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-rw-r--r--tests/expr.test124
1 files changed, 122 insertions, 2 deletions
diff --git a/tests/expr.test b/tests/expr.test
index f73c613..ed8f586 100644
--- a/tests/expr.test
+++ b/tests/expr.test
@@ -10,7 +10,7 @@
# See the file "license.terms" for information on usage and redistribution
# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
#
-# RCS: @(#) $Id: expr.test,v 1.68 2007/08/08 20:25:05 dgp Exp $
+# RCS: @(#) $Id: expr.test,v 1.69 2007/08/25 03:23:18 kennykb Exp $
if {[lsearch [namespace children] ::tcltest] == -1} {
package require tcltest 2.1
@@ -983,7 +983,127 @@ test expr-23.47 {INST_EXPON: Bug 1561260} {
test expr-23.48 {INST_EXPON: TIP 274: right assoc} {
expr 2**3**4
} 2417851639229258349412352
-
+test expr-23.49 {INST_EXPON: optimize powers of 2} {
+ set trouble {test powers of 2}
+ for {set tval 0} {$tval <= 66} {incr tval} {
+ set is [expr {2 ** $tval}]
+ set sb [expr {1 << $tval}]
+ if {$is != $sb} {
+ append trouble \n "2**" $tval " is " $is " should be " $sb
+ }
+ if {$tval >= 1} {
+ set is [expr {-2 ** $tval}]
+ set sb [expr {1 << $tval}]
+ if {$tval & 1} {
+ set sb [expr {-$sb}]
+ }
+ if {$is != $sb} {
+ append trouble \n "-2**" $tval " is " $is " should be " $sb
+ }
+ }
+ }
+ set trouble
+} {test powers of 2}
+test expr-23.50 {INST_EXPON: small powers of 32-bit integers} {
+ set trouble {test small powers of 32-bit ints}
+ for {set base 3} {$base <= 45} {incr base} {
+ set sb $base
+ set sbm [expr {-$base}]
+ for {set expt 2} {$expt <= 8} {incr expt} {
+ set sb [expr {$sb * $base}]
+ set is [expr {$base ** $expt}]
+ if {$sb != $is} {
+ append trouble \n $base ** $expt " is " $is " should be " $sb
+ }
+ set sbm [expr {-$sbm * $base}]
+ set ism [expr {(-$base) ** $expt}]
+ if {$sbm != $ism} {
+ append trouble \n - $base ** $expt " is " $ism \
+ " should be " $sbm
+ }
+ }
+ }
+ set trouble
+} {test small powers of 32-bit ints}
+test expr-23.51 {INST_EXPON: intermediate powers of 32-bit integers} {
+ set trouble {test intermediate powers of 32-bit ints}
+ for {set base 3} {$base <= 11} {incr base} {
+ set sb [expr {$base ** 8}]
+ set sbm $sb
+ for {set expt 9} {$expt <= 21} {incr expt} {
+ set sb [expr {$sb * $base}]
+ set sbm [expr {$sbm * -$base}]
+ set is [expr {$base ** $expt}]
+ set ism [expr {-$base ** $expt}]
+ if {$sb != $is} {
+ append trouble \n $base ** $expt " is " $is " should be " $sb
+ }
+ if {$sbm != $ism} {
+ append trouble \n - $base ** $expt " is " $ism \
+ " should be " $sbm
+ }
+ }
+ }
+ set trouble
+} {test intermediate powers of 32-bit ints}
+test expr-23.52 {INST_EXPON: small integer powers with 64-bit results} {
+ set trouble {test small int powers with 64-bit results}
+ for {set exp 2} {$exp <= 16} {incr exp} {
+ set base [expr {entier(pow(double(0x7fffffffffffffff),(1.0/$exp)))}]
+ set sb 1
+ set sbm 1
+ for {set i 0} {$i < $exp} {incr i} {
+ set sb [expr {$sb * $base}]
+ set sbm [expr {$sbm * -$base}]
+ }
+ set is [expr {$base ** $exp}]
+ set ism [expr {-$base ** $exp}]
+ if {$sb != $is} {
+ append trouble \n $base ** $exp " is " $is " should be " $sb
+ }
+ if {$sbm != $ism} {
+ append trouble \n - $base ** $exp " is " $ism " should be " $sbm
+ }
+ incr base
+ set sb 1
+ set sbm 1
+ for {set i 0} {$i < $exp} {incr i} {
+ set sb [expr {$sb * $base}]
+ set sbm [expr {$sbm * -$base}]
+ }
+ set is [expr {$base ** $exp}]
+ set ism [expr {-$base ** $exp}]
+ if {$sb != $is} {
+ append trouble \n $base ** $exp " is " $is " should be " $sb
+ }
+ if {$sbm != $ism} {
+ append trouble \n - $base ** $exp " is " $ism " should be " $sbm
+ }
+ }
+ set trouble
+} {test small int powers with 64-bit results}
+test expr-23.53 {INST_EXPON: intermediate powers of 64-bit integers} {
+ set trouble {test intermediate powers of 64-bit ints}
+ for {set base 3} {$base <= 13} {incr base} {
+ set sb [expr {$base ** 15}]
+ set sbm [expr {-$sb}]
+ for {set expt 16} {$expt <= 39} {incr expt} {
+ set sb [expr {$sb * $base}]
+ set sbm [expr {$sbm * -$base}]
+ set is [expr {$base ** $expt}]
+ set ism [expr {-$base ** $expt}]
+ if {$sb != $is} {
+ append trouble \n $base ** $expt " is " $is " should be " $sb
+ }
+ if {$sbm != $ism} {
+ append trouble \n - $base ** $expt " is " $ism \
+ " should be " $sbm
+ }
+ }
+ }
+ set trouble
+} {test intermediate powers of 64-bit ints}
+
# Some compilers get this wrong; ensure that we work around it correctly
test expr-24.1 {expr edge cases; shifting} {expr int(5)>>32} 0
test expr-24.2 {expr edge cases; shifting} {expr int(5)>>63} 0