https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94042
--- Comment #23 from Martin Liška <marxin at gcc dot gnu.org> --- (In reply to Andrew Pinski from comment #20) > The return value of the first _Z11tsubst_exprP9tree_nodeS0_iS0_b.part.0 was > being copied into r8 and then copied back into r3 (return value), but not r0 > is used and that r0 is used for mtlr (moving back the return address). This is the correct explanation, thanks Adrew. In good version │0x104c9128 <._Z19tsubst_template_argP9tree_nodeS0_iS0_+104> bl 0x1049f300 <._Z11tsubst_exprP9tree_nodeS0_iS0_b.part.0> sets return value to $r3, which is then returned ($r8 = $r3, $r3 = $r8): (gdb) p /x $r3 $60 = 0x3fffaf3814d0 while in bad version we return value of: │0x104c9134 <._Z19tsubst_template_argP9tree_nodeS0_iS0_+116> mtlr r0 (gdb) p /x $r3 $31 = 0x104c92a4 which is the return address (can be seen in back-trace).
