| Issue |
126516
|
| Summary |
[clang] __iso_volatile_load64/store64 not atomic on i386-windows
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
iamahuman
|
__iso_volatile_load64/store64 are used for 64-bit atomic access on i386:
https://github.com/microsoft/STL/blob/c10ae01b4d9508eed9d5f059a120ee7223b6ac12/stl/inc/atomic#L840-L849
https://github.com/microsoft/STL/blob/c10ae01b4d9508eed9d5f059a120ee7223b6ac12/stl/inc/atomic#L804-L825
However, clang splits __iso_volatile_load64/store64 into two consecutive volatile 32-bit accesses, which diverges from MSVC which uses FILD/FISTP.
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