https://llvm.org/bugs/show_bug.cgi?id=31724
Bug ID: 31724
Summary: Clang's call lowering often coerces pointers to ints,
which blocks alias analysis
Product: clang
Version: unspecified
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: LLVM Codegen
Assignee: unassignedclangb...@nondot.org
Reporter: r...@google.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Consider this C code:
struct Handle { void *p; };
extern void g(struct Handle);
void f(struct Handle o) { g(o); }
Here are three examples of clang coercing the 'p' field to an int:
$ clang -S -x c --target=ppc64-linux t.cpp -o - -emit-llvm | grep define
define void @f(i64 %o.coerce) #0 {
$ clang -S -x c --target=x86_64-windows t.cpp -o - -emit-llvm | grep define
define void @f(i64 %o.coerce) #0 {
$ clang -S -x c --target=mips-linux t.cpp -o - -emit-llvm | grep define
define void @f(i32 inreg %o.coerce) #0 {
According to dannyb, this is bad, because the ptrtoint calls block alias
analysis.
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