When the compgotos pass copies the tail of blocks ending in an indirect
jump, there is a micro-optimization to not copy the last one, since the
original block will then just be deleted. This does not work properly
if cleanup_cfg does not merge all pairs of blocks we expect it to.
2020-08-07 Segher Boessenkool <seg...@kernel.crashing.org>
PR rtl-optimization/96475
* bb-reorder.c (maybe_duplicate_computed_goto): Remove single_pred_p
micro-optimization.
---
gcc/bb-reorder.c | 3 ---
1 file changed, 3 deletions(-)
diff --git a/gcc/bb-reorder.c b/gcc/bb-reorder.c
index c635010..f7a7de8 100644
--- a/gcc/bb-reorder.c
+++ b/gcc/bb-reorder.c
@@ -2680,9 +2680,6 @@ make_pass_reorder_blocks (gcc::context *ctxt)
static bool
maybe_duplicate_computed_goto (basic_block bb, int max_size)
{
- if (single_pred_p (bb))
- return false;
-
/* Make sure that the block is small enough. */
rtx_insn *insn;
FOR_BB_INSNS (bb, insn)
--
1.8.3.1
