According to the description of the psABI v2.20:
https://github.com/loongson/la-abi-specs/releases/tag/v2.20, adjustments
are made to the function call instructions under the medium code model.
At the same time, AsmParser has already supported parsing the call36 and
tail36 macro instructions.
This is intended to behave like GCC's `-mcmodel=extreme`.
Technically the true GCC equivalent would be `-mcmodel=large` which is
not yet implemented there, and we probably do not want to take the
"Large" name until things settle in GCC side, but:
* LLVM does not have a `CodeModel::Extreme`, and it seems too early to
have such a variant added just for enabling LoongArch; and
* `CodeModel::Small` is already being used for GCC `-mcmodel=normal`
which is already a case of divergent naming.
Regarding the codegen, loads/stores immediately after a PC-relative
large address load (that ends with something like `add.d $addr, $addr,
$tmp`) should get merged with the addition into corresponding `ldx/stx`
ops, but is currently not done. This is because pseudo-instructions are
expanded after instruction selection, and is best fixed with a separate
change.
Reviewed By: SixWeining
Differential Revision: https://reviews.llvm.org/D150522
There are static and dynamic TLS address lowering in DAG stage according
to different TLS models.
TLS address will be lowered to pseudo instruction and then expanded by
the `LoongArch Pre-RA pseudo instruction expansion` pass.
Differential Revision: https://reviews.llvm.org/D134713
This patch uses a unified interface for lower GlobalAddress ConstantPool
BlockAddress and JumpTable.
This patch allows lowering addresses by using PC-relative addressing
for DSO-local symbols, and accessing the address through the global
offset table for DSO-preemptable symbols.
Remove hardcoded `MininumJumpTableEntries` for test lower JumpTable.
Also updated some test cases using ConstantPool, due to the addition of
relocation information.
Differential Revision: https://reviews.llvm.org/D134431
This patch makes the assembler support all modifiers defined in gnu-as.
Also changes some diagnostic information.
Differential Revision: https://reviews.llvm.org/D132633
This patch only add %pc_hi20/%pc_lo12/%plt relocations in order
to be able to generate gnu ld linkable relocation file for the
`hello world` IR :
```
@.str = private unnamed_addr constant [14 x i8] c"Hello world!\0A\00", align 1
define dso_local signext i32 @main() nounwind {
entry:
%call = call signext i32 (ptr, ...) @printf(ptr noundef @.str)
ret i32 0
}
declare dso_local signext i32 @printf(ptr noundef, ...)
```
This patch also updates some test cases due to new modifiers introduced.
New test: test/MC/LoongArch/Relocations/relocations.s
Differential Revision: https://reviews.llvm.org/D132108
These operations include sdiv/udiv/srem/urem.
As the ISA [https://loongson.github.io/LoongArch-Documentation/LoongArch-Vol1-EN.html#_div_wudu_mod_wudu]
described, when the divisor is 0, the result can be any value, but no
exception will be triggered. Unlike gcc, which by default emit code
that checks divide-by-zero after the division or modulus instruction,
we only emit this check when the `-loongarch-check-zero-division`
option is passed.
Differential Revision: https://reviews.llvm.org/D128572
This patch introduces basic tablegen infra such as
LoongArch{InstrFormats,InstrInfo,RegisterInfo,CallingConv,}.td.
For now, only add instruction definitions for LoongArch basic integer
operations.
Our initial target is a working MC layer rather than codegen,
so appropriate SelectionDAG patterns will come later.
Differential revision: https://reviews.llvm.org/D115861
