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author | Joel Sherrill <joel.sherrill@OARcorp.com> | 1997-06-03 18:38:40 +0000 |
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committer | Joel Sherrill <joel.sherrill@OARcorp.com> | 1997-06-03 18:38:40 +0000 |
commit | ac953f2429d2d412f137f0d31fabacc376e0d9fd (patch) | |
tree | 0676bf71d1659db72de3256e11d7aae84698659f /c/src/ada-tests/sptests/sp19/README | |
parent | new file (diff) | |
download | rtems-ac953f2429d2d412f137f0d31fabacc376e0d9fd.tar.bz2 |
new files
Diffstat (limited to 'c/src/ada-tests/sptests/sp19/README')
-rw-r--r-- | c/src/ada-tests/sptests/sp19/README | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/c/src/ada-tests/sptests/sp19/README b/c/src/ada-tests/sptests/sp19/README new file mode 100644 index 0000000000..07d60c5bc4 --- /dev/null +++ b/c/src/ada-tests/sptests/sp19/README @@ -0,0 +1,23 @@ +# +# $Id$ +# + +This is a "problem" test in Ada versus the C equivalent. In C, +we used macros to : + + + declare a LOT of local integer and floating point variables + + load them with values + + check them at certain times + + to avoid floating point operations on CPUs w/o hardware support + +The macros are not equivalent to subprograms doing the same thing. +We are trying to insure that the register set is fully utilized and +checking that it survives context switches. If the routines are +subprograms, then calling conventions and scoping rules apply. Thus +the variables do not exist throughout the entire life of the task +as in the C test. + +It seems to point out that although the conditional compilation +and macro capabilities of C are often abused, they do provide +capabilities which are difficult if not impossible to mimic entirely +with subprograms. |