Message Board
| Message Board > C/C++ > Using C symbols in Dev-CPP inline asm? |
| October 13, 2006, 21:19 | |
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Eckolin
Quite Whiskered 388 posts 
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I'm attempting to improve SGL's speed by using asm for the drawing parts. However, the linker complains about not knowing the symbols I use (TEX, TEXWIDTH and the like). The symbols are private variables of the drawing function. Lastly, I'm using Intel syntax, because the AT&T doesn't look as neat. How do I link things correctly? P.S. Making all variables global is a last resort solution, I'd rather have something neat. [Edited on October 13, 2006 by Eckolin] ____________ Maker of Games... Wisdom is supreme; therefore get wisdom. Need help with coding? I probably wrote something similar. |
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| October 15, 2006, 20:52 | |
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OScoder
None 1338 posts |
Hi. How is it you are trying to use them (could you post the code of what you are doing)? This works for me (AT&T syntax, but it might give the idea): Code: asm volatile("outw %%ax,%%dx \n\t" :: "a"(data), "d"(port)) edit: - ah. Just realised this is gcc inline asm, is it different? [Edited on October 15, 2006 by OScoder] ____________ om |
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| October 15, 2006, 23:25 | |
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Eckolin
Quite Whiskered 388 posts
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It looked something like: Code: asm("MOV si,scount;" // scount here is a local variable. "starttpolyscanlineuz:;" ); The actual code was about 80 lines long. It didn't use extended asm, so no clobbering.  I tested it by turning all variables global, but that didn't work. (Crash when at drawing) Then I noticed that compiling with the -masm=intel tag caused the dll not to work anyway, even without the inline code. Since I didn't want to write it using AT&T style, the inline code is now removed. If necessary, I can post the relevant sgl.c code for someone more experienced to look at. Edit: Cosmetic change. [Edited on October 16, 2006 by Eckolin] ____________ Maker of Games... Wisdom is supreme; therefore get wisdom. Need help with coding? I probably wrote something similar. |
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Message Board > C/C++ > Using C symbols in Dev-CPP inline asm?