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From: Falk Hueffner <falk.hueffner@student.uni-tuebingen.de>
To: gcc-gnats@gcc.gnu.org
Subject: target/7238: __builtin_alpha_pkwb generates invalid assembly
Date: Mon, 08 Jul 2002 17:06:00 -0000 [thread overview]
Message-ID: <E17RiUE-0000Yv-00@localhost> (raw)
>Number: 7238
>Category: target
>Synopsis: __builtin_alpha_pkwb generates invalid assembly
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Mon Jul 08 17:06:02 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator: Falk Hueffner
>Release: 3.2 20020707 (experimental)
>Organization:
>Environment:
System: Linux borkum 2.4.18 #1 Tue Jul 2 23:35:32 CEST 2002 alpha unknown
Architecture: alpha
host: alphapca56-unknown-linux-gnu
build: alphapca56-unknown-linux-gnu
target: alphapca56-unknown-linux-gnu
configured with: ../configure --enable-languages=c
>Description:
With the input below, gcc generates a pkwb statement that uses a
floating point register, which is not valid. Also, it loses pkwb(23),
so the result would be wrong even if it had chosen an integer
register.
>How-To-Repeat:
% cat bug.c
unsigned long simple_idct_put(unsigned long l)
{
l = __builtin_alpha_pkwb(l) | (__builtin_alpha_pkwb(23) << 32);
return __builtin_alpha_pkwb(l);
}
% gcc -O3 -mcpu=pca56 -c bug.c
/tmp/ccbGMrgd.s: Assembler messages:
/tmp/ccbGMrgd.s:13: Error: inappropriate arguments for opcode `pkwb'
/tmp/ccbGMrgd.s:14: Error: inappropriate arguments for opcode `pkwb'
% gcc -O3 -mcpu=pca56 -S bug.c && cat bug.s
.set noat
.set noreorder
.arch pca56
.text
.align 2
.align 4
.globl simple_idct_put
.ent simple_idct_put
$simple_idct_put..ng:
simple_idct_put:
.frame $30,0,$26,0
.prologue 0
pkwb $16,$f10
pkwb $f10,$0
ret $31,($26),1
.end simple_idct_put
.ident "GCC: (GNU) 3.2 20020707 (experimental)"
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
next reply other threads:[~2002-07-09 0:06 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-07-08 17:06 Falk Hueffner [this message]
2003-01-03 19:37 bangerth
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