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From: "sugioka at itonet dot co dot jp" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/27182] New: [4.1 regression] SH: wrong-code generation
Date: Mon, 17 Apr 2006 13:17:00 -0000 [thread overview]
Message-ID: <bug-27182-8402@http.gcc.gnu.org/bugzilla/> (raw)
Hi,
gcc-4.1.0 miscompiles on sh4-linux target.
Attached testcase does not trigger this bug on mainline,
and also correctly compiled with gcc-3.4.5.
For attached testcase, source line 514 is incorrectly compiled with
following command line.
g++ -O2 -g -fno-strict-aliasing -fwrapv \
-fno-implicit-templates -fno-exceptions -fno-rtti -S -o bad.s sql_select4.ii
incorrect result:
.loc 1 515 0
mov.l @(52,r14),r2
.loc 1 514 0
add #12,r1
.loc 1 515 0
mov.l r2,@-r1
.loc 1 514 0
mov #0,r2
mov.l r2,@r1 <===== #0 is stored incorrect address
("add #4,r1" is needed bofore this
line)
Adding -fno-schedule-insns fixes this.
g++ -O2 -g -fno-schedule-insns -fno-strict-aliasing -fwrapv \
-fno-implicit-templates -fno-exceptions -fno-rtti -S -o good.s
sql_select4.ii
correct result:
mov #0,r2
.....
fmov.s fr6,@r1
fmov.s fr7,@-r1
.loc 1 514 0
add #12,r1
mov.l r2,@r1
.loc 1 515 0
mov.l @(52,r14),r7
mov.l r7,@-r1
On mainline, this problem disapeares after following patch.
2005-11-30 Paolo Bonzini <bonzini@gnu.org>
* simplify-rtx.c (simplify_plus_minus): Remove final parameter.
Always produce an output if we can remove NEGs or canonicalize
(minus (minus ...)) expressions. Provide a fast path for the
two-operand case.
(simplify_gen_binary): Do not call simplify_plus_minus.
(simplify_binary_operation_1): Reassociate at the end of the
function.
--
Summary: [4.1 regression] SH: wrong-code generation
Product: gcc
Version: 4.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: sugioka at itonet dot co dot jp
GCC build triplet: sh4-unknown-linux
GCC host triplet: sh4-unknown-linux
GCC target triplet: sh4-unknown-linux
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27182
next reply other threads:[~2006-04-17 13:17 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-04-17 13:17 sugioka at itonet dot co dot jp [this message]
2006-04-17 13:19 ` [Bug target/27182] " sugioka at itonet dot co dot jp
2006-04-19 12:42 ` kkojima at gcc dot gnu dot org
2006-04-19 19:35 ` amylaar at gcc dot gnu dot org
2006-04-19 22:41 ` kkojima at gcc dot gnu dot org
2006-04-20 1:54 ` kkojima at gcc dot gnu dot org
2006-04-20 2:04 ` kkojima at gcc dot gnu dot org
2006-06-04 19:47 ` jsm28 at gcc dot gnu dot org
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