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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Incorrect calling convention at -O0 for x86_64-pc-win32 target"
href="http://llvm.org/bugs/show_bug.cgi?id=15514">15514</a>
</td>
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<tr>
<th>Summary</th>
<td>Incorrect calling convention at -O0 for x86_64-pc-win32 target
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Windows XP
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Backend: X86
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>jlerouge@apple.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>On the following IR:
target datalayout =
"e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
target triple = "x86_64-pc-win32"
define i32 @foo(i32* %p) {
entry:
%0 = load i32* %p, align 4
ret i32 %0
}
define i32 @main(i32 %argc, i8** %argv) {
entry:
%argc.addr = alloca i32, align 4
store i32 %argc, i32* %argc.addr, align 4
%call = call i32 @foo(i32* %argc.addr)
ret i32 %call
}
llc -O0 produces this for foo:
.def foo;
.scl 2;
.type 32;
.endef
.text
.globl foo
.align 16, 0x90
foo: # @foo
# BB#0: # %entry
pushq %rdi
pushq %rax
movq %rdi, (%rsp)
movl (%rdi), %eax
addq $8, %rsp
popq %rdi
re
llc -O1 produces the correct output.
So, it looks like -O0 is using the wrong calling convention (argument should be
in %rcx, not %rdi). Since this only happens at -O0, it could be something in
X86FastISel.</pre>
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