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From: "gjl at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/39633] [avr] loop bug
Date: Sat, 09 Jul 2011 16:45:00 -0000 [thread overview]
Message-ID: <bug-39633-4-siA5wVw1xo@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-39633-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39633
--- Comment #8 from Georg-Johann Lay <gjl at gcc dot gnu.org> 2011-07-09 16:45:20 UTC ---
Created attachment 24727
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=24727
C file, reduced test case
Compiler with avr-gcc 4.6.1 -Os -S -fno-split-wide-types -dp
to get:
func_1:
push r8 ; 94 *pushqi/1 [length = 1]
push r9 ; 95 *pushqi/1 [length = 1]
push r10 ; 96 *pushqi/1 [length = 1]
push r11 ; 97 *pushqi/1 [length = 1]
push r12 ; 98 *pushqi/1 [length = 1]
push r13 ; 99 *pushqi/1 [length = 1]
push r14 ; 100 *pushqi/1 [length = 1]
push r15 ; 101 *pushqi/1 [length = 1]
clr r8 ; 3 *movqi/1 [length = 1]
.L2:
lds r24,g_52 ; 15 *movqi/4 [length = 2]
subi r24,lo8(-(1)) ; 16 addqi3/2 [length = 1]
sts g_52,r24 ; 17 *movqi/3 [length = 2]
mov r24,r8 ; 19 *movqi/1 [length = 1]
ldi r22,lo8(3) ; 20 *movqi/2 [length = 1]
rcall foo ; 21 call_value_insn/3 [length = 1]
mov r8,r24 ; 23 *movqi/1 [length = 1]
>>>> BUG START
lsl r24 ; 24 ashrqi3/5 [length = 2]
sbc r24,r24
brne .L1 ; 34 branch [length = 1]
>>>> BUG END
tst r24 ; 37 *cmpqi/1 [length = 1]
brne .L1 ; 38 branch [length = 1]
tst r24 ; 41 *cmpqi/1 [length = 1]
brne .L1 ; 42 branch [length = 1]
tst r24 ; 45 *cmpqi/1 [length = 1]
brne .L1 ; 46 branch [length = 1]
tst r24 ; 49 *cmpqi/1 [length = 1]
brne .L1 ; 50 branch [length = 1]
tst r24 ; 53 *cmpqi/1 [length = 1]
brne .L1 ; 54 branch [length = 1]
tst r24 ; 57 *cmpqi/1 [length = 1]
brne .L1 ; 58 branch [length = 1]
ldi r24,lo8(12) ; 93 *movqi/2 [length = 1]
cp r24,r8 ; 61 *cmpqi/2 [length = 1]
brsh .L2 ; 62 branch [length = 1]
.L1:
pop r15 ; 104 popqi [length = 1]
pop r14 ; 105 popqi [length = 1]
pop r13 ; 106 popqi [length = 1]
pop r12 ; 107 popqi [length = 1]
pop r11 ; 108 popqi [length = 1]
pop r10 ; 109 popqi [length = 1]
pop r9 ; 110 popqi [length = 1]
pop r8 ; 111 popqi [length = 1]
ret ; 112 return_from_epilogue [length = 1]
next prev parent reply other threads:[~2011-07-09 16:45 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <bug-39633-4@http.gcc.gnu.org/bugzilla/>
2011-04-14 19:55 ` avr at gjlay dot de
2011-07-09 15:51 ` gjl at gcc dot gnu.org
2011-07-09 16:40 ` gjl at gcc dot gnu.org
2011-07-09 16:45 ` gjl at gcc dot gnu.org [this message]
2011-07-09 17:26 ` gjl at gcc dot gnu.org
2011-07-10 8:31 ` [Bug target/39633] [avr] loop bug: missing 8-bit comparison (*cmpqi) gjl at gcc dot gnu.org
2011-07-10 10:15 ` gjl at gcc dot gnu.org
2011-07-10 21:02 ` gjl at gcc dot gnu.org
2011-07-11 10:14 ` gjl at gcc dot gnu.org
2011-07-11 10:25 ` gjl at gcc dot gnu.org
2011-07-11 10:29 ` gjl at gcc dot gnu.org
2012-05-02 17:15 ` gjl at gcc dot gnu.org
2012-05-02 17:16 ` gjl at gcc dot gnu.org
2009-04-03 23:21 [Bug c/39633] New: loop bug on AVR regehr at cs dot utah dot edu
2009-08-17 9:40 ` [Bug target/39633] [avr] loop bug abnikant dot singh at atmel dot com
2009-08-17 11:56 ` eric dot weddington at atmel dot com
2009-08-17 12:03 ` abnikant dot singh at atmel dot com
2009-08-17 12:08 ` abnikant dot singh at atmel dot com
2009-08-17 12:12 ` eric dot weddington at atmel dot com
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