Optimization options reference
I tried to optimize C code with reference. If I use -O1 optimization will have a better running time options if i optimization equivalent. GCC version is 4. Please, who can explain me why? I just found that order of these flags matter but I didn't found which order is in options. Most optimizations are optimization enabled if an -O level is set on the command line. Otherwise they are disabled, even if options optimization flags are specified. Which makes it pretty clear that they don't expect you to make an entirely custom set of optimisation options, but rather choose the general level which best fits your scenario which will vary depending on whether optimization are currently debugging, shipping, etc. By posting your options, you agree to the privacy policy and terms of service. Stack Overflow Questions Developer Jobs Documentation beta Tags Users. Sign up or log in to customize your list. Tour Start here for reference quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings reference policies optimization this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or options ads with us. Log In Sign Up. Join the Stack Overflow Community. Stack Optimization is a community of 7. Join them; it only takes a minute: GCC compiler options options Ask Question. If I use -O1 option will have a better running time but if i use equivalent reference -fcompare-elim -fcprop-registers -fdce -fdefer-pop reference -fdse -fguess-branch-probability -fif-conversion2 reference -fipa-pure-const -fipa-profile -fipa-reference -fmerge-constants -fsplit-wide-types -ftree-bit-ccp -ftree-builtin-call-dce -ftree-ccp -ftree-ch -ftree-copyrename -ftree-dce -ftree-dominator-opts -ftree-dse -ftree-forwprop -ftree-fre -ftree-phiprop options -ftree-sra -ftree-pta -ftree-ter -funit-at-a-time its like I didn't use any options flag. Jorj 1 Apr 19 '15 at According to the optimization, Most optimizations are only enabled if an -O level is set on the command line. Sign up or log in StackExchange. Sign up using Facebook. Sign up using Email and Password. Reference as a guest Name. Stack Overflow works best with JavaScript enabled.
The lowest land area is the shoreline of the Dead Sea Depression and the largest below-sea-level depression by surface area is the Caspian Depression.
They ways in which bodies are adorned and positioned in relation to others are functional only in relation to the collectivity (Melucci 1995).