xf.ffffffffffff8p+1020 : inexact-ok
 = compoundn tonearest binary64 0xf.ffffffffffff8p+1020 1LL : 0xf.ffffffffffff8p+1020 : inexact-ok
 = compoundn towardzero binary64 0xf.ffffffffffff8p+1020 1LL : 0xf.ffffffffffff8p+1020 : inexact-ok
-= compoundn upward binary64 0xf.ffffffffffff8p+1020 1LL : plus_infty : inexact-ok overflow errno-erange
+= compoundn upward binary64 0xf.ffffffffffff8p+1020 1LL : plus_infty : xfail:ibm128-libgcc inexact-ok  overflow errno-erange
 = compoundn downward intel96 0xf.ffffffffffff8p+1020 1LL : 0xf.ffffffffffff8p+1020 : inexact-ok
 = compoundn tonearest intel96 0xf.ffffffffffff8p+1020 1LL : 0xf.ffffffffffff8p+1020 : inexact-ok
 = compoundn towardzero intel96 0xf.ffffffffffff8p+1020 1LL : 0xf.ffffffffffff8p+1020 : inexact-ok
-= compoundn upward intel96 0xf.ffffffffffff8p+1020 1LL : 0xf.ffffffffffff801p+1020 : inexact-ok
+= compoundn upward intel96 0xf.ffffffffffff8p+1020 1LL : 0xf.ffffffffffff801p+1020 : xfail:ibm128-libgcc inexact-ok
 = compoundn downward m68k96 0xf.ffffffffffff8p+1020 1LL : 0xf.ffffffffffff8p+1020 : inexact-ok
 = compoundn tonearest m68k96 0xf.ffffffffffff8p+1020 1LL : 0xf.ffffffffffff8p+1020 : inexact-ok
 = compoundn towardzero m68k96 0xf.ffffffffffff8p+1020 1LL : 0xf.ffffffffffff8p+1020 : inexact-ok
-= compoundn upward m68k96 0xf.ffffffffffff8p+1020 1LL : 0xf.ffffffffffff801p+1020 : inexact-ok
+= compoundn upward m68k96 0xf.ffffffffffff8p+1020 1LL : 0xf.ffffffffffff801p+1020 : xfail:ibm128-libgcc inexact-ok
 = compoundn downward binary128 0xf.ffffffffffff8p+1020 1LL : 0xf.ffffffffffff8p+1020 : inexact-ok
 = compoundn tonearest binary128 0xf.ffffffffffff8p+1020 1LL : 0xf.ffffffffffff8p+1020 : inexact-ok
 = compoundn towardzero binary128 0xf.ffffffffffff8p+1020 1LL : 0xf.ffffffffffff8p+1020 : inexact-ok
-= compoundn upward binary128 0xf.ffffffffffff8p+1020 1LL : 0xf.ffffffffffff8000000000000008p+1020 : inexact-ok
+= compoundn upward binary128 0xf.ffffffffffff8p+1020 1LL : 0xf.ffffffffffff8000000000000008p+1020 : xfail:ibm128-libgcc inexact-ok
 = compoundn downward ibm128 0xf.ffffffffffff8p+1020 1LL : 0xf.ffffffffffff8p+1020 : inexact-ok
 = compoundn tonearest ibm128 0xf.ffffffffffff8p+1020 1LL : 0xf.ffffffffffff8p+1020 : inexact-ok
 = compoundn towardzero ibm128 0xf.ffffffffffff8p+1020 1LL : 0xf.ffffffffffff8p+1020 : inexact-ok
-= compoundn upward ibm128 0xf.ffffffffffff8p+1020 1LL : 0xf.ffffffffffff80000000000004p+1020 : inexact-ok
+= compoundn upward ibm128 0xf.ffffffffffff8p+1020 1LL : 0xf.ffffffffffff80000000000004p+1020 : xfail:ibm128-libgcc inexact-ok
 = compoundn downward intel96 0xf.fffffffffffffffp+16380 1LL : 0xf.fffffffffffffffp+16380 : inexact-ok
 = compoundn tonearest intel96 0xf.fffffffffffffffp+16380 1LL : 0xf.fffffffffffffffp+16380 : inexact-ok
 = compoundn towardzero intel96 0xf.fffffffffffffffp+16380 1LL : 0xf.fffffffffffffffp+16380 : inexact-ok
diff --git a/math/auto-libm-test-out-pown b/math/auto-libm-test-out-pown
index 5027062..e58bc8e 100644
--- a/math/auto-libm-test-out-pown
+++ b/math/auto-libm-test-out-pown
@@ -824,29 +824,29 @@ pown -0 0x3ffffffffffffe
 = pown towardzero ibm128 -0x0p+0 18014398509481982LL : 0x0p+0 : inexact-ok
 = pown upward ibm128 -0x0p+0 18014398509481982LL : 0x0p+0 : inexact-ok
 pown -0 0x7fffffffffffffff
-= pown downward binary32 -0x0p+0 9223372036854775807LL : -0x0p+0 : inexact-ok
+= pown downward binary32 -0x0p+0 9223372036854775807LL : -0x0p+0 : xfail:ibm128-libgcc inexact-ok
 = pown tonearest binary32 -0x0p+0 9223372036854775807LL : -0x0p+0 : inexact-ok
-= pown towardzero binary32 -0x0p+0 9223372036854775807LL : -0x0p+0 : inexact-ok
+= pown towardzero binary32 -0x0p+0 9223372036854775807LL : -0x0p+0 : xfail:ibm128-libgcc inexact-ok
 = pown upward binary32 -0x0p+0 9223372036854775807LL : -0x0p+0 : inexact-ok
-= pown downward binary64 -0x0p+0 9223372036854775807LL : -0x0p+0 : inexact-ok
+= pown downward binary64 -0x0p+0 9223372036854775807LL : -0x0p+0 : xfail:ibm128-libgcc inexact-ok
 = pown tonearest binary64 -0x0p+0 9223372036854775807LL : -0x0p+0 : inexact-ok
-= pown towardzero binary64 -0x0p+0 9223372036854775807LL : -0x0p+0 : inexact-ok
+= pown towardzero binary64 -0x0p+0 9223372036854775807LL : -0x0p+0 : xfail:ibm128-libgcc inexact-ok
 = pown upward binary64 -0x0p+0 9223372036854775807LL : -0x0p+0 : inexact-ok
-= pown downward intel96 -0x0p+0 9223372036854775807LL : -0x0p+0 : inexact-ok
+= pown downward intel96 -0x0p+0 9223372036854775807LL : -0x0p+0 : xfail:ibm128-libgcc inexact-ok
 = pown tonearest intel96 -0x0p+0 9223372036854775807LL : -0x0p+0 : inexact-ok
-= pown towardzero intel96 -0x0p+0 9223372036854775807LL : -0x0p+0 : inexact-ok
+= pown towardzero intel96 -0x0p+0 9223372036854775807LL : -0x0p+0 : xfail:ibm128-libgcc inexact-ok
 = pown upward intel96 -0x0p+0 9223372036854775807LL : -0x0p+0 : inexact-ok
-= pown downward m68k96 -0x0p+0 9223372036854775807LL : -0x0p+0 : inexact-ok
+= pown downward m68k96 -0x0p+0 9223372036854775807LL : -0x0p+0 : xfail:ibm128-libgcc inexact-ok
 = pown tonearest m68k96 -0x0p+0 9223372036854775807LL : -0x0p+0 : inexact-ok
-= pown towardzero m68k96 -0x0p+0 9223372036854775807LL : -0x0p+0 : inexact-ok
