Crash when using IEEESPMul

[phx]

I remember that I already ran into that problem nearly 20 years ago, but I'm not sure where it came from.

I am trying to do a simple single-precision multiplication using mathieeesingbas.library:

OpenLibrary     = -552
CloseLibrary    = -414
IEEESPMul       = -78

        code

start:
        move.l  (4).w,a6
        lea     MathSingBasName(pc),a1
        moveq   #37,d0
        jsr     OpenLibrary(a6)
        tst.l   d0
        beq     .exit

        move.l  d0,a6
        move.l  #$437f0000,d0   ; 255.0
        move.l  d0,d1
        jsr     IEEESPMul(a6)

        move.l  a6,a1
        move.l  (4).w,a6
        jsr     CloseLibrary(a6)
        moveq   #0,d0
.exit:  rts

MathSingBasName:
        dc.b    "mathieeesingbas.library",0

The program crashes with a Line-F exception, and further analysis shows the the library's LVO -78 points to $fcac16, where I find this code:

00fcac16 001a 001c                OR.B #$1c,(A2)+
00fcac1a fe5e                     ILLEGAL.L

Looks like it is pointing to trash. Why?

I tested that using UAE with an 68040 and enabled FPU emulation. The ROM is V40.68 for A4000. But the same happens with V40.68 for A1200 (just the address is different: $fc1b92 in this case). SetPatch V40.16 is installed. But same problem without.

With a 68020 or 68030 CPU and 6888x FPU there is no problem.

Is IEEESPMul buggy for 68040/060 in V40.68? Was it fixed by later SetPatch versions?

[StingRay]

I had this problem once too when I changed my Lightwave converter to use the math libraries if no FPU was found. SetPatch 43.6 fixes it! Looks like these routines have been removed from the ROM to save space or something.

[phx]

Ok, thanks. So I remembered right and it is a known bug.

[StingRay]

Yes it is. As far as I remember it only happens with 3.1 ROMS.