Displaying 4 results from an estimated 4 matches for "fixedleninstructiondecoder".
2011 Aug 30
2
[LLVMdev] cortex-m{3,4} special registers
Hi Kurt, Jim,
I took the liberty of working on this today.
The patch has become a bit of a frankenpatch, for the reasons listed out below
and so I won't be able to submit it until tomorrow.
The actual fix itself was very straightforward, but exposed a failing in the
FixedLenInstructionDecoder in that it does not support instruction predicates
such as "IsThumb2".
Generally this is fine, however MRS has different encodings in v{6,7}m and
v{6,7}{a,r} - the encodings are not sufficiently different to deterministically
tell them apart without subtarget specific information.
I can...
2011 Aug 31
0
[LLVMdev] cortex-m{3,4} special registers
...>
> I took the liberty of working on this today.
>
> The patch has become a bit of a frankenpatch, for the reasons listed out below
> and so I won't be able to submit it until tomorrow.
>
> The actual fix itself was very straightforward, but exposed a failing in the
> FixedLenInstructionDecoder in that it does not support instruction predicates
> such as "IsThumb2".
>
> Generally this is fine, however MRS has different encodings in v{6,7}m and
> v{6,7}{a,r} - the encodings are not sufficiently different to deterministically
> tell them apart without subtarget spe...
2011 Aug 29
0
[LLVMdev] cortex-m{3,4} special registers
Hi Kurt,
The assembly parser doesn't (yet) handle these, you're right. Currently, the MRS instruction is split into two variants in the ARMInstrThumb2.td file, t2MRS and t2MRSsys, one for the user mode version reading cpsr and one for the system mode version reading spsr. MSR, by contrast, has a custom parse method for the mask operand since it's a bit more complex than an either/or.
2011 Aug 28
2
[LLVMdev] cortex-m{3,4} special registers
I was attempting to compile some code with a recent (r138716)
version of llvm/clang, targeting a cortex-m4 processor.
And I get an error like this:
CC: sched_garbage.c
In file included from sched_garbage.c:43:
In file included from ./os_internal.h:48:
In file included from /p/nuttx/trunk/nuttx/include/sched.h:47:
In file included from /p/nuttx/trunk/nuttx/include/nuttx/sched.h:54:
In file