Jacob Pratt
0de2341fef
Mark condition/carry bit as clobbered in C-SKY inline assembly C-SKY's compare and some arithmetic/logical instructions modify condition/carry bit (C) in PSR, but there is currently no way to mark it as clobbered in `asm!`. This PR marks it as clobbered except when [`options(preserves_flags)`](https://doc.rust-lang.org/reference/inline-assembly.html#r-asm.options.supported-options.preserves_flags) is used. Refs: - Section 1.3 "Programming model" and Section 1.3.5 "Condition/carry bit" in CSKY Architecture user_guide: https://github.com/c-sky/csky-doc/blob/9f7121f7d40970ba5cc0f15716da033db2bb9d07/CSKY%20Architecture%20user_guide.pdf > Under user mode, condition/carry bit (C) is located in the lowest bit of PSR, and it can be accessed and changed by common user instructions. It is the only data bit that can be visited under user mode in PSR. > Condition or carry bit represents the result after one operation. Condition/carry bit can be clearly set according to the results of compare instructions or unclearly set as some high-precision arithmetic or logical instructions. In addition, special instructions such as DEC[GT,LT,NE] and XTRB[0-3] will influence the value of condition/carry bit. - Register definition in LLVM: https://github.com/llvm/llvm-project/blob/llvmorg-19.1.0/llvm/lib/Target/CSKY/CSKYRegisterInfo.td#L88 cc ```@Dirreke``` ([target maintainer](https://github.com/rust-lang/rust/blob/aa6f5ab18e67cb815f73e0d53d217bc54b0da924/src/doc/rustc/src/platform-support/csky-unknown-linux-gnuabiv2.md#target-maintainers)) r? ```@Amanieu``` ```@rustbot``` label +O-csky +A-inline-assembly
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