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fix(cpu): restore saved status for test and compare Rd=15 forms

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Restore CPSR from SPSR for ARM TST/TEQ/CMP/CMN with unused Rd=15 when the current mode has an SPSR. Preserve sequential PC and nominal timing; use normal ALU flags in User/System. Keep ordinary result-writing PC return validation unchanged.

Reproduced independent jsmolka/gba-tests ARM failure 234 before this fix. Original regressions cover flags, masks, bank restoration, operand forms, conditions, timing, and atomic errors. The public ROM progresses to a separate unsupported load/writeback alias at test 360; no full public-suite pass is claimed.
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0xrsydn 2026-10-05 20:00:16 +07:00
commit 75fb98bc55
5 changed files with 165 additions and 3 deletions
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2
crates/gba-core/src/cpu.rs
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@ -13,6 +13,8 @@ pub use exception::Exception;
pub use status::Mode;
mod transfer;
#[cfg(test)]
mod compare_psr_tests;
#[cfg(test)]
mod exception_tests;
#[cfg(test)]