http://llvm.org/bugs/show_bug.cgi?id=18032
Bug ID: 18032
Summary: addrspec causes incorrect load/store with optimization
on
Product: libraries
Version: 3.3
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Backend: X86
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
To illustrate:
#include<stdio.h>
struct a { int foo; char *bar; };
struct b { a *foo; };
int main() { printf("%s", ((b
__attribute__((address_space(256)))*)0)->foo->bar); }
Compile with:
clang++ -O3 -c -emit-llvm -o - addrspec.cpp | llc -O1 -o - -
This generates the following instruction:
movq %gs:8, %rsi
Which loads from outside of the 'b' structure (seems to assume that a is
located at %gs:0, which is incorrect).
If -O0 is instead passed to llc, the result is as expected (load 'foo' from b,
load 'bar' from a)
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