re PR target/83008 ([performance] Is it better to avoid extra instructions in data...

re PR target/83008 ([performance] Is it better to avoid extra instructions in data passing between loops?)

	PR target/83008
	* config/i386/x86-tune-costs.h (skylake_cost): Fix cost of
	storing integer register in SImode.  Fix cost of 256 and 512
	byte aligned SSE register store.

	* config/i386/i386.c (ix86_multiplication_cost): Fix
	multiplication cost for TARGET_AVX512DQ.

testsuite/ChangeLog:

	PR target/83008
	* gcc.target/i386/pr83008.c: New test.

From-SVN: r257505