Default to turning on architecture specific optimizations in the codegen
LLVM defaults to turning on whatever architecture specific optimizations are supported on the user's machine (e.g. -msse4.2). This makes programs run faster during testing and generally gives users a better perception of the compiler. If the user wants to compile for some more portable subset (e.g. when cross-compiling) he/she adds -march, -mcpu, etc flags on the command line.
To implement this we'd have to detect what CPU type is used etc and initialize our DynFlags based on that.
Trac metadata
| Trac field | Value |
|---|---|
| Version | 7.6.3 |
| Type | Bug |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | Compiler |
| Test case | |
| Differential revisions | |
| BlockedBy | |
| Related | |
| Blocking | |
| CC | |
| Operating system | |
| Architecture |