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<base href="http://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - movaps used for unaligned memory -march=slm -m32"
href="http://llvm.org/bugs/show_bug.cgi?id=22756">22756</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>movaps used for unaligned memory -march=slm -m32
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>LLVM Codegen
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>chh@google.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Built and run on Linux host:
clang++ -march=slm -m32 -O2 -S -o /tmp/p0.s /tmp/p0.cpp
$ cat /tmp/p0.cpp
typedef struct my_attr_t {
int flags;
void* stack_base;
int stack_size;
int guard_size;
int sched_policy;
int sched_priority;
} my_attr_t;
extern "C" void foo0();
extern "C" void foo1(my_attr_t*);
extern "C" void foo2(unsigned);
extern "C" void my_test1(my_attr_t const *attr) {
my_attr_t tmp;
foo0();
foo2(sizeof(tmp));
foo1(&tmp);
tmp = *attr; // *attr might not be aligned.
foo1(&tmp);
}
$ cat /tmp/p1.s
.text
.file "/tmp/p0.cpp"
.globl my_test1
.align 16, 0x90
.type my_test1,@function
my_test1: # @my_test1
.cfi_startproc
# BB#0: # %entry
pushl %edi
.Ltmp0:
.cfi_def_cfa_offset 8
pushl %esi
.Ltmp1:
.cfi_def_cfa_offset 12
subl $52, %esp
.Ltmp2:
.cfi_def_cfa_offset 64
.Ltmp3:
.cfi_offset %esi, -12
.Ltmp4:
.cfi_offset %edi, -8
movl 64(%esp), %esi
calll foo0
movl $24, (%esp)
calll foo2
leal 16(%esp), %edi
movl %edi, (%esp)
calll foo1
movsd 16(%esi), %xmm0 # xmm0 = mem[0],zero
movsd %xmm0, 32(%esp)
movups (%esi), %xmm0
movl %edi, (%esp)
movaps %xmm0, 16(%esp) # ERROR, should be movups
calll foo1
addl $52, %esp
popl %esi
popl %edi
retl
.Ltmp5:
.size my_test1, .Ltmp5-my_test1
.cfi_endproc
.ident "clang version 3.7.0 (<a href="http://llvm.org/git/clang.git">http://llvm.org/git/clang.git</a>
3e1cca7ad0cc730b54c1a2057f9ce36a85eab75a) (llvm/trunk 230778)"
.section ".note.GNU-stack","",@progbits
The passed in attr pointer could point to a 4-byte aligned my_attr_t subobject
inside other object.</pre>
</div>
</p>
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