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[Bug tree-optimization/54855] Unnecessary duplication when performing scalar operation on vector element
- From: "glisse at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Fri, 12 Oct 2012 17:33:53 +0000
- Subject: [Bug tree-optimization/54855] Unnecessary duplication when performing scalar operation on vector element
- Auto-submitted: auto-generated
- References: <bug-54855-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54855
--- Comment #4 from Marc Glisse <glisse at gcc dot gnu.org> 2012-10-12 17:33:53 UTC ---
Note that a V4SF version should be doable, since it is 3 insn there as well,
although the pattern is different.
(insn 34 61 36 4 (set (reg:SF 103 [ D.2551 ])
(vec_select:SF (reg/v:V4SF 87 [ v ])
(parallel [
(const_int 0 [0])
]))) d.c:13 1380 {*vec_extractv4sf_0}
(nil))
(insn 36 34 37 4 (set (reg:SF 104 [ D.2551 ])
(minus:SF (reg:SF 103 [ D.2551 ])
(reg:SF 106))) d.c:13 759 {*fop_sf_1_sse}
(expr_list:REG_DEAD (reg:SF 103 [ D.2551 ])
(nil)))
(insn 37 36 38 4 (set (reg/v:V4SF 87 [ v ])
(vec_merge:V4SF (vec_duplicate:V4SF (reg:SF 104 [ D.2551 ]))
(reg/v:V4SF 87 [ v ])
(const_int 1 [0x1]))) d.c:13 1377 {vec_setv4sf_0}
(expr_list:REG_DEAD (reg:SF 104 [ D.2551 ])
(nil)))