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combine: Don't make log_links for pc_rtx (PR84780 #c10)

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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.


	* combine.c (distribute_links): Don't make a link based on pc_rtx.

From-SVN: r258523
This commit is contained in:
Segher Boessenkool 2018-03-14 13:24:21 +01:00 • committed by Segher Boessenkool
parent af1430196a
commit def703386a
2 changed files with 8 additions and 0 deletions
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gcc/ChangeLog
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@ -1,3 +1,8 @@
2018-03-14 Segher Boessenkool <segher@kernel.crashing.org>
PR rtl-optimization/84780
* combine.c (distribute_links): Don't make a link based on pc_rtx.
2018-03-14 Martin Liska <mliska@suse.cz>
* tree.c (record_node_allocation_statistics): Use

3
gcc/combine.c
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@ -14778,6 +14778,9 @@ 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