search for: label_bb5

...ecause I want to temporarily change the flow at runtime and then to restore the previous version. In order to patch, I need to know the exact structure of the generated code. So, I might have a BasicBlock like: BB4: call void asm "label_BB4:\0A", ""() call void asm "jmp label_BB5\0A", ""() br label %BB5 and in the generated code the br label %BB5 will actually never be reached. But I introduce the jmp in inline asm in hexa code with .byte in order to control if it is a long or a short jump and to know how many bytes to patch. I tried to keep it short, plea...

Hello- Doing control-flow (jumps and/or labels) in inline asm is a really bad idea. What are you trying to achieve? Alistair On 24 Jun 2010, at 12:54, Xinfinity wrote: > > Hi LLVM-devs, > > I am looking for a way to prevent an instruction to be executed more than > once, or duplicated .. I know that by default everything can be duplicated, > but is there a work-around? >

...ntime and > then to > restore the previous version. > > In order to patch, I need to know the exact structure of the > generated code. > So, I might have a BasicBlock like: > > BB4: > call void asm "label_BB4:\0A", ""() > call void asm "jmp label_BB5\0A", ""() > br label %BB5 You can't prevent various optimizations from making multiple copies of asm's. Also, branches from one asm to another, or into or out of an asm, do not work, in general. All of this is the same as gcc. I'm not sure if a branch within t...

Hi LLVM-devs, I am looking for a way to prevent an instruction to be executed more than once, or duplicated .. I know that by default everything can be duplicated, but is there a work-around? The structure of the code is BB1 BB2 | | | | | | |----------| | v BB3 where the first instruction in BB3 is inserting an inline assembly