I would like a code review for the attached diff. This diff enables more control to X8664 "Scale, Index, Base" (SIB) flag CG_merge_counters_x86 with the BOOL variable CG_merge_counters_x86_set. Using this hook, we proceed to set CG_merge_counters_x86 at O3 thereby enabling default SIB at O3.
This change has been tested with SPEC 2006 and other FP applications. Best regards, Ram Member of Technical Staff, Open Source Compiler Engineering, Advanced Micro Devices
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