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| author | Guillaume Melquiond <guillaume.melquiond@inria.fr> | 2020-12-28 15:53:36 +0100 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2020-12-28 15:53:36 +0100 |
| commit | d4513f41c54869c9b4ba96ab79d50933a1d5c25a (patch) | |
| tree | b5ef5b74c19f386791d1f572c45b6b7af0e90451 /flocq/Core/FTZ.v | |
| parent | 548e62be073aa5a7b39d5826cd72681daef7c6a1 (diff) | |
| download | compcert-d4513f41c54869c9b4ba96ab79d50933a1d5c25a.tar.gz compcert-d4513f41c54869c9b4ba96ab79d50933a1d5c25a.zip | |
Update Flocq to 3.4.0 (#383)
Diffstat (limited to 'flocq/Core/FTZ.v')
| -rw-r--r-- | flocq/Core/FTZ.v | 32 |
1 files changed, 17 insertions, 15 deletions
diff --git a/flocq/Core/FTZ.v b/flocq/Core/FTZ.v index 1a93bcd9..d6bae6ea 100644 --- a/flocq/Core/FTZ.v +++ b/flocq/Core/FTZ.v @@ -18,6 +18,8 @@ COPYING file for more details. *) (** * Floating-point format with abrupt underflow *) + +From Coq Require Import Lia. Require Import Raux Defs Round_pred Generic_fmt. Require Import Float_prop Ulp FLX. @@ -48,22 +50,22 @@ unfold FTZ_exp. generalize (Zlt_cases (k - prec) emin). case (Zlt_bool (k - prec) emin) ; intros H1. split ; intros H2. -omega. +lia. split. generalize (Zlt_cases (emin + prec + 1 - prec) emin). case (Zlt_bool (emin + prec + 1 - prec) emin) ; intros H3. -omega. +lia. generalize (Zlt_cases (emin + prec - 1 + 1 - prec) emin). generalize (prec_gt_0 prec). -case (Zlt_bool (emin + prec - 1 + 1 - prec) emin) ; omega. +case (Zlt_bool (emin + prec - 1 + 1 - prec) emin) ; lia. intros l H3. generalize (Zlt_cases (l - prec) emin). -case (Zlt_bool (l - prec) emin) ; omega. +case (Zlt_bool (l - prec) emin) ; lia. split ; intros H2. generalize (Zlt_cases (k + 1 - prec) emin). -case (Zlt_bool (k + 1 - prec) emin) ; omega. +case (Zlt_bool (k + 1 - prec) emin) ; lia. generalize (prec_gt_0 prec). -split ; intros ; omega. +split ; intros ; lia. Qed. Theorem FLXN_format_FTZ : @@ -94,7 +96,7 @@ rewrite Zlt_bool_false. apply Z.le_refl. rewrite Hx1, mag_F2R with (1 := Zxm). cut (prec - 1 < mag beta (IZR xm))%Z. -clear -Hx3 ; omega. +clear -Hx3 ; lia. apply mag_gt_Zpower with (1 := Zxm). apply Hx2. apply generic_format_FLXN. @@ -135,7 +137,7 @@ change (0 < F2R (Float beta (Z.abs (Ztrunc (x * bpow (- (emin + prec - 1))))) (e rewrite F2R_Zabs, <- Hx2. now apply Rabs_pos_lt. apply bpow_le. -omega. +lia. rewrite Hx2. eexists ; repeat split ; simpl. apply le_IZR. @@ -186,7 +188,7 @@ intros e He. unfold FTZ_exp. rewrite Zlt_bool_false. apply Z.le_refl. -omega. +lia. Qed. Theorem ulp_FTZ_0 : @@ -196,12 +198,12 @@ unfold ulp; rewrite Req_bool_true; trivial. case (negligible_exp_spec FTZ_exp). intros T; specialize (T (emin-1)%Z); contradict T. apply Zle_not_lt; unfold FTZ_exp; unfold Prec_gt_0 in prec_gt_0_. -rewrite Zlt_bool_true; omega. +rewrite Zlt_bool_true; lia. assert (V:(FTZ_exp (emin+prec-1) = emin+prec-1)%Z). -unfold FTZ_exp; rewrite Zlt_bool_true; omega. +unfold FTZ_exp; rewrite Zlt_bool_true; lia. intros n H2; rewrite <-V. apply f_equal, fexp_negligible_exp_eq... -omega. +lia. Qed. @@ -290,12 +292,12 @@ apply Rle_trans with (2 := proj1 He). apply bpow_le. unfold FLX_exp. generalize (prec_gt_0 prec). -clear -He' ; omega. +clear -He' ; lia. apply bpow_ge_0. unfold FLX_exp, FTZ_exp. rewrite Zlt_bool_false. apply refl_equal. -clear -He' ; omega. +clear -He' ; lia. Qed. Theorem round_FTZ_small : @@ -331,7 +333,7 @@ intros He'. elim Rlt_not_le with (1 := Hx). apply Rle_trans with (2 := proj1 He). apply bpow_le. -omega. +lia. apply bpow_ge_0. Qed. |