[glibc] x86 long double: Support pseudo numbers in fpclassifyl

[Siddhesh Poyarekar]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=b7f88156174f9bbf9c9393651b2ad0cdd3893e83

commit b7f88156174f9bbf9c9393651b2ad0cdd3893e83
Author: Siddhesh Poyarekar <siddhesh@sourceware.org>
Date:   Wed Dec 23 13:53:34 2020 +0530

    x86 long double: Support pseudo numbers in fpclassifyl
    
    Also move sysdeps/i386/fpu/s_fpclassifyl.c to
    sysdeps/x86/fpu/s_fpclassifyl.c and remove
    sysdeps/x86_64/fpu/s_fpclassifyl.c
    
    Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

Diff:
---
 sysdeps/{i386 => x86}/fpu/s_fpclassifyl.c | 4 ++++
 sysdeps/x86_64/fpu/s_fpclassifyl.c        | 2 --
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/sysdeps/i386/fpu/s_fpclassifyl.c b/sysdeps/x86/fpu/s_fpclassifyl.c
similarity index 87%
rename from sysdeps/i386/fpu/s_fpclassifyl.c
rename to sysdeps/x86/fpu/s_fpclassifyl.c
index 501312f51e..a48b7685c4 100644
--- a/sysdeps/i386/fpu/s_fpclassifyl.c
+++ b/sysdeps/x86/fpu/s_fpclassifyl.c
@@ -34,6 +34,10 @@ __fpclassifyl (long double x)
     retval = FP_ZERO;
   else if (ex == 0 && (hx & 0x80000000) == 0)
     retval = FP_SUBNORMAL;
+  /* Pseudo-normals, i.e. pseudo-zero, pseudo-infinity and un-normals.  They
+     behave like NaNs, so categorize them as such.  */
+  else if ((hx & 0x80000000) == 0)
+    retval = FP_NAN;
   else if (ex == 0x7fff)
     retval = ((hx & 0x7fffffff) | lx) != 0 ? FP_NAN : FP_INFINITE;
 
diff --git a/sysdeps/x86_64/fpu/s_fpclassifyl.c b/sysdeps/x86_64/fpu/s_fpclassifyl.c
deleted file mode 100644
index 856854b0f5..0000000000
--- a/sysdeps/x86_64/fpu/s_fpclassifyl.c
+++ /dev/null
@@ -1,2 +0,0 @@
-#include <sysdeps/i386/fpu/s_fpclassifyl.c>
-