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Message-ID: <m31tw06tl7.fsf@carbon.jhcloos.org>
Date: Sun, 11 May 2014 14:46:51 -0400
From: James Cloos <cloos@...loos.com>
To: Rich Felker <dalias@...c.org>
Cc: Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>, musl@...ts.openwall.com
Subject: Re: Broken GCC versions: 4.8.2 and 4.9.0
What does the wrong assembly of your test code look like?
The assembly I get looks reasonable, in that it always references foo:
The O3 version is:
.file "test.c"
.text
.p2align 5,,31
.globl bar
.type bar, @function
bar:
.LFB0:
.cfi_startproc
movl foo(%rip), %edx
xorl %eax, %eax
testl %edx, %edx
setne %al
ret
.cfi_endproc
.LFE0:
.size bar, .-bar
.section .rodata
.align 4
.type dummy, @object
.size dummy, 4
dummy:
.zero 4
.weak foo
.set foo,dummy
.ident "GCC: (Gentoo 4.8.2-r1 p1.4-ssptest, pie-0.5.9-ssptest) 4.8.2"
.section .note.GNU-stack,"",@progbits
Every version tests foo(%rip) and gets the result into %rax.
The ia32, arm32 and arm64 assembly looks right, too.
Perhaps distribution patches affect this?
-JimC
--
James Cloos <cloos@...loos.com> OpenPGP: 0x997A9F17ED7DAEA6
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