S390: Allow "v" constraint for long double math_opt_barrier and math_force_eval with...

Starting with GCC 11, long double values can also be processed in vector
registers if build with -march >= z14.  Then GCC defines the
__LONG_DOUBLE_VX__ macro.

FYI: GCC commit "IBM Z: Introduce __LONG_DOUBLE_VX__ macro"
https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=f47df2af313d2ce7f9149149010a142c2237beda

diff --git a/sysdeps/s390/fpu/math-barriers.h b/sysdeps/s390/fpu/math-barriers.h
index 68a3e55..13fd300 100644 (file)
--- a/sysdeps/s390/fpu/math-barriers.h
+++ b/sysdeps/s390/fpu/math-barriers.h
@@ -21,13 +21,26 @@
 
 #ifdef HAVE_S390_VX_GCC_SUPPORT
 # define ASM_CONSTRAINT_VR "v"
+# ifdef __LONG_DOUBLE_VX__
+/* Starting with gcc 11, long double values can also be processed in vector
+   registers if build with -march >= z14.  Then GCC defines the
+   __LONG_DOUBLE_VX__ macro.  */
+#  define ASM_LONG_DOUBLE_IN_VR 1
+# else
+#  define ASM_LONG_DOUBLE_IN_VR 0
+# endif
 #else
 # define ASM_CONSTRAINT_VR
+# define ASM_LONG_DOUBLE_IN_VR 0
 #endif
 
 #define math_opt_barrier(x)                                            \
   ({ __typeof (x) __x = (x);                                           \
-    if (__builtin_types_compatible_p (__typeof (x), _Float128))                \
+    if (! ASM_LONG_DOUBLE_IN_VR                                                \
+       && (__builtin_types_compatible_p (__typeof (x), _Float128)      \
+           || __builtin_types_compatible_p (__typeof (x), long double) \
+           )                                                           \
+       )                                                               \
       __asm__ ("# math_opt_barrier_f128 %0" : "+fm" (__x));            \
     else                                                               \
       __asm__ ("# math_opt_barrier %0"                                 \
@@ -35,7 +48,11 @@
     __x; })
 #define math_force_eval(x)                                             \
   ({ __typeof (x) __x = (x);                                           \
-    if (__builtin_types_compatible_p (__typeof (x), _Float128))                \
+    if (! ASM_LONG_DOUBLE_IN_VR                                                \
+       && (__builtin_types_compatible_p (__typeof (x), _Float128)      \
+           || __builtin_types_compatible_p (__typeof (x), long double) \
+           )                                                           \
+       )                                                               \
       __asm__ __volatile__ ("# math_force_eval_f128 %0"                        \
                            : : "fm" (__x));                            \
     else                                                               \