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[Bug target/82692] [8 Regression] Ordered comparisons used for unordered built-ins
- From: "ubizjak at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Tue, 24 Oct 2017 06:24:53 +0000
- Subject: [Bug target/82692] [8 Regression] Ordered comparisons used for unordered built-ins
- Auto-submitted: auto-generated
- References: <bug-82692-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82692
Uroš Bizjak <ubizjak at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2017-10-24
Ever confirmed|0 |1
--- Comment #1 from Uroš Bizjak <ubizjak at gmail dot com> ---
Happens in combine:
(insn 7 6 8 2 (set (reg:CCFPU 17 flags)
(compare:CCFPU (reg:DF 95)
(reg/v:DF 91 [ x ]))) "pr82692.c":9 52 {*cmpiudf}
(expr_list:REG_DEAD (reg:DF 95)
(expr_list:REG_EQUAL (compare:CCFPU (const_double:DF 0.0 [0x0.0p+0])
(reg/v:DF 91 [ x ]))
(nil))))
(insn 8 7 9 2 (set (reg:QI 94)
(unlt:QI (reg:CCFPU 17 flags)
(const_int 0 [0]))) "pr82692.c":9 664 {*setcc_qi}
(expr_list:REG_DEAD (reg:CCFPU 17 flags)
(nil)))
(insn 9 8 10 2 (set (reg:CCZ 17 flags)
(compare:CCZ (reg:QI 94)
(const_int 0 [0]))) "pr82692.c":9 1 {*cmpqi_ccno_1}
(expr_list:REG_DEAD (reg:QI 94)
(nil)))
combines to:
Trying 8 -> 9:
Failed to match this instruction:
(set (reg:CCFPU 17 flags)
(reg:CCFPU 17 flags))
Successfully matched this instruction:
(set (pc)
(if_then_else (ge (reg:CCFPU 17 flags)
(const_int 0 [0]))
(label_ref:DI 34)
(pc)))
Trying 7 -> 9:
Successfully matched this instruction:
(set (reg:CCFP 17 flags)
(compare:CCFP (reg:DF 95)
(reg/v:DF 91 [ x ])))
Successfully matched this instruction:
(set (pc)
(if_then_else (ge (reg:CCFP 17 flags)
(const_int 0 [0]))
(label_ref:DI 34)
(pc)))