* i386.c (ix86_size_cost, i386_cost, i486_cost, pentium_cost,
lakemont_cost, pentiumpro_cost, geode_cost, k6_cost,
athlon_cost, k8_cost, amdfam10_cost, btver1_cost, btver2_cost,
pentium4_cost, nocona_cost): Set reassociation width to 1.
(bdver1_cost, bdver2_cost, bdver3_cost, bdver4_cost): Set reassociation
width to 2 for fp operations and 1 otherwise.
(znver1_cost): Set scalar reassoc width to 4 and vector to 3 and 6
for int and fp.
(atom_cost): Set reassociation width to 2.
(slm_cost, generic_cost): Set fp reassociation width to 2 and 1 otherwise.
(intel_cost): Set fp reassociation width to 4 and 1 otherwise.
(core_cost): Set fp reassociation width to 4 and vector to 2.
(ix86_reassociation_width): Rewrite using cost table; special case
plus/minus on Zen; honor X86_TUNE_SSE_SPLIT_REGS
and TARGET_AVX128_OPTIMAL.
* i386.h (processor_costs): Add
reassoc_int, reassoc_fp, reassoc_vec_int, reassoc_vec_fp.
(TARGET_VECTOR_PARALLEL_EXECUTION, TARGET_REASSOC_INT_TO_PARALLEL,
TARGET_REASSOC_FP_TO_PARALLEL): Remove.
* x86-tune.def (X86_TUNE_REASSOC_INT_TO_PARALLEL): Remove.
(X86_TUNE_REASSOC_FP_TO_PARALLEL): Remove.
(X86_TUNE_VECTOR_PARALLEL_EXECUTION): Remove.
From-SVN: r253448
