Specify can_branch and decode the sret instruction #443
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@henrybear327, The item |
@jserv according to Github Status, there is an issue with 
So I would advise that we just wait for the incident to be resolved. |
Incident is ongoing still, but the job has been completed! |
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Benchmarks
| Benchmark suite | Current: 6f8864b | Previous: 037f5ad | Ratio |
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Dhrystone |
4.44 Average DMIPS over 10 runs |
4.57 Average DMIPS over 10 runs |
1.03 |
Coremark |
0.004 Average iterations/sec over 10 runs |
0.004 Average iterations/sec over 10 runs |
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The sret instruction involves privilege mode change, so the implementation of sret instruction will be tested along in #438 and skip for this PR. |
Refine the subject of both pull request and git commit messages. You are indeed implementing |
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sret instruction is used for returning from a trap when trap occurs in S-mode level. Thus, the execution flow will not be sequential. During basic block translation, the sret instruction should be considered as can_branch instruction. Moreover, the existing system instruction decoder does not support decoding the sret instruction. Thus, the ir->opcode should be set correctly to support decoding the sret instruction. The implementation of sret instruction is simply returning false for now, the improved implementation will be completed and tested in sysprog21#438 since the sret instruction involves privilege mode changing.
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Thank @ChinYikMing for contributing! |
Since sret is made to branchable in sysprog21#443, the relevant checking function which determine if the instruction is branchable also should be updated.
sret instruction is used for returning from a trap when trap occurs in S-mode level. Thus, the execution flow will not be sequential. During basic block translation, the sret instruction should be considered as can_branch instruction.