The register list in vscclrm is unusual in three ways:
* The encoded size can be zero, meaning the list contains only vpr.
* Double-precision registers past d15 are permitted even when the
subtarget doesn't have them, they are instead ignored when the
instruction executes.
* The single-precision variant allows double-precision registers d16
onwards, which are encoded as a pair of single-precision registers.
Fixing this also incidentally changes a vlldm/vlstm error message: when
the first register is in the range d16-d31 we now get the "operand must
be exactly..." error instead of "register expected".
This fixes all the places that hit the new assertion added in
https://github.com/llvm/llvm-project/pull/106524 in tests. That is,
cases where the value passed to the APInt constructor is not an N-bit
signed/unsigned integer, where N is the bit width and signedness is
determined by the isSigned flag.
The fixes either set the correct value for isSigned, set the
implicitTrunc flag, or perform more calculations inside APInt.
Note that the assertion is currently still disabled by default, so this
patch is mostly NFC.
We can convert the MCRegister to bool instead. I think this should
allows us to remove MCRegister::operator==(int). All other comparisons
in tree are unsigned.
S.substr(N) is simpler than S.slice(N, StringRef::npos) and
S.slice(N, S.size()). Also, substr is probably better recognizable
than slice thanks to std::string_view::substr.
This was broken by https://github.com/llvm/llvm-project/pull/83436 as in
optional operands meant when the CC operand is provided the
`parsePKHImm` parser is applied to register operands, which previously
erroneously produced an error.
This changs the way the assembly matcher works for Aarch32 parsing.
Previously there was a pile of hacks which dictated whether the CC,
CCOut, and VCC operands should be present which de-facto chose if the
wide/narrow (or thumb1/thumb2/arm) instruction version were chosen.
This meant much of the TableGen machinery present for the assembly
matching was effectively being bypassed and worked around.
This patch makes the CC and CCOut operands optional which allows the ASM
matcher operate as it was designed and means we can avoid doing some of
the hacks done previously. This also adds the option for the target to
allow the prioritizing the smaller instruction encodings as is required
for Aarch32.
Re-land 634b0243b8f7acc85af4f16b70e91d86ded4dc83.
T1 allow for an optional registers list,
the register list must be {d0-d15}.
T2 define a mandatory register list,
the register list must be {d0-d31}.
The requirements for T1/T2 are as follows:
T1 T2
Require: v8-M.Main, v8.1-M.Main,
secure state secure state
16 D Regs valid valid
32 D Regs UNDEFINED valid
No D Regs NOP NOP
This changes the type of `PredicationCode` and `VPTPredicationCode` from
`unsigned` to `ARMCC::CondCodes` and `ARMVCC::VPTCodes` resp' for
clarity and correctness.
T1 allows for an optional registers list, the register list must be {d0-d15}.
T2 defines a mandatory register list, the register list must be {d0-d31}.
The requirements for T1/T2 are as follows:
T1 T2
Require: v8-M.Main, v8.1-M.Main,
secure state secure state
16 D Regs valid valid
32 D Regs UNDEFINED valid
No D Regs NOP NOP
Linux kernel fs/binfmt_elf_fdpic.c supports FDPIC for MMU-less systems.
GCC/binutils/qemu support FDPIC ABI for ARM
(https://github.com/mickael-guene/fdpic_doc).
_ARM FDPIC Toolchain and ABI_ provides a summary.
This patch implements FDPIC relocations to the integrated assembler.
There are 6 static relocations and 2 dynamic relocations, with
R_ARM_FUNCDESC as both static and dynamic.
gas requires `--fdpic` to assemble data relocations like `.word f(FUNCDESC)`.
This patch adds `MCTargetOptions::FDPIC` and reports an error if FDPIC
is not set.
Pull Request: https://github.com/llvm/llvm-project/pull/82187
This avoids possible undefined behavior using the same register for Rm
and Rda.
Additionally adds a check in MC to produce an error upon parsing this
case.
This patch replaces uses of StringRef::{starts,ends}with with
StringRef::{starts,ends}_with for consistency with
std::{string,string_view}::{starts,ends}_with in C++20.
I'm planning to deprecate and eventually remove
StringRef::{starts,ends}with.
The floating-point and MVE features together specify the MVE
functionality that is supported on the Cortex-M85 processor. But the FPU
extension for the underlying architecture(armv8.1-m.main) is FPV5 which
does not include MVE-F. So Compiler's -S output and `-save-temps=obj`
loses MVE feature which leads to assembler error. What happening here is
.fpu directive overrides any previously set features by .cpu directive.
Since the the corresponding .fpu generated (.fpu fpv5-d16) does not
include MVE-F, it overrides those features even though it is supported
and set by the .cpu directive. Looks like .fpu is supposed to do this.
