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S390: Allow "v" constraint for long double math_opt_barrier and math_force_eval with GCC 11. 

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
This commit is contained in:
Stefan Liebler 2021-03-31 16:17:01 +02:00
parent a0bf2897ce
commit 01e0451175
1 changed files with 19 additions and 2 deletions
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21
sysdeps/s390/fpu/math-barriers.h
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@ -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 \