Ticket #71 (closed defect: fixed)

Opened 18 months ago

Last modified 18 months ago

NOT-MORE-CONTAGIOUS broken for double-double-floats

Reported by: rtoy Owned by: somebody
Priority: major Milestone:
Component: Core Version: 2013-01
Keywords: Cc:

Description

Here is an example of the brokenness:

(defun foo (x)
  (declare (type double-float x))
  (expt x 2w0))

(compile 'foo)

(foo 2d0)

Invalid number of arguments: 1
   [Condition of type KERNEL:SIMPLE-PROGRAM-ERROR]

This is a bug in NOT-MORE-CONTAGIOUS returning the wrong value. The power should cause result of EXPT to be a double-double-float, but the the deftransform just converts the call to a multiplication of two double-floats. This mismatch of the actual type and the derived type confuses the compiler and causes the weird error.

Change History

Changed 18 months ago by toy.raymond@…

  • status changed from new to closed
  • resolution set to fixed

commit b2ee65dabba1742203e28f538eeee59da126093c Author: Raymond Toy <toy.raymond@…> Date: Thu Jan 24 20:28:09 2013 -0800

Fix ticket:71

The reader conditionals in NOT-MORE-CONTAGIOUS were incorrrectly handling the case when the second type was a double-float. It was always returning T in that case, but this is wrong if the first type is a double-double-float.

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