https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93221
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
So we have:
(insn 4 3 5 2 (set (reg:OI 92)
(subreg:OI (reg:V4SI 93) 0)) "t.c":9:1 3402 {*aarch64_movoi}
(expr_list:REG_DEAD (reg:V4SI 93)
(nil)))
(insn 5 4 7 2 (set (subreg:V4SI (reg:OI 92) 16)
(reg:V4SI 94)) "t.c":9:1 1200 {*aarch64_simd_movv4si}
(expr_list:REG_DEAD (reg:V4SI 94)
(nil)))
IRA says:
r94: preferred FP_REGS, alternative NO_REGS, allocno FP_REGS
a2 (r94,l0) best FP_REGS, allocno FP_REGS
r93: preferred FP_REGS, alternative NO_REGS, allocno FP_REGS
a3 (r93,l0) best FP_REGS, allocno FP_REGS
r92: preferred FP_REGS, alternative NO_REGS, allocno FP_REGS
a1 (r92,l0) best FP_REGS, allocno FP_REGS
a1(r92,l0) costs: FP_LO8_REGS:0 FP_LO_REGS:0 FP_REGS:0 MEM:6000
a2(r94,l0) costs: TAILCALL_ADDR_REGS:12000 GENERAL_REGS:12000
FP_LO8_REGS:2000 FP_LO_REGS:2000 FP_REGS:2000 POINTER_AND_FP_REGS:14000
MEM:5000
a3(r93,l0) costs: FP_LO8_REGS:2000 FP_LO_REGS:2000 FP_REGS:2000 MEM:5000
