[Vm-dev] Building and running Cog VM in "good old" athlon-xp without SSE2 support still fails

[oslsachem]

I have successfully built the Cog VM for debugging (make debug) using
the standalone (without Cygwin) MinGW/MSYS environment.

This has been for an athlon-xp using revision 3164.

I have attached a patch with the modifications I have had to make to
the makefiles just for reference (MinGWTuning.patch).

However, the VM fails when loading the image, prompting a system error.

I have used the GNU debugger (gdb) to isolate the problematic function
call ( which apparently contains an instruction not supported by the
hardware).

[...]

(gdb)
updateMicrosecondClock () at ../../platforms/win32/vm/sqWin32Heartbeat.c:202
202        if (!asserta(newUtcMicrosecondClock >= utcMicrosecondClock)) {
(gdb)
206        newLocalMicrosecondClock = newUtcMicrosecondClock + vmGMTOffset;
(gdb)
208        set64(utcMicrosecondClock,newUtcMicrosecondClock);
(gdb)

Program received signal SIGILL, Illegal instruction.
0x00474dee in updateMicrosecondClock ()
    at ../../platforms/win32/vm/sqWin32Heartbeat.c:208
208        set64(utcMicrosecondClock,newUtcMicrosecondClock);

[...]

I have attached the log of the build of the VM for debugging (LOGD)
and the debugging session (logGDB).


On the other hand, using explicitly the -mno-sse2 or -march=native
switches makes the build fail around the same piece of code:

[...]

../../platforms/win32/vm/sqWin32Heartbeat.c: In function

'updateMicrosecondClock':../../platforms/win32/vm/sqWin32Heartbeat.c:208:2:
error: can't find a register in class

'GENERAL_REGS' while reloading
'asm'../../platforms/win32/vm/sqWin32Heartbeat.c:209:2: error: can't
find a register in class

'GENERAL_REGS' while reloading
'asm'../../platforms/win32/vm/sqWin32Heartbeat.c:208:2: error: 'asm'
operand has impossible

constraints../../platforms/win32/vm/sqWin32Heartbeat.c:209:2: error:
'asm' operand has impossible constraintsmake[1]: ***

[builddbg/vm/sqWin32Heartbeat.o] Error 1
make[1]: Leaving directory `/c/Documents and Settings/Usuario/Mis
documentos/cog/build.win32x86/squeak.cog.v3'
make: *** [debug] Error 2

[...]


Greetings,
    Osl
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