https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108754
--- Comment #2 from Hans-Peter Nilsson <hp at gcc dot gnu.org> ---
Diff of .s for mzero3 at -O2:
--- /x/0/gccobj/gcc/testsuite/gcc/mzero3.x2-mzero3.s 2023-02-10
17:57:56.786279467 +0100
+++ /x/1/gccobj/gcc/testsuite/gcc/mzero3.x2-mzero3.s 2023-02-10
17:57:06.083925076 +0100
@@ -94,10 +94,8 @@ _main:
move.d $r8,$r12
move.d $r7,$r13
jsr $r4
- move.d [_zerof],$r9
- move.d $r9,[$sp+36]
move.d _negf,$r2
- move.d $r9,$r10
+ move.d [$sp+36],$r10
Jsr $r2
move.d [_nzerof],$r3
move.d _expectf,$r0
That's the setup to call negf (zerof), and the diff is that zerof is saved to
stack before the patch, but with the patch, the uninitialized contents of that
slot is used.
