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sub               rsp,28
lea               rcx,[@152]
call              printf
lea               rcx,[@154]
mov               edx,13BA
call              printf
xor               eax,eax
add               rsp,28
ret

#13

Bug reports / Re: Some fonts are missing fro...

Last post by Vortex - April 14, 2026, 08:34:57 PM

Hi Timo,

Compiling your code, I get the font not found message on Windows 7 Sp1.

#14

Bug reports / Re: Maybe a optimization bug.

Last post by TimoVJL - April 14, 2026, 07:41:26 PM

For small tests quick look with podump.exe

Disasm obj Add-In

#15

Bug reports / Re: Some fonts are missing fro...

Last post by TimoVJL - April 14, 2026, 07:25:55 PM

Silly example to check if font exists

Code Select

#define WIN32_LEAN_AND_MEAN
#include <windows.h>

int CALLBACK EnumFontFamProc(const LOGFONT *lpelf, const TEXTMETRIC *lpntm,
  DWORD FontType, LPARAM lParam)
{
    static int nCnt;
    OutputDebugString(lpelf->lfFaceName);
    if (!lstrcmp(lpelf->lfFaceName, (TCHAR*)lParam))
        nCnt++;
    return nCnt;
}

void __cdecl WinMainCRTStartup(void)
{
    HDC hDC = GetDC(GetDesktopWindow());
    //int nFont = EnumFontFamilies(hDC, TEXT("Consolas"), EnumFontFamProc, (LPARAM)TEXT("Consolas"));
    int nFont = EnumFontFamilies(hDC, TEXT("Cascadia Mono"), EnumFontFamProc, (LPARAM)TEXT("Cascadia Mono"));
    if (nFont) MessageBox(0, "font found", "Font", MB_OK);
    else MessageBox(0, "font not found", "Font", MB_OK);
    ExitProcess(0);
}

#16

Bug reports / Re: Maybe a optimization bug.

Last post by Vortex - April 14, 2026, 06:06:04 PM

Compiling the code with the maximize speed option :

Code Select

#include <stdio.h>

int main(void)
{
    int i=1, sum=0;
    while (i<=100)
    {
        //printf("i=%d\n",i);
        sum=sum+i;
        i++;
    }
    printf("i=%d\n",i);
    printf("sum=%d\n",sum);
    return 0;
}

Disassembling the object module :

Code Select

_text  SEGMENT PARA 'CODE'                            ; section number 1

main    PROC
        sub    rsp, 40                                ; 0000 _ 48: 83. EC, 28
        lea    rcx, [@152]                            ; 0004 _ 48: 8D. 0D, 00000000(rel)
        call    printf                                  ; 000B _ E8, 00000000(rel)
        lea    rcx, [@154]                            ; 0010 _ 48: 8D. 0D, 00000000(rel)
        mov    edx, 5050                              ; 0017 _ BA, 000013BA
        call    printf                                  ; 001C _ E8, 00000000(rel)
        xor    eax, eax                                ; 0021 _ 31. C0
        add    rsp, 40                                ; 0023 _ 48: 83. C4, 28
        ret                                            ; 0027 _ C3
main    ENDP

_text  ENDS

.xdata  SEGMENT ALIGN(8) 'CONST'                        ; section number 3

..?xdatasym1 label byte
        db 01H, 04H, 01H, 00H, 04H, 42H, 00H, 00H      ; 0000 _ .....B..

.xdata  ENDS

.rdata  SEGMENT PARA 'CONST'                            ; section number 4

@154    label byte
        db 73H, 75H, 6DH, 3DH, 25H, 64H, 0AH, 00H      ; 0000 _ sum=%d..

@152    label byte
        db 69H, 3DH, 25H, 64H, 0AH, 00H                ; 0008 _ i=%d..

.rdata  ENDS

The first printf call should take a second parameter, edx pointint the value of i. Since this statement is missing, printf will print the random value stored by the register edx.

#17

General discussion / Re: Pelles C and Windows Defen...

Last post by Vortex - April 14, 2026, 05:53:10 PM

Hi italofutura,

Timo's suggestion is nice, Pelles C can work like a portable application. Do you have any chances to move temporarily your account to the Administrators group?

#18

Bug reports / Re: Some fonts are missing fro...

Last post by John Z - April 14, 2026, 04:49:07 PM

You could be right, seems like it. Did you check windows settings, personalization, fonts ..... that would be definitive if it is not showing there.

You might try Microsoft Store and see if the font is available to be installed.

John Z

#19

Bug reports / Re: Maybe a optimization bug.

Last post by John Z - April 14, 2026, 04:43:36 PM

Hi ander_cc,

A good lesson there similar to a lawyers credo "In Court don't ask a question if you don't already know the answer" the corollary to teaching, esp programing, is "In classroom don't use an example you haven't tested"

(half kidding you, no offense meant)

But seriously yes there have been, and are issues, with using the optimizations and extensive testing is always needed for these. I have many programs using optimizations successfully.

Perhaps Pelle can find the cause of this short program, meanwhile

Your program can use optimizations by using this 'fix':

volatile int i=1;

which, as I understand it inhibits the optimizer from making assumptions about i.

John Z

As an aside I would recommend not using any optimizations for teaching. Optimizing should be performed by the students learning programing.

Cheers,

#20

Bug reports / Maybe a optimization bug.

Last post by ander_cc - April 14, 2026, 03:38:30 PM

Today, I showed a sample code about while statement to my students. But got a error result.

I think it might be a bug related to optimization. Because when I close optimization, I can get the right value.

Pelles C v14, Windows 11 pro Chinese (Samplify) 25H2
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