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From: "vineet.gupta at linux dot dev" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/106265] RISC-V SPEC2017 507.cactu code bloat due to
 address generation
Date: Mon, 11 Jul 2022 23:23:07 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106265

--- Comment #1 from Vineet Gupta <vineet.gupta at linux dot dev> ---
Analyzed a section of -dP dump where reg a2 is setup with exact same value
while being live.

rhs-cred.cc:42: (*(double *)((char *)&ao)[k] + *(double *)((char *)0)[12] +
#(insn 2662 1711 76 (set (reg:DI 12 a2 [2816])
#        (const_int 4096 [0x1000])) "rhs-cred.cc":42:47 139 {*movdi_64bit}
#     (nil))
        li      a2,4096         # tmp2816,      # 2662  [c=3D4 l=3D4]=20
*movdi_64bit/1


rhs-cred.cc:39: bg =3D (&ao[az])[0] * *(&ao)[av] + *(&ao)[2];
#(insn 76 2662 2663 (set (reg/f:DI 20 s4 [orig:193 _239 ] [193])
#        (plus:DI (reg:DI 13 a3 [1865])
#            (reg:DI 20 s4 [orig:181 _224 ] [181]))) "rhs-cred.cc":39:40 4
{adddi3}
#     (expr_list:REG_DEAD (reg:DI 13 a3 [1865])
#        (nil)))
        add     s4,a3,s4        # _224, _239, tmp1865   # 76    [c=3D4 l=3D=
4]=20
adddi3/0


rhs-cred.cc:42: (*(double *)((char *)&ao)[k] + *(double *)((char *)0)[12] +
#(insn 2663 76 2660 (set (reg:DI 13 a3 [2815])
#        (plus:DI (reg:DI 12 a2 [2816])
#            (const_int -2024 [0xfffffffffffff818]))) "rhs-cred.cc":42:47 4
{adddi3}
#     (expr_list:REG_DEAD (reg:DI 12 a2 [2816])
#        (expr_list:REG_EQUAL (const_int 2072 [0x818])
#            (nil))))
        addi    a3,a2,-2024     #, tmp2815, tmp2816     # 2663  [c=3D4 l=3D=
4]=20
adddi3/1

rhs-cred.cc:44: *(&ao)[av * 2] - *(&ao)[k] - (&ao[az])[2] +
#(insn 2660 2663 1710 (set (reg:DI 12 a2 [2814])
#        (const_int 4096 [0x1000])) "rhs-cred.cc":44:29 139 {*movdi_64bit}
#     (nil))
        li      a2,4096         # tmp2814,      # 2660  [c=3D4 l=3D4]=20
*movdi_64bit/1=