winch: Ensure correct handling of libcalls #7949
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I'm unsure if there's an additional way to test this one aside from the filetests. |
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This commit fixes a fuzz bug where modules involving known libcalls would fail to compile given that they were unconditionally treated as colocated libcalls. This bug is only reproducible in non sse41 environments, given that some operations like `floor` default to libcalls in this case. The `use_colocated_libcalls` setting is not configurable within Wasmtime and as such, they should be loaded into a register prior to emitting the call. This will also ensure that the right 8-byte absolute relocation is used.
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elliottt
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Feb 16, 2024
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This commit fixes a fuzz bug where modules involving known libcalls would fail to compile given that they were unconditionally treated as colocated libcalls.
This bug is only reproducible in non sse41 environments, given that some operations like
floordefault to libcalls in this case. Theuse_colocated_libcallssetting is not configurable within Wasmtime and as such, they should be loaded into a register prior to emitting the call. This will also ensure that the right 8-byte absolute relocation is used.