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This patch implements support for TARGET_ATOMIC_ASSIGN_EXPAND_FENV for powerpc*-*-linux* soft-float and e500, provided GCC is configured for glibc 2.19 or later on the target. New functions __atomic_feholdexcept, __atomic_feclearexcept and __atomic_feupdateenv were added (to libc) in that glibc version (for powerpc soft-float / e500 only) in order to support this part of C11. For soft-float, libc functions are needed because the floating-point exception state is in TLS variables in libc that aren't directly accessible outside of glibc. For e500, they are also needed because of the prctl syscalls involved in controlling trapping for exceptions and informing the kernel when certain exception flags have been cleared. The actual implementation in GCC is a straightforward matter of calling those functions. Tested with no regressions for cross to powerpc-linux-gnu (soft-float); the c11-atomic-exec-5.c results go from FAIL to PASS. * configure.ac (TARGET_GLIBC_MAJOR, TARGET_GLIBC_MINOR): Define macros. * configure, config.h.in: Regenerate. * config/rs6000/linux.h [TARGET_GLIBC_MAJOR > 2 || (TARGET_GLIBC_MAJOR == 2 && TARGET_GLIBC_MINOR >= 19)] (RS6000_GLIBC_ATOMIC_FENV): New macro. * config/rs6000/linux64.h [TARGET_GLIBC_MAJOR > 2 || (TARGET_GLIBC_MAJOR == 2 && TARGET_GLIBC_MINOR >= 19)] (RS6000_GLIBC_ATOMIC_FENV): New macro. * config/rs6000/rs6000.c (atomic_hold_decl, atomic_clear_decl) (atomic_update_decl): New static variables. (rs6000_atomic_assign_expand_fenv) [RS6000_GLIBC_ATOMIC_FENV]: Generate calls to __atomic_feholdexcept, __atomic_feclearexcept and __atomic_feupdateenv for soft-float and no-FPRs. From-SVN: r217040
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