[Bug tree-optimization/113467] New: [14 regression] libgcrypt-1.10.3 is miscompiled

[sjames at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113467
            Bug ID: 113467
           Summary: [14 regression] libgcrypt-1.10.3 is miscompiled
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: sjames at gcc dot gnu.org
  Target Milestone: ---

With -O3 -march=znver2 -m32, libgcrypt-1.10.3 is miscompiled on amd64:

```
t-mpi-point: context_alloc: tv[0].'NIST P-521': sample point multiply failed:
          k:
7FFFFFE0003F00000007F00007FFFF80000000001FFC000000FFF030001F03E8FFFFF3E8003803E8000003EA003F0467FFFFF3E8000003E800FFE3E800000000
         Qx:
7CAACB2174E1A97A63BABF4E9E6E82389898A1607E4737672B1070E5F66535E406455BFD70F2EBEEEF3F2DB9303E8DB3941190575849708A456188899714C96E74
expected Qx:
00C1002DC2884EEDADB3F9B468BBEBD55980799852C506D37271FFCD006919DB3A96DF8FE91EF6ED4B9081B1809E8F2C2B28AF5FCBF524147C73CB0B913D6FAB0995
         Qy:
00990438D2386F13AC4FC5BE2F8690FC5BC1B3F5A312FD113D0DF71AD01C755A89C393087575588707247E45C22931BA45B1B9B02BE8049CD2B487CF68666DDD38D2
expected Qy:
01614E8A62C8293DD2AA6EF27D30974A4FD185019FA8EF4F982DA48698CECF706581F69EE9ED67A9C231EC9D0934D0F674646153273BCBB345E923B1EC1386A1A4AD
t-mpi-point: context_alloc: tv[1].'NIST P-521': sample point multiply failed:
          k:
03FFF7FFFFFFFFFFFFFFE007FFFFFFE3FFFFFFFFFC01FFE0001FE02000FFFF000100000100FFFFC00100000080FFFFF040F8000001000000C100000000
         Qx:
00A416B8B436A53456DBB98262BF27B80E80F9F0CA440CE867A80E56B486686837ECC41F557D4098D348EADCB8C9F05AE072EE631CE6979BA63269B698500C8F8002
expected Qx:
0172CD22CBE0634B6BFEE24BB1D350F384A945ED618ECAD48AADC6C1BC0DCC107F0FFE9FE14DC929F90153F390C25BE5D3A73A56F9ACCB0C72C768753869732D0DC4
         Qy:
44D7D325D0CDEB1714AB1EE6BD62A166A2953E9799B706B49917402ACE58FF06CE207022D212958F596B0D94511FD5EC61185B6FF46B9ECBBFFBC6B1806CFCA674
expected Qy:
00D249CFB570DA4CC48FB5426A928B43D7922F787373B6182408FBC71706E7527E8414C79167F3C999FF58DE352D238F1FE7168C658D338F72696F2F889A97DE23C5
FAIL: t-mpi-point
```

Bisect said the first bad commit was one of:
r14-7195-g411de96dbf2bda
r14-7194-g6cb155a6cf3142
r14-7196-g99c0a540d6689e

I can reproduce with:
```
wget https://gnupg.org/ftp/gcrypt/libgcrypt/libgcrypt-1.10.3.tar.bz2
tar xvf libgcrypt-1.10.3.tar.bz2 && cd libgcrypt-1.10.3
./configure --host=i686-pc-linux-gnu --disable-doc CFLAGS="-O3 -march=znver2"
CC="gcc -m32"
make -j$(nproc)
make -j$(nproc) check
```

The 't-mpi-point' test will fail.