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RM57L843: Equivalent optimizer flag in GCC

Studio Secode
Prodigy 40 points
Part Number: RM57L843

Tool/software:

Hi, I am compiling a sample code for RM57L843 using two compilers: TI ARM Compiler 16.9.4 (CCS) and the GNU Arm Embedded Toolchain.  The code execution time when using TI compiler is less when compared to GCC. I have kept optimization OFF in both the builds and matched all the flags including the use of HW floating point. The only difference is the default --opt_for_speed=1 used by the TI compiler. What could be the equivalent flag to this, to be used in GCC so that both have almost similar execution time?