scc crash (register-memory emit for MULSS)

The following code causes scc to crash if compiled using scc with option /64 set and USE_GETTICKCOUNT defined. The code is given by

#include <windows.h>

int myProc(int myParm)
{
#ifdef USE_GETTICKCOUNT
	static float lastTime = GetTickCount() * 0.001f;
#else
	static float lastTime=0.001f;
#endif
	return 0;
}

and it is named 'scc_crash.cpp'. Executing command

scc scc_crash.cpp /64 /DEFINE USE_GETTICKCOUNT

makes scc crash and display the lines

[Silverfrost SCC/WIN32 Ver 4.20 Copyright (c) Silverfrost Ltd 2018]
   0006         static float lastTime = GetTickCount() * 0.001f;
COMMENT - This initialisation will be performed once only
WARNING - 'lastTime' has been given a value, but never used
   0003   int myProc(int myParm)
WARNING - 'myParm' has not been used
   0011   }
*** Failed to do register-memory emit for MULSS at 8
*** Failed to do memory-register emit for MOVSS at 9
    2 ERRORS  [<SCC_CRASH> SCC/WIN32 Ver 4.20]
*** Compilation failed

An object file SCC_CRASH.OBJ is generated, however, its length is 0. An error file for the crash has been created consisting of the lines

Runtime error from program:c:\win32app\silverfrost_8.30\ftn95\scc.exe
Breakpoint
Breakpoint at address 004a8d45

 004a8aed amd_do_type_conversion(<ptr>struct&#9472;tree_record) [+0258]

 004a0c14 AmdCodeGenerator(<ref>struct&#9472;tree_ptr) [+4321]

 004a7418 amd_do_times(<ptr>struct&#9472;tree_record) [+0044]

 004a0c14 AmdCodeGenerator(<ref>struct&#9472;tree_ptr) [+4321]

 004a7a82 amd_do_equals(<ptr>struct&#9472;tree_record) [+0073]

 004a0c14 AmdCodeGenerator(<ref>struct&#9472;tree_ptr) [+4321] [recur=  2] 

 004a837b amd_do_function_top(<ptr>struct&#9472;tree_record) [+0309]

 004a0c14 AmdCodeGenerator(<ref>struct&#9472;tree_ptr) [+4321]

 0048aaf6 code_generator(<ref&÷w>Ysu
eax=0ae09668   ebx=00000005   ecx=00000019
edx=00000007   esi=0ae09688   edi=0000004b
ebp=0377e84c   esp=0377e810   IOPL=0
ds=002b   es=002b   fs=0053
gs=002b   cs=0023   ss=002b
flgs=00000297 [CA EP NZ NS DN NV]

 004a8d45  int    3  
 004a8d46  jmp      4a8e6c 
 004a8d4b  push     0xf0f0f0f0 

. Each of the commands

scc scc_crash.cpp /64
scc scc_crash.cpp /DEFINE USE_GETTICKCOUNT
scc scc_crash.cpp

worked successfully and created an object file SCC_CRASH.OBJ with postive length. This makes me suspect that GetTickCount causes problems for the 64 bit compile.

Regards, Dietmar

Dietmar

A work-around is to cast the return DWORD value of GetTickCount to an int...

   static float lastTime = (int)GetTickCount() * 0.001f; 

The code seems strange to me since I assume the call is made only once when the application is loaded.

Paul,

thanks for the work-around which made the 'critical' sample be compiled successfully. I know that the static declaration had better been moved outside the function. I had given it a chance but the result was the same. Nevertheless this should not matter ... as you said this code (initializing lastTime) should be made only once.

Regards, Dietmar