OPTIMIZATIONS
Function
-Odb [= <option Char> {<option Char>}]
<option Char> is one of the following:
a: Disable mid level label rearranging
b: Disable mid level branch tail merging
c: Disable mid level loop hoisting
None
None
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This option disables branch optimizations on the SSA form based on control flows. Label rearranging sorts all labels of the control flow to generate a minimum amount of branches.
Branch tail merging places common code into joining labels, as shown:
void fun(void) {void fun(void) {
if(cond) {if(cond) {
...
a = 0;} else {
} else {...
...}
a = 0;a = 0;
}}
}
-Odb disables all mid-level branch optimizations
-Odb=b disables only branch tail merging
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