+= pown towardzero m68k96 -0x0p+0 9223372036854775807LL : -0x0p+0 : xfail:ibm128-libgcc inexact-ok
 = pown upward m68k96 -0x0p+0 9223372036854775807LL : -0x0p+0 : inexact-ok
-= pown downward binary128 -0x0p+0 9223372036854775807LL : -0x0p+0 : inexact-ok
+= pown downward binary128 -0x0p+0 9223372036854775807LL : -0x0p+0 : xfail:ibm128-libgcc inexact-ok
 = pown tonearest binary128 -0x0p+0 9223372036854775807LL : -0x0p+0 : inexact-ok
-= pown towardzero binary128 -0x0p+0 9223372036854775807LL : -0x0p+0 : inexact-ok
+= pown towardzero binary128 -0x0p+0 9223372036854775807LL : -0x0p+0 : xfail:ibm128-libgcc inexact-ok
 = pown upward binary128 -0x0p+0 9223372036854775807LL : -0x0p+0 : inexact-ok
-= pown downward ibm128 -0x0p+0 9223372036854775807LL : -0x0p+0 : inexact-ok
+= pown downward ibm128 -0x0p+0 9223372036854775807LL : -0x0p+0 : xfail:ibm128-libgcc inexact-ok
 = pown tonearest ibm128 -0x0p+0 9223372036854775807LL : -0x0p+0 : inexact-ok
-= pown towardzero ibm128 -0x0p+0 9223372036854775807LL : -0x0p+0 : inexact-ok
+= pown towardzero ibm128 -0x0p+0 9223372036854775807LL : -0x0p+0 : xfail:ibm128-libgcc inexact-ok
 = pown upward ibm128 -0x0p+0 9223372036854775807LL : -0x0p+0 : inexact-ok
 pown 0.0 4
 = pown downward binary32 0x0p+0 4LL : 0x0p+0 : inexact-ok
@@ -1101,28 +1101,28 @@ pown -1.0 -0x3ffffffffffffe
 pown -1.0 -0x7fffffffffffffff
 = pown downward binary32 -0x1p+0 -9223372036854775807LL : -0x1p+0 : inexact-ok
 = pown tonearest binary32 -0x1p+0 -9223372036854775807LL : -0x1p+0 : inexact-ok
-= pown towardzero binary32 -0x1p+0 -9223372036854775807LL : -0x1p+0 : inexact-ok
-= pown upward binary32 -0x1p+0 -9223372036854775807LL : -0x1p+0 : inexact-ok
+= pown towardzero binary32 -0x1p+0 -9223372036854775807LL : -0x1p+0 : xfail:ibm128-libgcc inexact-ok
+= pown upward binary32 -0x1p+0 -9223372036854775807LL : -0x1p+0 : xfail:ibm128-libgcc inexact-ok
 = pown downward binary64 -0x1p+0 -9223372036854775807LL : -0x1p+0 : inexact-ok
 = pown tonearest binary64 -0x1p+0 -9223372036854775807LL : -0x1p+0 : inexact-ok
-= pown towardzero binary64 -0x1p+0 -9223372036854775807LL : -0x1p+0 : inexact-ok
-= pown upward binary64 -0x1p+0 -9223372036854775807LL : -0x1p+0 : inexact-ok
+= pown towardzero binary64 -0x1p+0 -9223372036854775807LL : -0x1p+0 : xfail:ibm128-libgcc inexact-ok
+= pown upward binary64 -0x1p+0 -9223372036854775807LL : -0x1p+0 : xfail:ibm128-libgcc inexact-ok
 = pown downward intel96 -0x1p+0 -9223372036854775807LL : -0x1p+0 : inexact-ok
 = pown tonearest intel96 -0x1p+0 -9223372036854775807LL : -0x1p+0 : inexact-ok
