MCExpr::print has an optional MCAsmInfo argument, which is error-prone
when omitted. MCExpr::print and the convenience helper operator<< are
discouraged to use. Switch to MCAsmInfo::printExpr instead. Use the
target-specific MCAsmInfo if available.
As noticed in https://github.com/llvm/llvm-project/pull/140471, the
SystemZ target currently implements disassembly of PC-relative target
addresses differently from other back-ends. This patch brings SystemZ in
line with other targets.
Specifically, this patch changes the relevant MCInst instructions to
carry a PC-relative displacement instead of an absolute target address
in their immediate fields. When printing the instruction, this
displacement will either be shown as is (e.g. for llvm-mc), or else
translated into an absolute address at print time (e.g. for
llvm-objdump).
The existing llvm-mc based tests using PC-relative operands no longer
work and have to be rewritten, but printing displacements makes those
tests easier to maintain anyway.
Similar to previous migration done for other targets (PowerPC, X86, ARM,
etc). Switch from the confusing VariantKind to Specifier, which aligns
with Arm and IBM AIX's documentation.
In addition, rename *MCExpr::getKind, which confusingly shadows the base class getKind.
In the future, relocation specifiers should be encoded as part of
SystemZMCExpr instead of MCSymbolRefExpr.
This patch adds support for the next-generation arch15
CPU architecture to the SystemZ backend.
This includes:
- Basic support for the new processor and its features.
- Detection of arch15 as host processor.
- Assembler/disassembler support for new instructions.
- Exploitation of new instructions for code generation.
- New vector (signed|unsigned|bool) __int128 data types.
- New LLVM intrinsics for certain new instructions.
- Support for low-level builtins mapped to new LLVM intrinsics.
- New high-level intrinsics in vecintrin.h.
- Indicate support by defining __VEC__ == 10305.
Note: No currently available Z system supports the arch15
architecture. Once new systems become available, the
official system name will be added as supported -march name.
In preparation for future work on separating the output of the GNU/HLASM
ASM dialects, we first separate the SystemZInstPrinter classes to two
versions, one for each ASM dialect.
The common code remains in a SystemZInstPrinterCommon class instead.
---------
Co-authored-by: Tony Tao <tonytao@ca.ibm.com>
