AN3350 datasheet(51/185 Pages) STMICROELECTRONICS

51 / 185 page

AN3350

Command-line options for optimization

Doc ID 018512 Rev 2

51/185

Sets a specific optimization level. The options for num are:

●

– Global register allocation only for temporary values. Equivalent to #pragma

optimization_level 0

●

– Adds dead code elimination, branch and arithmetic optimizations, expression

simplification, and peephole optimization. Equivalent to #pragma

optimization_level 1

●

– Adds common subexpression elimination, copy and expression propagation, stack

frame compression, stack alignment, and fast floating-point to integer conversions.

Equivalent to: #pragma optimization_level 2.

●

– Adds dead store elimination, live range splitting, loop-invariant code motion,

strength reduction, loop transformations, loop unrolling (with -opt speed only), loop

vectorization, lifetime-based register allocation, and instruction scheduling. Equivalent

to optimization_level 3.

●

– Like level 3, but with more comprehensive optimizations from levels 1 and 2.

Equivalent to #pragma optimization_level 4.

For num options 0 through 4 inclusive, the default is 0.

[no]space

Optimizes object code for size. Equivalent to #pragma optimize_for_size on.

[no]speed

Optimizes object code for speed. Equivalent to #pragma optimize_for_size off.

[no]cse | [no]commonsubs

Common subexpression elimination. Equivalent to #pragma opt_common_subs.

[no]deadcode

Removes dead code. Equivalent to #pragma opt_dead_code.

[no]deadstore

Removes dead assignments. Equivalent to #pragma opt_dead_assignments.

[no]lifetimes

Computes variable lifetimes. Equivalent to #pragma opt_lifetimes.

[no]loop[invariants]

Removes loop invariants. Equivalent to #pragma opt_loop_invariants.

[no]prop[agation]

Propagation of constant and copy assignments. Equivalent to #pragma

opt_propagation

[no]strength

Strength reduction. Reducing multiplication by an array index variable to addition. Equivalent

to #pragma opt_strength_reduction.

[no]dead

Same as -opt [no]deadcode and [no]deadstore. Equivalent to #pragma

opt_dead_code on|off

and #pragma opt_dead_assignments.

[no]peep[hole]

AN3350 Datasheet(PDF) 51 Page - STMicroelectronics

AN3350 Datasheet(HTML) 51 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL