mintrinsic-promote, Qintrinsic-promote
Enables functions containing calls to intrinsics that require a specific CPU feature to have their target architecture automatically promoted to allow the required feature.
momit-leaf-frame-pointer
Determines whether the frame pointer is omitted or kept in leaf functions.
mtune, tune
Performs optimizations for specific processors but does not cause extended instruction sets to be used (unlike -march).
regcall, Qregcall
Tells the compiler that the __regcall calling convention should be used for functions that do not directly specify a calling convention.
x, Qx
Tells the compiler which processor features it may target, including which instruction sets and optimizations it may generate.
xHost, QxHost
Tells the compiler to generate instructions for the highest instruction set available on the compilation host processor.