[PATCH v2 0/2] When cmodel=extreme, add macro support and only support macros.

[Lulu Cheng <chenglulu@loongson.cn>]

When cmodel=extreme, since the symbol address is obtained through four instructions,
errors may occur in some cases during linking. Therefore, in order to ensure that
the instructions for obtaining the symbol address are together, macro instructions
are used to obtain the symbol address when cmodel=extreme.

https://github.com/loongson/la-abi-specs/blob/release/laelf.adoc#extreme-code-model

v1 -> v2:
  1. Use the temporarily allocated registers as intermediate registers to implement the extreme macro.
  2. Fixed bugs in v1 test cases.

Lulu Cheng (2):
  LoongArch: Add the macro implementation of mcmodel=extreme.
  LoongArch: When the code model is extreme, the symbol address is
    obtained through macro instructions regardless of the value of
    -mexplicit-relocs.

 gcc/config/loongarch/loongarch.cc             | 39 +++++++++------
 gcc/config/loongarch/loongarch.md             | 50 +++++++++++++++++++
 gcc/config/loongarch/predicates.md            | 14 ++++++
 .../gcc.target/loongarch/attr-model-1.c       |  2 +-
 .../gcc.target/loongarch/attr-model-2.c       |  2 +-
 .../gcc.target/loongarch/attr-model-3.c       |  2 +-
 .../gcc.target/loongarch/attr-model-4.c       |  2 +-
 .../loongarch/func-call-extreme-1.c           |  6 +--
 .../loongarch/func-call-extreme-2.c           |  6 +--
 .../loongarch/func-call-extreme-3.c           |  6 +--
 .../loongarch/func-call-extreme-4.c           |  6 +--
 .../loongarch/func-call-extreme-5.c           |  7 +++
 .../loongarch/func-call-extreme-6.c           |  7 +++
 13 files changed, 118 insertions(+), 31 deletions(-)
 create mode 100644 gcc/testsuite/gcc.target/loongarch/func-call-extreme-5.c
 create mode 100644 gcc/testsuite/gcc.target/loongarch/func-call-extreme-6.c

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2.39.3