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| author | Xavier Leroy <xavier.leroy@college-de-france.fr> | 2021-09-23 15:33:06 +0200 |
|---|---|---|
| committer | Xavier Leroy <xavier.leroy@college-de-france.fr> | 2021-09-23 15:33:06 +0200 |
| commit | c8ccecc783671fb699a33f432c34e3c1cd1dc801 (patch) | |
| tree | 040fc679cf59c9842e3b4963769ba7277f97300b /aarch64 | |
| parent | 9e30fa95607cf357ab7c18a4773edf6b6f84c7d7 (diff) | |
| download | compcert-kvx-c8ccecc783671fb699a33f432c34e3c1cd1dc801.tar.gz compcert-kvx-c8ccecc783671fb699a33f432c34e3c1cd1dc801.zip | |
For __builtin_memcpy_aligned, watch out for alignment of stack offsets
Stack offsets must be multiple of 8 when using ldp/stp instructions
and multiple of the transferred size when using other load/store
instructions with offsets greater than 256.
For simplicity, always require that the offset is multiple of 8.
Fixes: #410
Diffstat (limited to 'aarch64')
| -rw-r--r-- | aarch64/Asmexpand.ml | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/aarch64/Asmexpand.ml b/aarch64/Asmexpand.ml index d24a9ef6..6c58e075 100644 --- a/aarch64/Asmexpand.ml +++ b/aarch64/Asmexpand.ml @@ -185,6 +185,7 @@ let memcpy_small_arg sz arg tmp = | BA_addrstack ofs -> if offset_in_range ofs && offset_in_range (Ptrofs.add ofs (Ptrofs.repr (Z.of_uint sz))) + && Int64.rem (Z.to_int64 ofs) 8L = 0L then (XSP, ofs) else begin expand_addimm64 (RR1 tmp) XSP ofs; (RR1 tmp, _0) end | _ -> |