[Bug target/83321] [8 Regression] Conditional jump or move depends on uninitialised value in ira.c/ira-color.c

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83321

--- Comment #11 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
Hmm, for example this is the assembly diff of update_costs_from_copies()

@@ -8450,7 +8446,6 @@
        movl    12(%rdi), %eax
        sall    $10, %eax
        sarl    $16, %eax
-       testl   %eax, %eax
        js      .L1539
        cmpw    $0, 10(%rdi)
        je      .L1539

So it looks like valgrind doesn't know that SAR also sets the Zero flag.