distribute_links tries to place a log_link for whatever the destination
of the modified instruction is. It shouldn't do that when that dest
is pc_rtx, which isn't actually a register.
Committing to trunk.
Segher
2018-03-14 Segher Boessenkool <seg...@kernel.crashing.org>
* combine.c (distribute_links): Don't make a link based on pc_rtx.
---
gcc/combine.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/gcc/combine.c b/gcc/combine.c
index 0a447b9..eaebe65 100644
--- a/gcc/combine.c
+++ b/gcc/combine.c
@@ -14812,6 +14812,9 @@ distribute_links (struct insn_link *links)
|| GET_CODE (reg) == SUBREG)
reg = XEXP (reg, 0);
+ if (reg == pc_rtx)
+ continue;
+
/* A LOG_LINK is defined as being placed on the first insn that uses
a register and points to the insn that sets the register. Start
searching at the next insn after the target of the link and stop
--
1.8.3.1
