[llvm-bugs] [Bug 38487] New: Invalid fastcc function signatures when inlining `this` into multiple parameters and there is inalloca parameters
via llvm-bugs
llvm-bugs at lists.llvm.org
Wed Aug 8 10:31:23 PDT 2018
https://bugs.llvm.org/show_bug.cgi?id=38487
Bug ID: 38487
Summary: Invalid fastcc function signatures when inlining
`this` into multiple parameters and there is inalloca
parameters
Product: clang
Version: 6.0
Hardware: PC
OS: Windows XP
Status: NEW
Severity: normal
Priority: P
Component: LLVM Codegen
Assignee: unassignedclangbugs at nondot.org
Reporter: ngg at tresorit.com
CC: llvm-bugs at lists.llvm.org
The following code has an assertion failure:
fatal error: error in backend: any parameter with the inalloca attribute must
be the only memory argument
The bug is happening both with clang 6.0.1 and 7.0.0 RC1.
Compile with: clang++ -target i386-pc-windows-msvc -O3 -c x.cpp
The F::k function gets the following signature:
define internal fastcc void @"\01?k at F@?A@@QAEXUY@@@Z"(i32, i32, i32, <{
%struct.Y }>* inalloca) unnamed_addr #0 align 2
This is not callable because there cannot be any more memory arguments if there
is inalloca, and the 3 ints are too many to be passed in registers.
// x.cpp
// clang++ -target i386-pc-windows-msvc -O3 -c x.cpp
struct Y
{
int i;
Y();
Y(const Y&);
};
void h(Y y);
namespace {
struct F {
int i1, i2, i3;
void k(Y y) {
y.i = i1+i2+i3;
h(y);
}
};
}
void foo()
{
F f;
Y y;
f.k(y);
}
--
You are receiving this mail because:
You are on the CC list for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-bugs/attachments/20180808/dd25a11d/attachment.html>
More information about the llvm-bugs
mailing list