Intel i960 - Optimizations and O Level Settings

i960 Processor Compiler User's Guide
11-2
11
Table 11-1 Optimizations and O level Settings
Optimization
ic960
gcc960
Register management
any level
any level
Branch prediction
0
0
Code compression
0
0
Constant-expression evaluation
0
0
Identity collapsing
0
0
Branch optimization
1
1
Char/short cleaning reduction
1
1
Dead-code elimination
1
1
Leaf-function identification
2
2
Local CSE elimination
1
1
Local-variable promotion
1
1
Loop-invariant code motion
1
1
Specialized-instruction selection
1
1
Tail-call elimination
2
2
Conditional transformation
2
2
Global alias analysis
2
5
Induction variable elimination
2
2
Instruction scheduling
2
2
Constant propagation
2
3
Loop unrolling
2
3
Memory access coalescing
2
3
Variable shadowing
2
3
Allocation of variables to fast memory
3
5
Inter-module, inline function expansion
3
5
Profile-based branch prediction bits setting
3
5
Basic block rearrangement
3
5
Superblock optimizations
3
5