http://llvm.org/bugs/show_bug.cgi?id=16877
Bug ID: 16877
Summary: Global register variable support
Product: clang
Version: trunk
Hardware: All
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: -New Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
register int num asm("ebx");
void f() {
num = 12345;
}
void g() {
int x;
f();
asm("mov %%ebx, %0" : "=r"(x));
// x is now 12345
}
clang parses this successfully and prints a helpful error message; the bug is
that it doesn't actually support this (GNU extension) functionality.
This feature is useful in low-level software like JIT compilers. I realize this
requires support in LLVM (some way to express this constraint in LLIR for a
start), so I'm not sure exactly where this bug should be filed.
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