Use test instead of cmp for comparison against zero.
For comparisons test r, r
and cmp r, $0
are interchangeable at least on x86.
However using test leads to slightly smaller code. (Saves a byte per comparison).
A good starting point is stmtToInstrs in compiler/nativeGen/X86/CodeGen starting with how CmmCondBranch is compiled to Instructions.
From there it should be not too hard to track down the required changes.
Trac metadata
Trac field | Value |
---|---|
Version | |
Type | Task |
TypeOfFailure | OtherFailure |
Priority | low |
Resolution | Unresolved |
Component | Compiler (NCG) |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | |
Architecture |