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| author | dkf <donal.k.fellows@manchester.ac.uk> | 2002-01-24 20:34:49 (GMT) |
|---|---|---|
| committer | dkf <donal.k.fellows@manchester.ac.uk> | 2002-01-24 20:34:49 (GMT) |
| commit | 2720d411cf7260e87ce6e6e641a576c57ef3e046 (patch) | |
| tree | 16f082aba4b3ed3d112ea9b328975688754dcb94 /tests | |
| parent | cb09c58ac476c67cd1208b8cdc82cd5351f74f14 (diff) | |
| download | tcl-dkf_64bit_support_branch.zip tcl-dkf_64bit_support_branch.tar.gz tcl-dkf_64bit_support_branch.tar.bz2 | |
Added test for meaning of tcl_platform(wordSize)
dkf_64bit_support_branch
Diffstat (limited to 'tests')
| -rw-r--r-- | tests/platform.test | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/tests/platform.test b/tests/platform.test index 288cc72..19001ee 100644 --- a/tests/platform.test +++ b/tests/platform.test @@ -25,6 +25,17 @@ test platform-1.1 {TclpSetVariables: tcl_platform} { set result } {byteOrder machine os osVersion platform user wordSize} +# Test assumes twos-complement arithmetic, which is true of virtually +# everything these days. Note that this does *not* use wide(), and +# this is intentional since that could make Tcl's numbers wider than +# the machine-integer on some platforms... +test platform-2.1 {tcl_platform(wordSize) indicates size of native word} { + set result [expr {1 << (8 * $tcl_platform(wordSize) - 1)}] + # Result must be the largest bit in a machine word, which this checks + # without assuming how wide the word really is + list [expr {$result < 0}] [expr {$result ^ ($result - 1)}] +} {1 -1} + # cleanup ::tcltest::cleanupTests return |