[llvm-bugs] [Bug 38751] Missed optimization in 16-bit __builtin_add_overflow on aarch64

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=38751

Arnaud de Grandmaison <arnaud.degrandmaison at arm.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED
 Fixed By Commit(s)|                            |344439

--- Comment #4 from Arnaud de Grandmaison <arnaud.degrandmaison at arm.com> ---
Closing this bug as commit r344439 fixed this issue :

$ cat pr38751.c
#include <stdint.h>

void g(int a, int b, int *c, int *o, int *v) {
  *o = __builtin_add_overflow((int16_t)a, (int16_t)b, (int16_t *)c);
}

$ bin/clang -target arm64 -c -O3 -o - -S pr38751.c
        ...
g:
        sxth    w8, w0
        add     w8, w8, w1, sxth
        cmp     w8, w8, sxth
        cset    w9, ne
        strh    w8, [x2]
        str     w9, [x3]
        ret
        ...

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