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From: Laurent ML <lolo115ml@gmail.com>
To: gdb@gnu.org
Subject: gdb prints only 128 bits of a YMM register (AVX)
Date: Mon, 27 Jul 2015 12:47:00 -0000	[thread overview]
Message-ID: <CA+H-mRiyynNKCyy36ABTRVb1mMa2_Q-sFcbUnzP6q6jxBJXZcQ@mail.gmail.com> (raw)

Hello,

I have created a small C program that uses AVX extensions, and I have
compiled it with options -03 -mavx.
Next I used GDB to print the content of YMM registers, but each time I
print the content of one of the YMM register, gdb prints only the
highest 128 bits of the registers:

Breakpoint 1, 0x0000000000400a70 in func2_compare_32bitsPack ()
$1 = ">"
$2 = {0xffffffffffff00000000000000000000, 0x00000000000000000000000000000000}
$3 = {0x0000000000006e6f73697261706d6f43, 0x00000000000000000000000000000000}
$4 = {0x00000000000000000000000000000000, 0x00000000000000000000000000000000}
$5 = {0x000000000000ff000000000000ffffff, 0x00000000000000000000000000000000}
$6 = {0x00000000000000000000000000000000, 0x00000000000000000000000000000000}
$7 = {0x00000000000000000000000000000000, 0x00000000000000000000000000000000}
$8 = {0x00000000000000000000000000000000, 0x00000000000000000000000000000000}
$9 = {0x00000000000000000000000000000000, 0x00000000000000000000000000000000}
$10 = {0x00000000000000000000000000000000, 0x00000000000000000000000000000000}
$11 = {0x00000000000000000000000000000000, 0x00000000000000000000000000000000}
$12 = {0x00000000000000000000000000000000, 0x00000000000000000000000000000000}
$13 = {0x00000000000000000000000000000000, 0x00000000000000000000000000000000}
$14 = {0x00000000000000000000000000000000, 0x00000000000000000000000000000000}
$15 = {0x00000000000000000000000000000000, 0x00000000000000000000000000000000}
$16 = {0x00000000000000000000000000000000, 0x00000000000000000000000000000000}
$17 = {0x00000000000000000000000000000000, 0x00000000000000000000000000000000}

Is there a way to get the last part of the register ?

I used gdb on EL7 :
$ gdb -v
GNU gdb (GDB) Red Hat Enterprise Linux 7.6.1-64.el7

Thanks for your help.

             reply	other threads:[~2015-07-27 12:47 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-07-27 12:47 Laurent ML [this message]
2015-07-29 11:48 ` Tedeschi, Walfred
2015-07-31  8:53   ` Laurent ML

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