David Smith wrote:
> Architecture (example: Intel Pentium) : DEC Alpha
> Operating System (example: Linux 1.3.42 ELF) : Digital UNIX 4.0
> PostgreSQL version (example: Postgres95-1.01) : PostgreSQL-6.1 (3 June)
> Compiler used (example: gcc 2.7.0) : DEC C V5.2-023
> ... the slope of the segment does appear to be an
> issue. If the point is on the segment, that too causes a problem.
I can't get your test case to fail on my i686/Linux machine. I'm very
familiar with Alpha boxes, and haven't noticed anything obvious in the
lseg code causing a problem.
The routines are in src/backend/utils/adt/geo_ops.c, and if you start
putting in printf() statements to narrow down the problem we might have
some luck fixing it. Another possibility is to compile with the flag
"-ieee_noinexact" to suppress floating point traps on underflow and
overflow, but I don't know if that will help.
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