[PATCH v2 0/4] LoongArch: Add some floating-point operations

[Xi Ruoyao <xry111@xry111.site>]

These patches allow to expand the following builtins to floating point
instructions for LoongArch:

- __builtin_rint{,f}
- __builtin_{l,ll}rint{,f}
- __builtin_{l,ll}floor{,f}
- __builtin_{l,ll}ceil{,f}
- __builtin_scalb{n,ln}{,f}
- __builtin_logb{,f}

Bootstrapped and regtested on loongarch64-linux-gnu.  And a modified
Glibc using the builtins for rint{,f}, {l,ll}rint{,f}, and logb{,f}
also survived Glibc test suite.

Please review ASAP because GCC 13 stage 1 will end on Nov. 13th.

v1 -> v2: Only use ftint{rm,rp} instructions if floor and ceil are
allowed to raise inexact exception.

Xi Ruoyao (4):
  LoongArch: Rename frint_<fmt> to rint<mode>2
  LoongArch: Add ftint{,rm,rp}.{w,l}.{s,d} instructions
  LoongArch: Add fscaleb.{s,d} instructions as ldexp{sf,df}3
  LoongArch: Add flogb.{s,d} instructions and expand logb{sf,df}2

 gcc/config/loongarch/loongarch.md             | 95 ++++++++++++++++++-
 gcc/testsuite/gcc.target/loongarch/flogb.c    | 18 ++++
 gcc/testsuite/gcc.target/loongarch/frint.c    | 16 ++++
 gcc/testsuite/gcc.target/loongarch/fscaleb.c  | 48 ++++++++++
 .../gcc.target/loongarch/ftint-no-inexact.c   | 44 +++++++++
 gcc/testsuite/gcc.target/loongarch/ftint.c    | 44 +++++++++
 6 files changed, 261 insertions(+), 4 deletions(-)
 create mode 100644 gcc/testsuite/gcc.target/loongarch/flogb.c
 create mode 100644 gcc/testsuite/gcc.target/loongarch/frint.c
 create mode 100644 gcc/testsuite/gcc.target/loongarch/fscaleb.c
 create mode 100644 gcc/testsuite/gcc.target/loongarch/ftint-no-inexact.c
 create mode 100644 gcc/testsuite/gcc.target/loongarch/ftint.c

-- 
2.38.1