-fwrapv-pointer doesn't affect member accesses

[efriedma-quic]

Compile the following with -fwrapv-pointer:

struct S { int x,y; };
int *a(struct S *x) { return &x->y; }

Produces getelementptr inbounds nuw %struct.S, ptr %0, i32 0, i32 1... which seems counter to the premise of -fwrapv-pointer. And seems like it might be a problem with #130742 .

CC @dtcxzyw @nikic

[llvmbot]

@llvm/issue-subscribers-clang-codegen

Author: Eli Friedman (efriedma-quic)

Compile the following with -fwrapv-pointer:

struct S { int x,y; };
int *a(struct S *x) { return &x->y; }

Produces getelementptr inbounds nuw %struct.S, ptr %0, i32 0, i32 1... which seems counter to the premise of -fwrapv-pointer. And seems like it might be a problem with #130742 .

CC @dtcxzyw @nikic