In this case, there should be an .arch_extension directive re-enabling
the relevant extensions after .fpu if the goal is to keep these
extensions enabled. GCC also does the same.
So this patch enables the MVE features by emitting the below arch
extension:
.fpu fpv5-d16
.arch_extension mve.fp
---------
Co-authored-by: Simi Pallipurath <simi.pallipurath.com>
Advance the IT and VPT block state when parsing the .inst directive, so
that it is possible to use them to emit conditional instructions. If we
don't do this, then a later instruction inside or just after the block
will have a mis-matched condition, so be incorrectly reported as an
error.
This finishes the work of replacing OperandMatchResultTy with
ParseStatus, started in D154101.
As a drive-by change, rename some RegNo variables to just Reg
(a leftover from the days when RegNo had 'unsigned' type).
ParseStatus is slightly more convenient to use due to implicit
conversion from bool, which allows to do something like:
```
return Error(L, "msg");
```
when with MatchOperandResultTy it had to be:
```
Error(L, "msg");
return MatchOperand_ParseFail;
```
It also has more appropriate name since parse* methods are not only for
parsing operands.
Reviewed By: olista01
Differential Revision: https://reviews.llvm.org/D154304
SubtargetFeature.h is currently part of MC while it doesn't depend on
anything in MC. Since some LLVM components might have the need to work
with target features without necessarily needing MC, it might be
worthwhile to move SubtargetFeature.h to a different location. This will
reduce the dependencies of said components.
Note that I choose TargetParser as the destination because that's where
Triple lives and SubtargetFeatures feels related to that.
This issues came up during a JITLink review (D149522). JITLink would
like to avoid a dependency on MC while still needing to store target
features.
Reviewed By: MaskRay, arsenm
Differential Revision: https://reviews.llvm.org/D150549
This patch adds the LLVM-side plumbing for the following relocations:
- R_ARM_THM_ALU_ABS_G0_NC
- R_ARM_THM_ALU_ABS_G1_NC
- R_ARM_THM_ALU_ABS_G2_NC
- R_ARM_THM_ALU_ABS_G3
(see section 5.6.1.5, Static Thumb16 relocations, of the AArch32 ELF Arm ABI:
844a79fd4c/aaelf32/aaelf32.rst (5615static-thumb16-relocations))
Which can respectivly be generated by prefixing assembly symbols with:
- :lower0_7:
- :lower8_15:
- :upper0_7:
- :upper8_15:
LLD support for these relocations will be added in a follow-up patch
Reviewed By: john.brawn, MaskRay
Differential Revision: https://reviews.llvm.org/D149443
Emit a 4-byte alignment after the .arm directive and a 2-byte alignment
after the .thumb directive. The new behavior matches GNU assembler.
Fixes#53386
Reviewed By: MaskRay
Differential Revision: https://reviews.llvm.org/D147763
The last uses were removed by:
commit 772e4931932270a82f38c83d4344c800b2f54eff
Author: Simon Tatham <simon.tatham@arm.com>
Date: Thu Jan 23 11:53:27 2020 +0000
Differential Revision: https://reviews.llvm.org/D151299
This patch migrates uses of StringRef::{starts,ends}with_insensitive
to StringRef::{starts,ends}_with_insensitive so that we can use names
similar to those used in std::string_view. I'm planning to deprecate
StringRef::{starts,ends}with_insensitive once the migration is
complete across the code base.
Differential Revision: https://reviews.llvm.org/D150426
This shrinks MCInstrDesc (and hence the whole TargetInsts table) because
we can store a 16-bit offset value to access the implicit operands,
instead of a pointer. This also reduces the number of relocs that need
to be applied when LLVM is compiled as position-independent code.
Differential Revision: https://reviews.llvm.org/D142218
Fixes#61607
Several names were repeated in this giant list. I have refactored
it and removed the duplicates.
Reviewed By: dmgreen
Differential Revision: https://reviews.llvm.org/D146619
Some memory instructions in the following sections of Armv7-M ARM allow
the .w mnemonic suffix, even though the preferred disassembly is without
the suffix.
A7.7.46 LDRB (immediate) T3
A7.7.55 LDRH (immediate) T3
A7.7.59 LDRSB (immediate) T2
A7.7.63 LDRSH (immediate) T2
A7.7.163 STRB (immediate) T3
A7.7.170 STRH (immediate) T3
This patch accepts the .w suffixes for theses instructions.
Pseudo-instructions and custom parsing logic are used instead of simple
aliases. More discussions are in these relevant patches:
https://reviews.llvm.org/D68916https://reviews.llvm.org/D96632
Differential Revision: https://reviews.llvm.org/D142980
