Hi,
the following patch makes FP sqrt and div costs to match better modern chips.
It enables vectorization of internal loops in spec2006 cactusAMD and leslie3d
with over 10% speedup on Zen and also on Haswell.
Bootstrapped/regtestex x86_64-linux, comitted.
Honza
PR target/81616
* x86-tune-costs.h (generic_cost): Reduce cost of FDIV 20->17,
cost of sqrt 20->14, DIVSS 18->13, DIVSD 32->17, SQRtSS 30->14
and SQRTsD 58->18, cond_not_taken_branch_cost. 2->1. Increase
cond_taken_branch_cost 3->4.
Index: config/i386/x86-tune-costs.h
===================================================================
--- config/i386/x86-tune-costs.h (revision 256065)
+++ config/i386/x86-tune-costs.h (working copy)
@@ -2293,10 +2293,10 @@ struct processor_costs generic_cost = {
3, /* Branch cost */
COSTS_N_INSNS (3), /* cost of FADD and FSUB insns. */
COSTS_N_INSNS (5), /* cost of FMUL instruction. */
- COSTS_N_INSNS (20), /* cost of FDIV instruction. */
+ COSTS_N_INSNS (17), /* cost of FDIV instruction. */
COSTS_N_INSNS (1), /* cost of FABS instruction. */
COSTS_N_INSNS (1), /* cost of FCHS instruction. */
- COSTS_N_INSNS (20), /* cost of FSQRT instruction. */
+ COSTS_N_INSNS (14), /* cost of FSQRT instruction. */
COSTS_N_INSNS (1), /* cost of cheap SSE instruction. */
COSTS_N_INSNS (3), /* cost of ADDSS/SD SUBSS/SD insns. */
@@ -2304,15 +2304,15 @@ struct processor_costs generic_cost = {
COSTS_N_INSNS (5), /* cost of MULSD instruction. */
COSTS_N_INSNS (5), /* cost of FMA SS instruction. */
COSTS_N_INSNS (5), /* cost of FMA SD instruction. */
- COSTS_N_INSNS (18), /* cost of DIVSS instruction. */
- COSTS_N_INSNS (32), /* cost of DIVSD instruction. */
- COSTS_N_INSNS (30), /* cost of SQRTSS instruction. */
- COSTS_N_INSNS (58), /* cost of SQRTSD instruction. */
+ COSTS_N_INSNS (13), /* cost of DIVSS instruction. */
+ COSTS_N_INSNS (17), /* cost of DIVSD instruction. */
+ COSTS_N_INSNS (14), /* cost of SQRTSS instruction. */
+ COSTS_N_INSNS (18), /* cost of SQRTSD instruction. */
1, 4, 3, 3, /* reassoc int, fp, vec_int, vec_fp. */
generic_memcpy,
generic_memset,
- COSTS_N_INSNS (3), /* cond_taken_branch_cost. */
- COSTS_N_INSNS (1), /* cond_not_taken_branch_cost. */
+ COSTS_N_INSNS (4), /* cond_taken_branch_cost. */
+ COSTS_N_INSNS (2), /* cond_not_taken_branch_cost. */
};
/* core_cost should produce code tuned for Core familly of CPUs. */
