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diff --git a/gcc-4.9/gcc/testsuite/ada/acats/tests/c4/c490002.a b/gcc-4.9/gcc/testsuite/ada/acats/tests/c4/c490002.a new file mode 100644 index 000000000..71169b833 --- /dev/null +++ b/gcc-4.9/gcc/testsuite/ada/acats/tests/c4/c490002.a @@ -0,0 +1,239 @@ +-- C490002.A +-- +-- Grant of Unlimited Rights +-- +-- Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687, +-- F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained +-- unlimited rights in the software and documentation contained herein. +-- Unlimited rights are defined in DFAR 252.227-7013(a)(19). By making +-- this public release, the Government intends to confer upon all +-- recipients unlimited rights equal to those held by the Government. +-- These rights include rights to use, duplicate, release or disclose the +-- released technical data and computer software in whole or in part, in +-- any manner and for any purpose whatsoever, and to have or permit others +-- to do so. +-- +-- DISCLAIMER +-- +-- ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR +-- DISCLOSED ARE AS IS. THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED +-- WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE +-- SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE +-- OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A +-- PARTICULAR PURPOSE OF SAID MATERIAL. +--* +-- +-- OBJECTIVE: +-- Check that, for a real static expression that is not part of a larger +-- static expression, and whose expected type T is an ordinary fixed +-- point type that is not a descendant of a formal scalar type, the value +-- is rounded to the nearest integral multiple of the small of T if +-- T'Machine_Rounds is true, and is truncated otherwise. Check that if +-- rounding is performed, and the value is exactly halfway between two +-- multiples of the small, one of the two multiples of small is used. +-- +-- TEST DESCRIPTION: +-- The test obtains an integral multiple M1 of the small of an ordinary +-- fixed point subtype S by dividing a real literal by S'Small, and then +-- truncating the result using 'Truncation. It then obtains an adjacent +-- multiple M2 of the small by using S'Succ (or S'Pred). It then +-- constructs values which lie between these multiples: one (A) which is +-- closer to M1, one (B) which is exactly halfway between M1 and M2, and +-- one (C) which is closer to M2. This is done for both positive and +-- negative multiples of the small. +-- +-- Let M1 be closer to zero than M2. Then if S'Machine_Rounds is true, +-- C must be rounded to M2, A must be rounded to M1, and B must be rounded +-- to either M1 or M2. If S'Machine_Rounds is false, all the values must +-- be truncated to M1. +-- +-- A, B, and C are constructed using the following static expressions: +-- +-- A: constant S := M1 + (M2 - M1)/Z; -- Z slightly more than 2.0. +-- B: constant S := M1 + (M2 - M1)/Z; -- Z equals 2.0. +-- C: constant S := M1 + (M2 - M1)/Z; -- Z slightly less than 2.0. +-- +-- Since these are static expressions, they must be evaluated exactly, +-- and no rounding may occur until the final result is calculated. +-- +-- The checks for equality between the members of (A, B, C) and (M1, M2) +-- are performed at run-time within the body of a subprogram. +-- +-- The test performs additional checks that the rounding performed on +-- real literals is consistent for ordinary fixed point subtypes. A +-- named number (initialized with a literal) is assigned to a constant of +-- a fixed point subtype S. The same literal is then passed to a +-- subprogram, along with the constant, and an equality check is +-- performed within the body of the subprogram. +-- +-- +-- CHANGE HISTORY: +-- 26 Sep 95 SAIC Initial prerelease version. +-- +--! + +package C490002_0 is + + type My_Fix is delta 0.0625 range -1000.0 .. 1000.0; + + Small : constant := My_Fix'Small; -- Named number. + + procedure Fixed_Subtest (A, B: in My_Fix; Msg: in String); + + procedure Fixed_Subtest (A, B, C: in My_Fix; Msg: in String); + + +-- +-- Positive cases: +-- + + -- |----|-------------|-----------------|-------------------|-----------| + -- | | | | | | + -- 0 P_M1 Less_Pos_Than_Half Pos_Exactly_Half More_Pos_Than_Half P_M2 + + + Positive_Real : constant := 0.11433; -- Named number. + Pos_Multiplier : constant := Float'Truncation(Positive_Real/Small); + + -- Pos_Multiplier is the number of integral multiples of small contained + -- in Positive_Real. P_M1 is thus the largest integral multiple of + -- small less than or equal to Positive_Real. Note that since Positive_Real + -- is a named number and not a fixed point object, P_M1 is generated + -- without assuming that rounding is performed correctly for fixed point + -- subtypes. + + Positive_Fixed : constant My_Fix := Positive_Real; + + P_M1 : constant My_Fix := Pos_Multiplier * Small; + P_M2 : constant My_Fix := My_Fix'Succ(P_M1); + + -- P_M1 and P_M2 are adjacent multiples of the small of My_Fix. Note that + -- 0.11433 either equals P_M1 (if it is an integral multiple of the small) + -- or lies between P_M1 and P_M2 (since truncation was forced in + -- generating Pos_Multiplier). It is not certain, however, exactly where + -- it lies between them (halfway, less than halfway, more than halfway). + -- This fact is irrelevant to the test. + + + -- The following entities are used to verify that rounding is performed + -- according to the value of 'Machine_Rounds. If language rules are + -- obeyed, the intermediate expressions in the following static + -- initialization expressions will not be rounded; all calculations will + -- be performed exactly. The final result, however, will be rounded to + -- an integral multiple of the small (either P_M1 or P_M2, depending on the + -- value of My_Fix'Machine_Rounds). Thus, the value of each constant below + -- will equal that of P_M1 or P_M2. + + Less_Pos_Than_Half : constant My_Fix := P_M1 + ((P_M2 - P_M1)/2.050); + Pos_Exactly_Half : constant My_Fix := P_M1 + ((P_M2 - P_M1)/2.000); + More_Pos_Than_Half : constant My_Fix := P_M1 + ((P_M2 - P_M1)/1.975); + + +-- +-- Negative cases: +-- + + -- -|-------------|-----------------|-------------------|-----------|----| + -- | | | | | | + -- N_M2 More_Neg_Than_Half Neg_Exactly_Half Less_Neg_Than_Half N_M1 0 + + + -- The descriptions for the positive cases above apply to the negative + -- cases below as well. Note that, for N_M2, 'Pred is used rather than + -- 'Succ. Thus, N_M2 is further from 0.0 (i.e. more negative) than N_M1. + + Negative_Real : constant := -467.13988; -- Named number. + Neg_Multiplier : constant := Float'Truncation(Negative_Real/Small); + + Negative_Fixed : constant My_Fix := Negative_Real; + + N_M1 : constant My_Fix := Neg_Multiplier * Small; + N_M2 : constant My_Fix := My_Fix'Pred(N_M1); + + More_Neg_Than_Half : constant My_Fix := N_M1 + ((N_M2 - N_M1)/1.980); + Neg_Exactly_Half : constant My_Fix := N_M1 + ((N_M2 - N_M1)/2.000); + Less_Neg_Than_Half : constant My_Fix := N_M1 + ((N_M2 - N_M1)/2.033); + +end C490002_0; + + + --==================================================================-- + + +with TCTouch; +package body C490002_0 is + + procedure Fixed_Subtest (A, B: in My_Fix; Msg: in String) is + begin + TCTouch.Assert (A = B, Msg); + end Fixed_Subtest; + + procedure Fixed_Subtest (A, B, C: in My_Fix; Msg: in String) is + begin + TCTouch.Assert (A = B or A = C, Msg); + end Fixed_Subtest; + +end C490002_0; + + + --==================================================================-- + + +with C490002_0; -- Fixed point support. +use C490002_0; + +with Report; +procedure C490002 is +begin + Report.Test ("C490002", "Rounding of real static expressions: " & + "ordinary fixed point subtypes"); + + + -- Literal cases: If the named numbers used to initialize Positive_Fixed + -- and Negative_Fixed are rounded to an integral multiple of the small + -- prior to assignment (as expected), then Positive_Fixed and + -- Negative_Fixed are already integral multiples of the small, and + -- equal either P_M1 or P_M2 (resp., N_M1 or N_M2). An equality check + -- can determine in which direction rounding occurred. For example: + -- + -- if (Positive_Fixed = P_M1) then -- Rounding was toward 0.0. + -- + -- Check here that the rounding direction is consistent for literals: + + if (Positive_Fixed = P_M1) then + Fixed_Subtest (0.11433, P_M1, "Positive Fixed: literal"); + else + Fixed_Subtest (0.11433, P_M2, "Positive Fixed: literal"); + end if; + + if (Negative_Fixed = N_M1) then + Fixed_Subtest (-467.13988, N_M1, "Negative Fixed: literal"); + else + Fixed_Subtest (-467.13988, N_M2, "Negative Fixed: literal"); + end if; + + + -- Now check that rounding is performed correctly for values between + -- multiples of the small, according to the value of 'Machine_Rounds: + + if My_Fix'Machine_Rounds then + Fixed_Subtest (Pos_Exactly_Half, P_M1, P_M2, "Positive Fixed: = half"); + Fixed_Subtest (More_Pos_Than_Half, P_M2, "Positive Fixed: > half"); + Fixed_Subtest (Less_Pos_Than_Half, P_M1, "Positive Fixed: < half"); + + Fixed_Subtest (Neg_Exactly_Half, N_M1, N_M2, "Negative Fixed: = half"); + Fixed_Subtest (More_Neg_Than_Half, N_M2, "Negative Fixed: > half"); + Fixed_Subtest (Less_Neg_Than_Half, N_M1, "Negative Fixed: < half"); + else + Fixed_Subtest (Pos_Exactly_Half, P_M1, "Positive Fixed: = half"); + Fixed_Subtest (More_Pos_Than_Half, P_M1, "Positive Fixed: > half"); + Fixed_Subtest (Less_Pos_Than_Half, P_M1, "Positive Fixed: < half"); + + Fixed_Subtest (Neg_Exactly_Half, N_M1, "Negative Fixed: = half"); + Fixed_Subtest (More_Neg_Than_Half, N_M1, "Negative Fixed: > half"); + Fixed_Subtest (Less_Neg_Than_Half, N_M1, "Negative Fixed: < half"); + end if; + + + Report.Result; +end C490002; |