-= pown towardzero intel96 -0x1p+0 -9223372036854775807LL : -0x1p+0 : inexact-ok
-= pown upward intel96 -0x1p+0 -9223372036854775807LL : -0x1p+0 : inexact-ok
+= pown towardzero intel96 -0x1p+0 -9223372036854775807LL : -0x1p+0 : xfail:ibm128-libgcc inexact-ok
+= pown upward intel96 -0x1p+0 -9223372036854775807LL : -0x1p+0 : xfail:ibm128-libgcc inexact-ok
 = pown downward m68k96 -0x1p+0 -9223372036854775807LL : -0x1p+0 : inexact-ok
 = pown tonearest m68k96 -0x1p+0 -9223372036854775807LL : -0x1p+0 : inexact-ok
-= pown towardzero m68k96 -0x1p+0 -9223372036854775807LL : -0x1p+0 : inexact-ok
-= pown upward m68k96 -0x1p+0 -9223372036854775807LL : -0x1p+0 : inexact-ok
+= pown towardzero m68k96 -0x1p+0 -9223372036854775807LL : -0x1p+0 : xfail:ibm128-libgcc inexact-ok
+= pown upward m68k96 -0x1p+0 -9223372036854775807LL : -0x1p+0 : xfail:ibm128-libgcc inexact-ok
 = pown downward binary128 -0x1p+0 -9223372036854775807LL : -0x1p+0 : inexact-ok
 = pown tonearest binary128 -0x1p+0 -9223372036854775807LL : -0x1p+0 : inexact-ok
-= pown towardzero binary128 -0x1p+0 -9223372036854775807LL : -0x1p+0 : inexact-ok
-= pown upward binary128 -0x1p+0 -9223372036854775807LL : -0x1p+0 : inexact-ok
+= pown towardzero binary128 -0x1p+0 -9223372036854775807LL : -0x1p+0 : xfail:ibm128-libgcc inexact-ok
+= pown upward binary128 -0x1p+0 -9223372036854775807LL : -0x1p+0 : xfail:ibm128-libgcc inexact-ok
 = pown downward ibm128 -0x1p+0 -9223372036854775807LL : -0x1p+0 : inexact-ok
 = pown tonearest ibm128 -0x1p+0 -9223372036854775807LL : -0x1p+0 : inexact-ok
-= pown towardzero ibm128 -0x1p+0 -9223372036854775807LL : -0x1p+0 : inexact-ok
-= pown upward ibm128 -0x1p+0 -9223372036854775807LL : -0x1p+0 : inexact-ok
+= pown towardzero ibm128 -0x1p+0 -9223372036854775807LL : -0x1p+0 : xfail:ibm128-libgcc inexact-ok
+= pown upward ibm128 -0x1p+0 -9223372036854775807LL : -0x1p+0 : xfail:ibm128-libgcc inexact-ok
 pown -1.0 0xffffff
 = pown downward binary32 -0x1p+0 16777215LL : -0x1p+0 : inexact-ok
 = pown tonearest binary32 -0x1p+0 16777215LL : -0x1p+0 : inexact-ok
@@ -1224,29 +1224,29 @@ pown -1.0 0x3ffffffffffffe
 = pown towardzero ibm128 -0x1p+0 18014398509481982LL : 0x1p+0 : inexact-ok
 = pown upward ibm128 -0x1p+0 18014398509481982LL : 0x1p+0 : inexact-ok
 pown -1.0 0x7fffffffffffffff
-= pown downward binary32 -0x1p+0 9223372036854775807LL : -0x1p+0 : inexact-ok
+= pown downward binary32 -0x1p+0 9223372036854775807LL : -0x1p+0 : xfail:ibm128-libgcc inexact-ok
 = pown tonearest binary32 -0x1p+0 9223372036854775807LL : -0x1p+0 : inexact-ok
-= pown towardzero binary32 -0x1p+0 9223372036854775807LL : -0x1p+0 : inexact-ok
