From: "Deng Shi" <Deng.Shi@synopsys.com>
To: <gcc-help@gcc.gnu.org>
Subject: Inconsistent floating point result when using G++ 3.3.6 with option -O0 or -O1 separately
Date: Fri, 14 Jul 2006 05:13:00 -0000 [thread overview]
Message-ID: <63E93BF3055BAC45A75523C731737ECBDFA187@JP01WEMBX1.internal.synopsys.com> (raw)
-----Original Message-----
From: Deng Shi
Sent: 2006年7月13日 10:37
To: 'gnu-help@gnu.org'
Subject: Inconsistent floating point result when using G++ 3.3.6 with option -O0 or -O1 separately
hi expert,
I found our application tool gave the inconsistent floating point result when using different optimization level -O0 or -O1.
Even if I used -O1 plus all the disabling options which includes in -O1, like -O1 -fno-merge-all-constants -fno-zero-initialized-in-bss -fno-function-cse -fno-keep-static-consts -fno-omit-frame-pointer -fno-merge-constants -fno-loop-optimize -fno-cprop-registers -fno-if-conversion -fno-if-conversion2 -fno-delayed-branch -fno-guess-branch-probability -fno-defer-pop -fno-crossjumping -fno-thread-jumps " which command line setting should be equal to -O0, but I still didn't get the consistent result.
I wonder whether there is any additional optimization enabled by -O1 for C++ language which is not documented in GCC manual?
Is there anybody helping me?
Best regards!
Deg
next reply other threads:[~2006-07-14 5:13 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-07-14 5:13 Deng Shi [this message]
2006-07-14 5:52 ` Ian Lance Taylor
2006-07-14 12:28 ` Tim Prince
2006-07-14 6:17 Deng Shi
2006-07-14 6:21 ` Ian Lance Taylor
2006-07-17 0:45 Deng Shi
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