[all-commits] [llvm/llvm-project] d6a48a: [RISCV] Fix the CFI offset for callee-saved regist...

[Jim Lin via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: d6a48a348ad0096e1e97dadaa6dcbeaf49db718b
      https://github.com/llvm/llvm-project/commit/d6a48a348ad0096e1e97dadaa6dcbeaf49db718b
  Author: Jim Lin <jim at andestech.com>
  Date:   2023-08-02 (Wed, 02 Aug 2023)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVFrameLowering.cpp
    M llvm/test/CodeGen/RISCV/push-pop-popret.ll

  Log Message:
  -----------
  [RISCV] Fix the CFI offset for callee-saved registers stored by Zcmp push.

Issue mentioned: https://github.com/riscv/riscv-code-size-reduction/issues/182

The order of callee-saved registers stored by Zcmp push in memory is reversed.

Pseudo code for cm.push in https://github.com/riscv/riscv-code-size-reduction/releases/download/v1.0.4-1/Zc.1.0.4-1.pdf

```
if (XLEN==32) bytes=4; else bytes=8;

addr=sp-bytes;
for(i in 27,26,25,24,23,22,21,20,19,18,9,8,1)  {
  //if register i is in xreg_list
  if (xreg_list[i]) {
    switch(bytes) {
      4:  asm("sw x[i], 0(addr)");
      8:  asm("sd x[i], 0(addr)");
    }
    addr-=bytes;
  }
}
```

The placement order for push is s11, s10, ..., ra.

CFI offset should be calculed as reversed order for correct stack unwinding.

Reviewed By: fakepaper56, kito-cheng

Differential Revision: https://reviews.llvm.org/D156437