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[Bug libstdc++/35816] libstdc++ build during bootstrap is optimizing away atomic builtin check
- From: "bkoz at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 14 Apr 2008 22:48:44 -0000
- Subject: [Bug libstdc++/35816] libstdc++ build during bootstrap is optimizing away atomic builtin check
- References: <bug-35816-15855@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #3 from bkoz at gcc dot gnu dot org 2008-04-14 22:48 -------
Wow. Confirmed. This does not happen at -O2 with gcc-4.1.2
However, on gcc-4.3.0 branch:
$bld/H-x86-gcc-4_3-branch.20080227/bin/g++ -O2 -S -march=i386 testatomic.cc
gives:
.file "testatomic.cc"
.text
.p2align 2,,3
.globl main
.type main, @function
main:
.LFB2:
leal 4(%esp), %ecx
.LCFI0:
andl $-16, %esp
pushl -4(%ecx)
.LCFI1:
pushl %ebp
.LCFI2:
movl %esp, %ebp
.LCFI3:
pushl %ecx
.LCFI4:
subl $16, %esp
.LCFI5:
leal -8(%ebp), %edx
xorl %eax, %eax
lock addl %eax, (%edx)
addl $16, %esp
popl %ecx
leave
leal -4(%ecx), %esp
ret
.LFE2:
.size main, .-main
.ident "GCC: (GNU) 4.3.0 20080227 (prerelease)"
.section .note.GNU-stack,"",@progbits
Fix in progress.
--
bkoz at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|unassigned at gcc dot gnu |bkoz at gcc dot gnu dot org
|dot org |
Status|UNCONFIRMED |ASSIGNED
Ever Confirmed|0 |1
Last reconfirmed|0000-00-00 00:00:00 |2008-04-14 22:48:43
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35816