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Diffstat (limited to 'kernel/float64_31.ml')
| -rw-r--r-- | kernel/float64_31.ml | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/kernel/float64_31.ml b/kernel/float64_31.ml new file mode 100644 index 0000000000..09b28e6cf0 --- /dev/null +++ b/kernel/float64_31.ml @@ -0,0 +1,35 @@ +(************************************************************************) +(* * The Coq Proof Assistant / The Coq Development Team *) +(* v * Copyright INRIA, CNRS and contributors *) +(* <O___,, * (see version control and CREDITS file for authors & dates) *) +(* \VV/ **************************************************************) +(* // * This file is distributed under the terms of the *) +(* * GNU Lesser General Public License Version 2.1 *) +(* * (see LICENSE file for the text of the license) *) +(************************************************************************) + +include Float64_common + +external mul : float -> float -> float = "coq_fmul_byte" "coq_fmul" +[@@unboxed] [@@noalloc] + +external add : float -> float -> float = "coq_fadd_byte" "coq_fadd" +[@@unboxed] [@@noalloc] + +external sub : float -> float -> float = "coq_fsub_byte" "coq_fsub" +[@@unboxed] [@@noalloc] + +external div : float -> float -> float = "coq_fdiv_byte" "coq_fdiv" +[@@unboxed] [@@noalloc] + +external sqrt : float -> float = "coq_fsqrt_byte" "coq_fsqrt" +[@@unboxed] [@@noalloc] + +(*** Test at runtime that no harmful double rounding seems to + be performed with an intermediate 80 bits representation (x87). *) +let () = + let b = ldexp 1. 53 in + let s = add 1. (ldexp 1. (-52)) in + if add b s <= b || add b 1. <> b || ldexp 1. (-1074) <= 0. then + failwith "Detected non IEEE-754 compliant architecture (or wrong \ + rounding mode). Use of Float is thus unsafe." |