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From: "uros at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/17619] Non-optimal code for -mfpmath=387,sse
Date: Wed, 01 Dec 2004 14:07:00 -0000	[thread overview]
Message-ID: <20041201140729.12711.qmail@sourceware.org> (raw)
In-Reply-To: <20040922191917.17619.bangerth@dealii.org>


------- Additional Comments From uros at gcc dot gnu dot org  2004-12-01 14:07 -------
With "GCC: (GNU) 4.0.0 20041201 (experimental)", following code is produced
(without -ffast-math):

_Z6foobarv:
.LFB2:
        pushl   %ebp
.LCFI0:
        movl %esp, %ebp
.LCFI1:
        subl $4, %esp
.LCFI2:
        flds b+12
        fmuls   a+12
        movss   b, %xmm1
        mulss   a, %xmm1
        addss   .LC0, %xmm1
        movss   b+4, %xmm0
        mulss   a+4, %xmm0
        addss   %xmm0, %xmm1
        movss   b+8, %xmm0
        mulss   a+8, %xmm0
        addss   %xmm0, %xmm1
        movss   %xmm1, -4(%ebp)
        flds -4(%ebp)
        faddp   %st, %st(1)
        leave
        ret

Please note, that we should return the result in fp reg, so final flds is needed
in any case. I think, this code is optimal.

Should we close this bug?

Uros.

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17619


  parent reply	other threads:[~2004-12-01 14:07 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2004-09-22 19:19 [Bug target/17619] New: " bangerth at dealii dot org
2004-09-22 19:33 ` [Bug target/17619] " bangerth at dealii dot org
2004-09-22 21:16 ` pinskia at gcc dot gnu dot org
2004-09-22 21:22 ` bangerth at dealii dot org
2004-09-22 21:25 ` bangerth at dealii dot org
2004-09-22 21:35 ` bangerth at dealii dot org
2004-12-01 14:07 ` uros at gcc dot gnu dot org [this message]
2004-12-01 14:27 ` pinskia at gcc dot gnu dot org
2004-12-01 16:03 ` uros at gcc dot gnu dot org
2004-12-01 20:49 ` bangerth at dealii dot org
2004-12-01 20:59 ` bangerth at dealii dot org

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