[Bug tree-optimization/114289] Non-optimal assembly for accessing bit-fields in packed structs

[dan at stahlke dot org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114289

Dan Stahlke <dan at stahlke dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Target|x86_64-linux-gnu            |
           Keywords|missed-optimization         |
          Component|middle-end                  |tree-optimization

--- Comment #1 from Dan Stahlke <dan at stahlke dot org> ---
Variants that generate more reasonable results:

struct foo {
    int x:32;
} __attribute__((packed));

struct foo {
    int x:16;
} __attribute__((packed));

struct foo {
    int x:31;
};

struct foo {
    int x:31;
} __attribute__((packed, aligned(4)));