Hi,
The command options can stop the open64 from deleting the unused code, but
they are eliminated in the whirl2c fhase.
I compared the different the differnt command options,and got the assembly
code as follow, the red line means: "i = 6; k = 9;" the test case :
1)just opencc hello.c -o a.out
08048394 <main>:
8048394: 83 c4 fc add $0xfffffffc,%esp
8048397: d9 3c 24 fnstcw (%esp)
804839a: 66 81 24 24 ff fc andw $0xfcff,(%esp)
80483a0: 66 81 0c 24 00 03 orw $0x300,(%esp)
80483a6: d9 2c 24 fldcw (%esp)
80483a9: 83 c4 04 add $0x4,%esp
80483ac: 55 push %ebp
80483ad: 53 push %ebx
80483ae: 31 c0 xor %eax,%eax
80483b0: 5b pop %ebx
80483b1: 5d pop %ebp
80483b2: c3 ret
80483b3: 90 nop
2) opencc -Wunused -IPA:cprop=off -IPA:dce=off -WOPT:ivar_pre=off
-WOPT:icopy=off:copy=off -Wb,-tt32:0x00000400 -O0 --vv hello.c
08048434 <main>:
8048434: 83 c4 fc add $0xfffffffc,%esp
8048437: d9 3c 24 fnstcw (%esp)
804843a: 66 81 24 24 ff fc andw $0xfcff,(%esp)
8048440: 66 81 0c 24 00 03 orw $0x300,(%esp)
8048446: d9 2c 24 fldcw (%esp)
8048449: 83 c4 04 add $0x4,%esp
804844c: 55 push %ebp
804844d: 89 e5 mov %esp,%ebp
804844f: 83 c4 f0 add $0xfffffff0,%esp
8048452: ba 09 00 00 00 mov $0x9,%edx
8048457: 89 55 f8 mov %edx,0xfffffff8(%ebp)
804845a: b9 06 00 00 00 mov $0x6,%ecx
804845f: 89 4d f4 mov %ecx,0xfffffff4(%ebp)
So I have to check if I can do something in the whirl2c phase ?!
Thanks!
Eric
----- Original Message -----
From: eirc.lew
To: Chandrasekhar Murthy ; Shin-Ming Liu
Cc: open64-devel@lists.sourceforge.net
Sent: Thursday, June 09, 2011 10:52 AM
Subject: Re: [Open64-devel] How can I stop open64 delete unused code
Hi,
compiling command is:
opencc -Wunused -IPA:cprop=off -IPA:dce=off -WOPT:ivar_pre=off
-WOPT:icopy=off:copy=off -Wb,-tt32:0x00000400 -O0 --vv hello.c
The input is:
#include<stdio.h>
#define N 100
int main()
{
int i, j, k;
i = 0;
k = 0;
int a[N];
for( j = 0; j < N; j++)
a[j] = j + 4;
return 0;
}
The output is:(there were no i and k)
#include "hello.w2c.h"
extern _INT32 main()
{
_INT32 j;
_INT32 a[100LL];
j = 0;
while(j <= 99)
{
_514 :;
(a)[j] = j + 4;
j = j + 1;
_258 :;
}
goto _770;
_770 :;
return 0;
} /* main */
----- Original Message -----
From: Chandrasekhar Murthy
To: Shin-Ming Liu ; eirc.lew
Cc: open64-devel@lists.sourceforge.net
Sent: Thursday, June 09, 2011 4:34 AM
Subject: RE: [Open64-devel] How can I stop open64 delete unused code
In the MIPSpro compilers they would be removed in the frontend.
You might want to check where it gets removed starting from the frontend.
Murthy
From: Shin-Ming Liu [mailto:shinm...@gmail.com]
Sent: Wednesday, June 08, 2011 8:46 AM
To: eirc.lew
Cc: open64-devel@lists.sourceforge.net
Subject: Re: [Open64-devel] How can I stop open64 delete unused code
Do you mean the compiler does not reserve space on the stack? The place to
look at is the data layout component in CG. Should be simple to keep them with
simple change.
Shin
On Wed, Jun 8, 2011 at 6:11 AM, eirc.lew <eirc....@gmail.com> wrote:
Hi, all
a example(main.c) as follow:
int main()
{
int sum;
int i, j, k;
for( i = 0; i < 100; i++ )
sum = i + 9;
return 0;
}
when I compile it: opencc -CLIST:: main.c
In the file main.w2c.c, there are no j and k, but I need them.Does someone
know how to do?
Thanks!
Eric
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