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# 00dfd4f8 29-May-2021 Jessica Clarke <[email protected]>

Revert "[RISCV] Remove -riscv-no-aliases in favour of new -M no-aliases"

The replacement doesn't work for llc, but it is needed by
patchable-function-entry.ll.

This reverts commit aa9a30b83a06e3e5e

Revert "[RISCV] Remove -riscv-no-aliases in favour of new -M no-aliases"

The replacement doesn't work for llc, but it is needed by
patchable-function-entry.ll.

This reverts commit aa9a30b83a06e3e5e68e32ea645ec2d9edc27efc.

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# aa9a30b8 29-May-2021 Jessica Clarke <[email protected]>

[RISCV] Remove -riscv-no-aliases in favour of new -M no-aliases

Whilst here, also remove a couple of unnecessary -o - instances.

Reviewed By: MaskRay

Differential Revision: https://reviews.llvm.or

[RISCV] Remove -riscv-no-aliases in favour of new -M no-aliases

Whilst here, also remove a couple of unnecessary -o - instances.

Reviewed By: MaskRay

Differential Revision: https://reviews.llvm.org/D103201

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Revision tags: llvmorg-12.0.1-rc1, llvmorg-12.0.0, llvmorg-12.0.0-rc5, llvmorg-12.0.0-rc4
# 6ab89279 16-Mar-2021 Fangrui Song <[email protected]>

[RISCV] Support clang -fpatchable-function-entry && GNU function attribute 'patchable_function_entry'

Similar to D72215 (AArch64) and D72220 (x86).

```
% clang -target riscv32 -march=rv64g -c -fpat

[RISCV] Support clang -fpatchable-function-entry && GNU function attribute 'patchable_function_entry'

Similar to D72215 (AArch64) and D72220 (x86).

```
% clang -target riscv32 -march=rv64g -c -fpatchable-function-entry=2 a.c && llvm-objdump -dr a.o
...
0000000000000000 <main>:
0: 13 00 00 00 nop
4: 13 00 00 00 nop

% clang -target riscv32 -march=rv64gc -c -fpatchable-function-entry=2 a.c && llvm-objdump -dr a.o
...
00000002 <main>:
2: 01 00 nop
4: 01 00 nop
```

Recently the mainline kernel started to use -fpatchable-function-entry=8 for riscv (https://git.kernel.org/linus/afc76b8b80112189b6f11e67e19cf58301944814).

Differential Revision: https://reviews.llvm.org/D98610

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