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Historically, float_t has been defined as double on s390 and gcc would emit double precision insns for evaluating float expressions when in standard-compliant mode. Configure that behavior at compile-time as prep for changes in glibc: When glibc ties float_t to double, keep the old behavior; when glibc derives float_t from FLT_EVAL_METHOD (as on most other archs), revert to the default behavior (i.e., FLT_EVAL_METHOD_PROMOTE_TO_FLOAT). Provide a configure option --enable-s390-excess-float-precision to override the check. gcc/ChangeLog: 2020-12-01 Marius Hillenbrand <mhillen@linux.ibm.com> * configure.ac: Add configure option --enable-s390-excess-float-precision and check to derive default from glibc. * config/s390/s390.c: Guard s390_excess_precision with an ifdef for ENABLE_S390_EXCESS_FLOAT_PRECISION. * doc/install.texi: Document --enable-s390-excess-float-precision. * configure: Regenerate. * config.in: Regenerate.
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