+= pown towardzero binary32 -0x1p+0 9223372036854775807LL : -0x1p+0 : xfail:ibm128-libgcc inexact-ok
 = pown upward binary32 -0x1p+0 9223372036854775807LL : -0x1p+0 : inexact-ok
-= pown downward binary64 -0x1p+0 9223372036854775807LL : -0x1p+0 : inexact-ok
+= pown downward binary64 -0x1p+0 9223372036854775807LL : -0x1p+0 : xfail:ibm128-libgcc inexact-ok
 = pown tonearest binary64 -0x1p+0 9223372036854775807LL : -0x1p+0 : inexact-ok
-= pown towardzero binary64 -0x1p+0 9223372036854775807LL : -0x1p+0 : inexact-ok
+= pown towardzero binary64 -0x1p+0 9223372036854775807LL : -0x1p+0 : xfail:ibm128-libgcc inexact-ok
 = pown upward binary64 -0x1p+0 9223372036854775807LL : -0x1p+0 : inexact-ok
-= pown downward intel96 -0x1p+0 9223372036854775807LL : -0x1p+0 : inexact-ok
+= pown downward intel96 -0x1p+0 9223372036854775807LL : -0x1p+0 : xfail:ibm128-libgcc inexact-ok
 = pown tonearest intel96 -0x1p+0 9223372036854775807LL : -0x1p+0 : inexact-ok
-= pown towardzero intel96 -0x1p+0 9223372036854775807LL : -0x1p+0 : inexact-ok
+= pown towardzero intel96 -0x1p+0 9223372036854775807LL : -0x1p+0 : xfail:ibm128-libgcc inexact-ok
 = pown upward intel96 -0x1p+0 9223372036854775807LL : -0x1p+0 : inexact-ok
-= pown downward m68k96 -0x1p+0 9223372036854775807LL : -0x1p+0 : inexact-ok
+= pown downward m68k96 -0x1p+0 9223372036854775807LL : -0x1p+0 : xfail:ibm128-libgcc inexact-ok
 = pown tonearest m68k96 -0x1p+0 9223372036854775807LL : -0x1p+0 : inexact-ok
-= pown towardzero m68k96 -0x1p+0 9223372036854775807LL : -0x1p+0 : inexact-ok
+= pown towardzero m68k96 -0x1p+0 9223372036854775807LL : -0x1p+0 : xfail:ibm128-libgcc inexact-ok
 = pown upward m68k96 -0x1p+0 9223372036854775807LL : -0x1p+0 : inexact-ok
-= pown downward binary128 -0x1p+0 9223372036854775807LL : -0x1p+0 : inexact-ok
+= pown downward binary128 -0x1p+0 9223372036854775807LL : -0x1p+0 : xfail:ibm128-libgcc inexact-ok
 = pown tonearest binary128 -0x1p+0 9223372036854775807LL : -0x1p+0 : inexact-ok
-= pown towardzero binary128 -0x1p+0 9223372036854775807LL : -0x1p+0 : inexact-ok
+= pown towardzero binary128 -0x1p+0 9223372036854775807LL : -0x1p+0 : xfail:ibm128-libgcc inexact-ok
 = pown upward binary128 -0x1p+0 9223372036854775807LL : -0x1p+0 : inexact-ok
-= pown downward ibm128 -0x1p+0 9223372036854775807LL : -0x1p+0 : inexact-ok
+= pown downward ibm128 -0x1p+0 9223372036854775807LL : -0x1p+0 : xfail:ibm128-libgcc inexact-ok
 = pown tonearest ibm128 -0x1p+0 9223372036854775807LL : -0x1p+0 : inexact-ok
-= pown towardzero ibm128 -0x1p+0 9223372036854775807LL : -0x1p+0 : inexact-ok
