Displaying 5 results from an estimated 5 matches for "218168".
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21816
2016 May 12
3
Why LR is saved before calling a 'noreturn' function ?
Dear all,
I don't get how llvm handles functions with __attribute__((noreturn)).
It seems that LR register is backed up on the stack whilst it will never be used to return from a 'noreturn' function.
I have this problem with a home-made backend but it seems that ARM flavour of clang has same behaviour.
By the way, SP is also saved, I don't understand why.
Is there a syntax error
2015 Jun 29
2
[LLVMdev] Hwo to guess PC-relative offset
Dear LLVM crew,
I have been writing a new LLVM backend with a very simple instruction set.
moving a constant value to a register is selected as a load of the constant, with a PC-relative positive offset.
Thus, the constant should be stored in .text section, after the load instruction, and offset should be computed at compile time (not link time).
I struggle to find out :
- how llvm handle
2015 Jun 30
2
[LLVMdev] Hwo to guess PC-relative offset
> De : Joerg Sonnenberger [mailto:joerg at britannica.bec.de]
>
> Well, MCFixup is what a relocation is represented as internally. They get
> resolved to a fixed value and replaced, if evaluateAsAbsolute is true.
>
Hi Joerg,
Actually it fails to get resolved to a fixed value.
When I compile to .o then objdump it I can see that a symbol holding the constant value was created in
2015 Jun 29
2
[LLVMdev] Hwo to guess PC-relative offset
> De : Joerg Sonnenberger [mailto:joerg at britannica.bec.de]
>
> The basic idea is to still create a relocation on the MC level, but fix it up later.
> You didn't say if your ISA is fixed or variable length, the former, can simplify
> this quite bit. The constant island pass generally tries to address two issues:
> (1) Merging of identical constants.
> (2) Splitting the
2012 Nov 28
2
[LLVMdev] MIPs backend generates wrong reloc info for static data
Hi all,
I use llvm-clang with a MIPS target, and it seems that the backend generates wrong reloc info.
I attach a very simple test case.
* Compile test.c with 'clang -internal-as -g'
* use mips-elf-objdump -S to get the generate assembly code (see test.lst)
* use mips-elf-readelf -a to look for relocation info (see test.readelf)
All relocations for static data are 0000 ?!
I did not