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On top of the previous patch that implements TARGET_ESTIMATED_POLY_VALUE
and adds an sve_width tuning field to the CPU structs, this patch implements
an -moverride knob to adjust this sve_width field to allow for experimentation.
Again, reminder that this only has an effect when compiling for VLA-SVE that is,
without msve-vector-bits=<foo>. This just adjusts tuning heuristics in the compiler,,
like profitability thresholds for vectorised versioned loops, and others.
It can be used, for example like -moverride=sve_width=256 to set the sve_width
tuning field to 256. Widths outside of the accepted SVE widths [128 - 2048] are rejected
as you'd expect.
* config/aarch64/aarch64.c (aarch64_tuning_override_functions): Add
sve_width entry.
(aarch64_parse_sve_width_string): Define.
* gcc.target/aarch64/sve/override_sve_width_1.c: New test.
From-SVN: r266898
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