+= pown towardzero ibm128 -0x1p+0 9223372036854775807LL : -0x1p+0 : xfail:ibm128-libgcc inexact-ok
 = pown upward ibm128 -0x1p+0 9223372036854775807LL : -0x1p+0 : inexact-ok
 pown -2.0 126
 = pown downward binary32 -0x2p+0 126LL : 0x4p+124 : inexact-ok
diff --git a/math/libm-test-pown.inc b/math/libm-test-pown.inc
index 8e04f30..0bcebc3 100644
--- a/math/libm-test-pown.inc
+++ b/math/libm-test-pown.inc
@@ -79,7 +79,7 @@ static const struct test_fL_f_data pown_test_data[] =
     TEST_fL_f (pown, minus_zero, -0x1fffffffffffffLL, minus_infty, DIVIDE_BY_ZERO_EXCEPTION|ERRNO_ERANGE),
     TEST_fL_f (pown, minus_zero, -0x3ffffffffffffeLL, plus_infty, DIVIDE_BY_ZERO_EXCEPTION|ERRNO_ERANGE),
     TEST_fL_f (pown, minus_zero, -0x7ffffffffffffffeLL, plus_infty, DIVIDE_BY_ZERO_EXCEPTION|ERRNO_ERANGE),
-    TEST_fL_f (pown, minus_zero, -0x7fffffffffffffffLL, minus_infty, DIVIDE_BY_ZERO_EXCEPTION|ERRNO_ERANGE),
+    TEST_fL_f (pown, minus_zero, -0x7fffffffffffffffLL, minus_infty, DIVIDE_BY_ZERO_EXCEPTION|ERRNO_ERANGE|XFAIL_ROUNDING_IBM128_LIBGCC),
 
     TEST_fL_f (pown, 0, -2, plus_infty, DIVIDE_BY_ZERO_EXCEPTION|ERRNO_ERANGE),
     TEST_fL_f (pown, 0, -0x1000000, plus_infty, DIVIDE_BY_ZERO_EXCEPTION|ERRNO_ERANGE),
@@ -107,7 +107,7 @@ static const struct test_fL_f_data pown_test_data[] =
     TEST_fL_f (pown, minus_infty, 0x1fffffffffffffLL, minus_infty, ERRNO_UNCHANGED),
     TEST_fL_f (pown, minus_infty, 0x3ffffffffffffeL, plus_infty, ERRNO_UNCHANGED),
     TEST_fL_f (pown, minus_infty, 0x7ffffffffffffffeLL, plus_infty, ERRNO_UNCHANGED),
-    TEST_fL_f (pown, minus_infty, 0x7fffffffffffffffLL, minus_infty, ERRNO_UNCHANGED),
+    TEST_fL_f (pown, minus_infty, 0x7fffffffffffffffLL, minus_infty, ERRNO_UNCHANGED|XFAIL_ROUNDING_IBM128_LIBGCC),
 
     /* pown (-inf, y) == +inf for y > 0 and not an odd integer.  */
     TEST_fL_f (pown, minus_infty, 28, plus_infty, ERRNO_UNCHANGED),
@@ -122,7 +122,7 @@ static const struct test_fL_f_data pown_test_data[] =
     TEST_fL_f (pown, minus_infty, -0x1fffffffffffffLL, minus_zero, ERRNO_UNCHANGED),
     TEST_fL_f (pown, minus_infty, -0x3ffffffffffffeLL, plus_zero, ERRNO_UNCHANGED),
     TEST_fL_f (pown, minus_infty, -0x7ffffffffffffffeLL, plus_zero, ERRNO_UNCHANGED),
-    TEST_fL_f (pown, minus_infty, -0x7fffffffffffffffLL, minus_zero, ERRNO_UNCHANGED),
+    TEST_fL_f (pown, minus_infty, -0x7fffffffffffffffLL, minus_zero, ERRNO_UNCHANGED|XFAIL_ROUNDING_IBM128_LIBGCC),
 
     /* pown (-inf, y) == +0 for y < 0 and not an odd integer.  */
     TEST_fL_f (pown, minus_infty, -2, 0.0, ERRNO_UNCHANGED),