http://d.puremagic.com/issues/show_bug.cgi?id=5647
Summary: Valgrind complains about illegal instruction
Product: D
Version: D2
Platform: x86_64
OS/Version: Linux
Status: NEW
Severity: minor
Priority: P2
Component: DMD
AssignedTo: nob...@puremagic.com
ReportedBy: mint...@gmail.com
--- Comment #0 from Espen Overaae <mint...@gmail.com> 2011-02-23 15:38:50 PST
---
I don't know if this is a bug in valgrind or dmd, but here goes:
I compile a small sample program with dmd version 2.052 and the -m64 flag.
Then I run the resulting binary in valgrind-3.6.0.SVN-Debian on ubuntu 10.04
x86_64
Valgrind complains:
==24857== Process terminating with default action of signal 4 (SIGILL)
==24857== Illegal opcode at address 0x417862
$ cat bug.d
ulong rtt;
void updateRTT(ulong time){
float mtime = cast(double)(time);
mtime *= 0.0001;
mtime += cast(double)(rtt);
mtime *= 0.90;
rtt = cast(ulong)(mtime);
}
void main(){
rtt = 200;
updateRTT(1000);
}
$ objdump -d bug | grep '417862' -B8 -A19
000000000041784c <_D3bug9updateRTTFmZv>:
41784c: 55 push %rbp
41784d: 48 8b ec mov %rsp,%rbp
417850: 48 83 ec 20 sub $0x20,%rsp
417854: 48 89 f8 mov %rdi,%rax
417857: e8 30 3d 00 00 callq 41b58c <__U64_LDBL>
41785c: d9 5d f0 fstps -0x10(%rbp)
41785f: d9 45 f0 flds -0x10(%rbp)
417862: 48 dc 0d 17 44 01 00 rex.W fmull 0x14417(%rip) #
42bc80 <_IO_stdin_used+0x10>
417869: d9 5d f0 fstps -0x10(%rbp)
41786c: d9 45 f0 flds -0x10(%rbp)
41786f: 64 48 8b 0c 25 00 00 mov %fs:0x0,%rcx
417876: 00 00
417878: 48 03 0d 51 b7 21 00 add 0x21b751(%rip),%rcx #
632fd0 <_DYNAMIC+0x208>
41787f: 48 8b 01 mov (%rcx),%rax
417882: e8 05 3d 00 00 callq 41b58c <__U64_LDBL>
417887: de c1 faddp %st,%st(1)
417889: d9 5d f0 fstps -0x10(%rbp)
41788c: d9 45 f0 flds -0x10(%rbp)
41788f: 48 dc 0d f2 43 01 00 rex.W fmull 0x143f2(%rip) #
42bc88 <_IO_stdin_used+0x18>
417896: d9 5d f0 fstps -0x10(%rbp)
417899: d9 45 f0 flds -0x10(%rbp)
41789c: dd 5d e8 fstpl -0x18(%rbp)
41789f: 48 8b 45 e8 mov -0x18(%rbp),%rax
4178a3: e8 04 3d 00 00 callq 41b5ac <__DBLULLNG>
4178a8: 48 89 01 mov %rax,(%rcx)
4178ab: c9 leaveq
4178ac: c3 retq
--
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