https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106265
--- Comment #2 from Vineet Gupta <vineet.gupta at linux dot dev> --- I've experimented with riscv_rtx_costs() setting cost of const to 1 as discussed in https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98596. This does reduce the number of li 4096 instances to 10 (from 14), but the fragment pasted above generates the same code. # rhs-cred.cc:42: (*(double *)((char *)&ao)[k] + *(double *)((char *)0)[12] + #(insn 2660 1703 76 (set (reg:DI 28 t3 [2817]) # (const_int 4096 [0x1000])) "rhs-cred.cc":42:47 139 {*movdi_64bit} # (nil)) li t3,4096 # tmp2817, # 2660 [c=1 l=4] *movdi_64bit/1 # rhs-cred.cc:39: bg = (&ao[az])[0] * *(&ao)[av] + *(&ao)[2]; #(insn 76 2660 2661 (set (reg/f:DI 16 a6 [orig:193 _239 ] [193]) # (plus:DI (reg:DI 12 a2 [1860]) # (reg:DI 16 a6 [orig:181 _224 ] [181]))) "rhs-cred.cc":39:40 4 {adddi3} # (expr_list:REG_DEAD (reg:DI 12 a2 [1860]) # (nil))) add a6,a2,a6 # _224, _239, tmp1860 # 76 [c=4 l=4] adddi3/0 # rhs-cred.cc:42: (*(double *)((char *)&ao)[k] + *(double *)((char *)0)[12] + #(insn 2661 76 2658 (set (reg:DI 12 a2 [2816]) # (plus:DI (reg:DI 28 t3 [2817]) # (const_int -2040 [0xfffffffffffff808]))) "rhs-cred.cc":42:47 4 {adddi3} # (expr_list:REG_DEAD (reg:DI 28 t3 [2817]) # (expr_list:REG_EQUAL (const_int 2056 [0x808]) # (nil)))) addi a2,t3,-2040 #, tmp2816, tmp2817 # 2661 [c=4 l=4] adddi3/1 # rhs-cred.cc:44: *(&ao)[av * 2] - *(&ao)[k] - (&ao[az])[2] + #(insn 2658 2661 1702 (set (reg:DI 28 t3 [2815]) # (const_int 4096 [0x1000])) "rhs-cred.cc":44:29 139 {*movdi_64bit} # (nil)) li t3,4096 # tmp2815, # 2658 [c=1 l=4] *movdi_64bit/1
