https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95756
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Keywords| |missed-optimization
Ever confirmed|0 |1
Last reconfirmed| |2020-06-19
Target| |x86_64-*-* i?86-*-*
Component|target |rtl-optimization
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
RTL expansion issue, we're ending up with
(insn 5 2 6 2 (set (reg:SF 82 [ <retval> ])
(mem/u/c:SF (symbol_ref/u:DI ("*.LC0") [flags 0x2]) [0 S4 A32]))
"t.c":3:12 -1
(expr_list:REG_EQUAL (const_double:SF 0.0 [0x0.0p+0])
(nil)))
(insn 6 5 10 2 (set (reg:SF 83 [ <retval>+4 ])
(mem/u/c:SF (symbol_ref/u:DI ("*.LC0") [flags 0x2]) [0 S4 A32]))
"t.c":3:12 -1
(expr_list:REG_EQUAL (const_double:SF 0.0 [0x0.0p+0])
(nil)))
(insn 10 6 11 2 (set (reg:SF 84)
(reg:SF 82 [ <retval> ])) "t.c":4:1 -1
(nil))
(insn 11 10 12 2 (set (reg:SF 85)
(reg:SF 83 [ <retval>+4 ])) "t.c":4:1 -1
(nil))
(insn 12 11 13 2 (set (mem/c:SF (plus:DI (reg/f:DI 77 virtual-stack-vars)
(const_int -8 [0xfffffffffffffff8])) [0 S4 A32])
(reg:SF 84)) "t.c":4:1 -1
(nil))
(insn 13 12 14 2 (set (mem/c:SF (plus:DI (reg/f:DI 77 virtual-stack-vars)
(const_int -4 [0xfffffffffffffffc])) [0 S4 A32])
(reg:SF 85)) "t.c":4:1 -1
(nil))
(insn 14 13 15 2 (set (reg:DI 20 xmm0)
(mem/c:DI (plus:DI (reg/f:DI 77 virtual-stack-vars)
(const_int -8 [0xfffffffffffffff8])) [0 S8 A32])) "t.c":4:1 -1
(nil))
(insn 15 14 0 2 (use (reg:DI 20 xmm0)) "t.c":4:1 -1
(nil))
