On Mon, May 05, 2025 at 06:20:40AM -0700, Andi Kleen wrote:
> > If the branch edge destination is a basic block with only a direct
> > sibcall, change the jcc target to the sibcall target, decrement the
> > destination basic block entry label use count and redirect the edge
> > to the exit basic bl
> If the branch edge destination is a basic block with only a direct
> sibcall, change the jcc target to the sibcall target, decrement the
> destination basic block entry label use count and redirect the edge
> to the exit basic block. Call delete_unreachable_blocks to delete
> the unreachable bas
x86 conditional branch (jcc) target can be either a label or a symbol.
Add a pass to fold tail call with jcc by turning:
jcc .L6
...
.L6:
jmp tailcall
into:
jcc tailcall
Immediately before the pass which turning REG_EH_REGION notes back into
NOTE_INSN_EH_REGI
