Fix gen-auto-libm-tests sticky bit setting for negative results.

gen-auto-libm-tests has a bug in the logic for setting a sticky bit
based on the ternary value from MPFR: it is correct for positive
results, but for negative results mpz_setbit acts as if a two's
complement representation is used, whereas the low bit needs setting
based on the sign-magnitude representation GMP actually uses.  (This
showed up in converting fma tests to use auto-libm-test-in /
gen-auto-libm-tests.)

This patch fixes the problem by negating the mpz_t value to set its
low bit.  There are lots of changes to auto-libm-test-out (mainly 1ulp
fixes to ldbl-128 expected results), but only a few ulps updates are
needed on x86 / x86_64.  In one case, a corrected expectation showed
up a spurious underflow exception where the correct result is slightly
outside the underflowing range.

Tested x86_64 and x86 and ulps updated accordingly.

	* math/gen-auto-libm-tests.c (adjust_real): Ensure integers are
	non-negative before setting low bit.
	* math/auto-libm-test-in: Mark one asin test possibly having
	spurious underflow.
	* math/auto-libm-test-out: Regenerated.
	* sysdeps/i386/fpu/libm-test-ulps: Update.
	* sysdeps/x86_64/fpu/libm-test-ulps: Likewise.

1 files changed, 69 insertions, 0 deletions

diff --git a/sysdeps/x86_64/fpu/libm-test-ulps b/sysdeps/x86_64/fpu/libm-test-ulps
index 02b6d5b765..4cb77d9acd 100644
--- a/sysdeps/x86_64/fpu/libm-test-ulps
+++ b/sysdeps/x86_64/fpu/libm-test-ulps
@@ -123,11 +123,49 @@ double: 1
 Test "asin_downward (-0x1p+0)":
 double: 1
 idouble: 1
+Test "asin_downward (-0x2p-16384)":
+ildouble: 1
+ldouble: 1
+Test "asin_downward (-0x4p-1024)":
+double: 1
+idouble: 1
+ildouble: 1
+ldouble: 1
+Test "asin_downward (-0x4p-1076)":
+double: 1
+idouble: 1
+ildouble: 1
+ldouble: 1
+Test "asin_downward (-0x4p-128)":
+double: 1
+float: 1
+idouble: 1
+ifloat: 1
+ildouble: 1
+ldouble: 1
+Test "asin_downward (-0x4p-16384)":
+ildouble: 1
+ldouble: 1
+Test "asin_downward (-0x8p-152)":
+double: 1
+float: 1
+idouble: 1
+ifloat: 1
+ildouble: 1
+ldouble: 1
+Test "asin_downward (-0x8p-16448)":
+ildouble: 1
+ldouble: 1
 Test "asin_downward (-0x8p-4)":
 double: 1
 idouble: 1
 ildouble: 1
 ldouble: 1
+Test "asin_downward (-0x8p-972)":
+double: 1
+idouble: 1
+ildouble: 1
+ldouble: 1
 Test "asin_downward (-0xf.fffffff8p-4)":
 double: 1
 idouble: 1
@@ -5127,6 +5165,9 @@ ldouble: 1
 Test "Imaginary part of: ccos (0x4p-1076 + 0x5.ap+8 i)":
 double: 1
 idouble: 1
+Test "Imaginary part of: ccos (0x4p-16328 + 0x1p-120 i)":
+ildouble: 1
+ldouble: 1
 Test "Real part of: ccos (0xcp-4 + 0x1.4p+0 i)":
 double: 1
 float: 1
@@ -8485,6 +8526,13 @@ double: 2
 idouble: 2
 ildouble: 2
 ldouble: 2
+Test "Imaginary part of: ctan_downward (-0xc.35p+12 - 0xc.35p+12 i)":
+double: 1
+float: 1
+idouble: 1
+ifloat: 1
+ildouble: 1
+ldouble: 1
 Test "Real part of: ctan_downward (0x1.921fb4p+0 + +0 i)":
 float: 1
 ifloat: 1
@@ -8631,6 +8679,13 @@ ifloat: 1
 Test "Imaginary part of: ctan_downward (0x8p+16380 + 0x1p+0 i)":
 ildouble: 1
 ldouble: 1
+Test "Imaginary part of: ctan_downward (0xc.35p+12 - 0xc.35p+12 i)":
+double: 1
+float: 1
+idouble: 1
+ifloat: 1
+ildouble: 1
+ldouble: 1
 Test "Real part of: ctan_downward (0xcp-4 + 0x1.4p+0 i)":
 float: 1
 ifloat: 1
@@ -9479,6 +9534,20 @@ idouble: 1
 ifloat: 3
 ildouble: 1
 ldouble: 1
+Test "Real part of: ctanh_downward (-0xc.35p+12 + 0xc.35p+12 i)":
+double: 1
+float: 1
+idouble: 1
+ifloat: 1
+ildouble: 1
+ldouble: 1
+Test "Real part of: ctanh_downward (-0xc.35p+12 - 0xc.35p+12 i)":
+double: 1
+float: 1
+idouble: 1
+ifloat: 1
+ildouble: 1
+ldouble: 1
 Test "Imaginary part of: ctanh_downward (0x1.63p+8 + 0x1p+0 i)":
 ildouble: 1
 ldouble: 1