[all-commits] [llvm/llvm-project] b0f011: [AIX][TLS] Generate 32-bit general-dynamic access ...

[Nemanja Ivanovic via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b0f0115308e4e8692b254c3b0e20f3743616b2d5
      https://github.com/llvm/llvm-project/commit/b0f0115308e4e8692b254c3b0e20f3743616b2d5
  Author: Nemanja Ivanovic <nemanja.i.ibm at gmail.com>
  Date:   2021-03-08 (Mon, 08 Mar 2021)

  Changed paths:
    M llvm/lib/Target/PowerPC/MCTargetDesc/PPCMCTargetDesc.cpp
    M llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp
    M llvm/lib/Target/PowerPC/PPCISelLowering.cpp
    M llvm/lib/Target/PowerPC/PPCISelLowering.h
    M llvm/lib/Target/PowerPC/PPCInstrInfo.td
    M llvm/lib/Target/PowerPC/PPCTLSDynamicCall.cpp
    M llvm/lib/Target/PowerPC/PPCTargetStreamer.h
    M llvm/test/CodeGen/PowerPC/aix-tls-checks.ll
    A llvm/test/CodeGen/PowerPC/aix-tls-gd-double.ll
    A llvm/test/CodeGen/PowerPC/aix-tls-gd-int.ll
    A llvm/test/CodeGen/PowerPC/aix-tls-gd-longlong.ll

  Log Message:
  -----------
  [AIX][TLS] Generate 32-bit general-dynamic access code sequence

Adds support for the TLS general dynamic access model to
assembly files on AIX 32-bit.

To generate the correct code sequence when accessing a TLS variable
`v`, we first create two TOC entry nodes, one for the variable offset, one
for the region handle. These nodes are followed by a `PPCISD::TLSGD_AIX`
node (new node introduced by this patch).
The `PPCISD::TLSGD_AIX` node (`TLSGDAIX` pseudo instruction) is
expanded to 2 copies (to put the variable offset and region handle in
the right registers) and a call to `__tls_get_addr`.

This patch also changes the way TC entries are generated in asm files.
If the generated TC entry is for the region handle of a TLS variable,
we add the `@m` relocation and the `.` prefix to the entry name.
For example:

```
L..C0:
  .tc .v[TC],v[TL]@m -> region handle
L..C1:
  .tc v[TC],v[TL] -> variable offset
```

Reviewed By: nemanjai, sfertile

Differential Revision: https://reviews.llvm.org/D97948