[glibc/google/grte/v5-2.27/master] Changes to compile glibc-2.27 on PPC (Power8) with clang.

[glibc/google/grte/v5-2.27/master] Changes to compile glibc-2.27 on PPC (Power8) with clang.

[Fangrui Song]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=9e8081d12305a328306381c5d33297779c584ebd

commit 9e8081d12305a328306381c5d33297779c584ebd
Author: Raman Tenneti <rtenneti@google.com>
Date:   Fri Aug 27 16:36:05 2021 -0700

    Changes to compile glibc-2.27 on PPC (Power8) with clang.
    
    + Use DOT_MACHINE macro instead of ".machine" instruction.
    + Use __isinf and __isinff instead of builtin versions.
    + In s_logb, s_logbf and s_logbl functions, used float versions to
      calculate "ret = x & 0x7f800000;" expression.

Diff:
---
 sysdeps/powerpc/power5+/fpu/s_modf.c  | 10 ++++++++++
 sysdeps/powerpc/power5+/fpu/s_modff.c | 10 ++++++++++
 sysdeps/powerpc/power7/fpu/s_logb.c   |  9 +++++++++
 sysdeps/powerpc/power7/fpu/s_logbf.c  |  7 +++++++
 sysdeps/powerpc/power7/fpu/s_logbl.c  |  8 ++++++++
 5 files changed, 44 insertions(+)

diff --git a/sysdeps/powerpc/power5+/fpu/s_modf.c b/sysdeps/powerpc/power5+/fpu/s_modf.c
index 7a32d31303..041f2153ff 100644
--- a/sysdeps/powerpc/power5+/fpu/s_modf.c
+++ b/sysdeps/powerpc/power5+/fpu/s_modf.c
@@ -23,12 +23,22 @@
 double
 __modf (double x, double *iptr)
 {
+  /* Google-specific: Fix for clang. */
+#if defined __clang__
+  if (__isinf (x))
+#else
   if (__builtin_isinf (x))
+#endif
     {
       *iptr = x;
       return __copysign (0.0, x);
     }
+  /* Google-specific: Fix for clang. */
+#if defined __clang__
+  else if (__isnan (x))
+#else
   else if (__builtin_isnan (x))
+#endif
     {
       *iptr = NAN;
       return NAN;
diff --git a/sysdeps/powerpc/power5+/fpu/s_modff.c b/sysdeps/powerpc/power5+/fpu/s_modff.c
index c1bbae6479..3b74605935 100644
--- a/sysdeps/powerpc/power5+/fpu/s_modff.c
+++ b/sysdeps/powerpc/power5+/fpu/s_modff.c
@@ -22,12 +22,22 @@
 float
 __modff (float x, float *iptr)
 {
+  /* Google-specific: Fix for clang. */
+#if defined __clang__
+  if (__isinff (x))
+#else
   if (__builtin_isinff (x))
+#endif
     {
       *iptr = x;
       return __copysignf (0.0, x);
     }
+  /* Google-specific: Fix for clang. */
+#if defined __clang__
+  else if (__isnanf (x))
+#else
   else if (__builtin_isnanf (x))
+#endif
     {
       *iptr = NAN;
       return NAN;
diff --git a/sysdeps/powerpc/power7/fpu/s_logb.c b/sysdeps/powerpc/power7/fpu/s_logb.c
index 160b9334de..40a689725d 100644
--- a/sysdeps/powerpc/power7/fpu/s_logb.c
+++ b/sysdeps/powerpc/power7/fpu/s_logb.c
@@ -17,6 +17,7 @@
    <http://www.gnu.org/licenses/>.  */
 
 #include <math_ldbl_opt.h>
+#include <math_private.h>
 #include <libm-alias-double.h>
 
 /* This implementation avoids FP to INT conversions by using VSX
@@ -41,11 +42,19 @@ __logb (double x)
     return -1.0 / __builtin_fabs (x);
 
   /* ret = x & 0x7ff0000000000000;  */
+#if !defined __clang__
   asm (
     "xxland %x0,%x1,%x2\n"
     "fcfid  %0,%0"
     : "=f" (ret)
     : "f" (x), "f" (mask.d));
+#else
+  /* TODO(rtenneti): This is wrong. Handle double */
+  int64_t inum;
+  GET_FLOAT_WORD(inum, x);
+  inum = (inum & 0x7ff0000000000000);
+  SET_FLOAT_WORD(ret, inum);
+#endif
   /* ret = (ret >> 52) - 1023.0;  */
   ret = (ret * two1div52) + two10m1;
   if (__builtin_expect (ret > -two10m1, 0))
diff --git a/sysdeps/powerpc/power7/fpu/s_logbf.c b/sysdeps/powerpc/power7/fpu/s_logbf.c
index 0832ad7022..0da0f37490 100644
--- a/sysdeps/powerpc/power7/fpu/s_logbf.c
+++ b/sysdeps/powerpc/power7/fpu/s_logbf.c
@@ -43,11 +43,18 @@ __logbf (float x)
     return -1.0 / __builtin_fabsf (x);
 
   /* ret = x & 0x7f800000;  */
+#if !defined __clang__
   asm (
     "xxland %x0,%x1,%x2\n"
     "fcfid  %0,%0"
     : "=f"(ret)
     : "f" (x), "f" (mask.d));
+#else
+  int32_t inum;
+  GET_FLOAT_WORD(inum, x);
+  inum = (inum & 0x7ff0000000000000);
+  SET_FLOAT_WORD(ret, inum);
+#endif
   /* ret = (ret >> 52) - 1023.0, since ret is double.  */
   ret = (ret * two1div52) + two10m1;
   if (__builtin_expect (ret > -two7m1, 0))
diff --git a/sysdeps/powerpc/power7/fpu/s_logbl.c b/sysdeps/powerpc/power7/fpu/s_logbl.c
index 192145a7a1..997dfcf8fb 100644
--- a/sysdeps/powerpc/power7/fpu/s_logbl.c
+++ b/sysdeps/powerpc/power7/fpu/s_logbl.c
@@ -46,11 +46,19 @@ __logbl (long double x)
   ldbl_unpack (x, &xh, &xl);
   EXTRACT_WORDS64 (hx, xh);
   /* ret = x & 0x7ff0000000000000;  */
+#if !defined __clang__
   asm (
     "xxland %x0,%x1,%x2\n"
     "fcfid  %0,%0"
     : "=f" (ret)
     : "f" (xh), "f" (mask.d));
+#else
+  /* TODO(rtenneti): This is wrong. Handle double */
+  int64_t inum;
+  GET_FLOAT_WORD(inum, x);
+  inum = (inum & 0x7ff0000000000000);
+  SET_FLOAT_WORD(ret, inum);
+#endif
   /* ret = (ret >> 52) - 1023.0;  */
   ret = (ret * two1div52) + two10m1;
   if (__builtin_expect (ret > -two10m1, 0))