[all-commits] [llvm/llvm-project] 2cf031: [LoongArch] Move lp64s out of the unimplemented ca...

[Lu Weining via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 2cf0314029804ab467517b390f0fa2a48a34dbe7
      https://github.com/llvm/llvm-project/commit/2cf0314029804ab467517b390f0fa2a48a34dbe7
  Author: Weining Lu <luweining at loongson.cn>
  Date:   2023-05-16 (Tue, 16 May 2023)

  Changed paths:
    M llvm/docs/ReleaseNotes.rst
    M llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp
    A llvm/test/CodeGen/LoongArch/calling-conv-common.ll
    M llvm/test/CodeGen/LoongArch/calling-conv-lp64d.ll
    A llvm/test/CodeGen/LoongArch/calling-conv-lp64s.ll
    M llvm/test/CodeGen/LoongArch/e_flags.ll

  Log Message:
  -----------
  [LoongArch] Move lp64s out of the unimplemented calling conv list

lp64s is same as lp64d execpt that floating point arguments and return
values are always passed via GPRs or stack which means `UseGPRForFloat`
is always `true` in `CC_LoongArch` for lp64s.

One motivation of this change is to build linux which uses
`-msoft-float` and `-mabi=lp64s` [1].

[1]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/loongarch/Makefile?h=v6.4-rc1#n49

Reviewed By: xen0n, hev

Differential Revision: https://reviews.llvm.org/D150417


  Commit: ddb27b1870691595173608ce0c4a0c70ad16513d
      https://github.com/llvm/llvm-project/commit/ddb27b1870691595173608ce0c4a0c70ad16513d
  Author: Weining Lu <luweining at loongson.cn>
  Date:   2023-05-16 (Tue, 16 May 2023)

  Changed paths:
    M clang/lib/Driver/ToolChains/Clang.cpp
    M clang/lib/Driver/ToolChains/Clang.h
    M clang/lib/Driver/ToolChains/Gnu.cpp
    A clang/test/Driver/loongarch-as.s
    A clang/test/Driver/loongarch-ias.s

  Log Message:
  -----------
  [Clang][LoongArch] Pass the -mabi and -target-abi options to as and cc1as respectively

This change is necessary to set correct EFlags according to the
options (-m*-float and -mabi=) passed to clang when input is assembly.

Note: `-mabi=` is not documented by `as`.
```
$ as --version
GNU assembler (GNU Binutils) 2.40.50.20230316
...
$ as --target-help
LARCH options:
```

But we can see gcc invokes `as` and passes the `-mabi=` option when compiling C or assembly.
```
$ gcc -c a.c -v 2>&1 -msoft-float | grep "as -v"
 as -v -mabi=lp64s -o a.o /tmp/ccFrxzZi.s
$ gcc -c a.s -v 2>&1 -msoft-float | grep "as -v"
 as -v -mabi=lp64s -o a.o a.s
```

Reviewed By: xen0n

Differential Revision: https://reviews.llvm.org/D150537


Compare: https://github.com/llvm/llvm-project/compare/8f8479789a08...ddb27b187069