Re: How to add a NOP instruction in each basic block for obj code that gcc generates

Jeff wrote: I added fprintf (asm_out_file, "\tnop\n"); to the end of case CODE_LABEL. Then I recompile the gcc. Unfortunately, it doesn't seem that a NOP was inserted. Any ideaes? What testcase did you try? Not every basic block starts with a label. Only basic blocks that are the target of

Re: How to add a NOP instruction in each basic block for obj code that gcc generates

Jeff <[EMAIL PROTECTED]> writes: > > The simplest way is going to be something like > >fprintf (asm_out_file, "\tnop\n"); > > I added fprintf (asm_out_file, "\tnop\n"); to the end of case > CODE_LABEL. Then I recompile the gcc. Unfortunately, it doesn't seem > that a NOP was inserted. Any

Re: How to add a NOP instruction in each basic block for obj code that gcc generates

The simplest way is going to be something like fprintf (asm_out_file, "\tnop\n"); I added fprintf (asm_out_file, "\tnop\n"); to the end of case CODE_LABEL. Then I recompile the gcc. Unfortunately, it doesn't seem that a NOP was inserted. Any ideaes? case CODE_LABEL: /* The target

Re: How to add a NOP instruction in each basic block for obj code that gcc generates

Jeff <[EMAIL PROTECTED]> writes: > Which function should I use in order to emit a nop? The simplest way is going to be something like fprintf (asm_out_file, "\tnop\n"); Ian

Re: How to add a NOP instruction in each basic block for obj code that gcc generates

If you don't want to change the generated code other than inserting the nops, and you can restrict yourself to a processor which does not need to track addresses to avoid out-of-range branches, then you could approximate what you want by emitting a nop in final_scan_insn when you see a CODE_LABEL,

Re: How to add a NOP instruction in each basic block for obj code that gcc generates

Jeff <[EMAIL PROTECTED]> writes: > It would be cleaner if I know how to modify the gcc source code and > let it insert a nop to each basic block. This shouldn't be a hard job > for an experienced gcc developer, should this? It's doable but it's probably harder than you seem to think it is. gcc i

Re: How to add a NOP instruction in each basic block for obj code that gcc generates

2006/8/10, Paolo Bonzini <[EMAIL PROTECTED]>: jeff jeff wrote: > Hi all, > > I'm doing an experiment with gcc. I need to modify gcc so that a NOP > instruction will be inserted into each basic block in binary code that > gcc generates. I know this sounds weird but it is part of my > experiment.

Re: How to add a NOP instruction in each basic block for obj code that gcc generates

jeff jeff wrote: Hi all, I'm doing an experiment with gcc. I need to modify gcc so that a NOP instruction will be inserted into each basic block in binary code that gcc generates. I know this sounds weird but it is part of my experiment. As I'm unfamiliar with gcc, is there someone willing to