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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/96298] [11 Regression] wrong code with -O -fno-tree-forwprop
Date: Thu, 23 Jul 2020 11:55:28 +0000 [thread overview]
Message-ID: <bug-96298-4-nv4fKelRAw@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-96298-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96298
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |segher at gcc dot gnu.org
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
-fdisable-rtl-combine fixes it. In the end it elides an xor, but it prints
many matches so not sure what goes on. Likely an issue in some
simplify-rtx thing.
@@ -175,15 +1453,7 @@
(expr_list:REG_EQUAL (plus:DI (reg:DI 85 [ _10 ])
(const_int 9187201950435737471 [0x7f7f7f7f7f7f7f7f]))
(nil)))))
-(insn 14 13 17 2 (parallel [
- (set (reg:DI 108)
- (xor:DI (reg:DI 106)
- (reg:DI 86 [ _12 ])))
- (clobber (reg:CC 17 flags))
- ]) "t.c":8:18 521 {*xordi_1}
- (expr_list:REG_DEAD (reg:DI 106)
- (expr_list:REG_UNUSED (reg:CC 17 flags)
- (nil))))
+(note 14 13 17 2 NOTE_INSN_DELETED)
(insn 17 14 18 2 (parallel [
(set (reg:DI 110)
(minus:DI (reg:DI 105)
@@ -199,22 +1469,22 @@
(insn 18 17 20 2 (parallel [
(set (reg:DI 112)
(xor:DI (reg:DI 110)
- (reg:DI 86 [ _12 ])))
+ (reg:DI 106)))
(clobber (reg:CC 17 flags))
]) "t.c":8:25 521 {*xordi_1}
- (expr_list:REG_DEAD (reg:DI 110)
- (expr_list:REG_DEAD (reg:DI 86 [ _12 ])
- (expr_list:REG_UNUSED (reg:CC 17 flags)
+ (expr_list:REG_UNUSED (reg:CC 17 flags)
+ (expr_list:REG_DEAD (reg:DI 106)
+ (expr_list:REG_DEAD (reg:DI 110)
(nil)))))
(insn 20 18 21 2 (parallel [
(set (reg:DI 114)
- (xor:DI (reg:DI 108)
- (reg:DI 112)))
+ (xor:DI (reg:DI 112)
+ (reg:DI 86 [ _12 ])))
(clobber (reg:CC 17 flags))
]) "t.c":8:23 521 {*xordi_1}
- (expr_list:REG_DEAD (reg:DI 112)
- (expr_list:REG_DEAD (reg:DI 108)
- (expr_list:REG_UNUSED (reg:CC 17 flags)
+ (expr_list:REG_DEAD (reg:DI 86 [ _12 ])
+ (expr_list:REG_UNUSED (reg:CC 17 flags)
+ (expr_list:REG_DEAD (reg:DI 112)
(nil)))))
next prev parent reply other threads:[~2020-07-23 11:55 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-23 10:17 [Bug tree-optimization/96298] New: " zsojka at seznam dot cz
2020-07-23 11:50 ` [Bug tree-optimization/96298] " rguenth at gcc dot gnu.org
2020-07-23 11:55 ` rguenth at gcc dot gnu.org [this message]
2020-07-23 12:10 ` [Bug rtl-optimization/96298] " segher at gcc dot gnu.org
2020-07-23 12:13 ` marxin at gcc dot gnu.org
2020-07-23 12:56 ` segher at gcc dot gnu.org
2020-07-23 14:01 ` marxin at gcc dot gnu.org
2020-07-23 17:14 ` segher at gcc dot gnu.org
2020-07-23 17:49 ` cvs-commit at gcc dot gnu.org
2020-08-18 13:46 ` cvs-commit at gcc dot gnu.org
2020-08-18 13:58 ` roger at nextmovesoftware dot com
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