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Risc-v: proper management of the return address #939

Merged
merged 2 commits into from
Nov 5, 2024
Merged

Risc-v: proper management of the return address #939

merged 2 commits into from
Nov 5, 2024

Commits on Nov 5, 2024

  1. Revert "Add RA to the list of callee_saved registers." 

    This reverts commit 7a14e76.
    @eponier
    eponier committed Nov 5, 2024
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  2. RISC-V: proper management of the return address 

    On RISC-V, the return address is read from register RA. This was not
reflected in the model and generated wrong programs.

The RAstack case of return_address_location is given an additional
optional argument ra_return that specifies what register to use (if any)
when returning from a function. linearization is adapted to generate the
right code. reg alloc and merge_varmaps take into account this potential
new register.
    @eponier
    eponier committed Nov 5, 2024
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