FreeChainXenon/gcc
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

rtl-ssa: Avoid creating duplicated phis

Browse source 
If make_uses_available was called twice for the same use,
we could end up trying to create duplicate definitions for
the same extended live range.

gcc/
	* rtl-ssa/blocks.cc (function_info::create_degenerate_phi): Check
	whether the requested phi already exists.
This commit is contained in:
Richard Sandiford 2023-10-24 11:30:53 +01:00
parent d0eb4aceaa
commit 3e901615ff
1 changed files with 5 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

5
gcc/rtl-ssa/blocks.cc
View file

@ -525,6 +525,11 @@ function_info::create_phi (ebb_info *ebb, resource_info resource,
phi_info *
function_info::create_degenerate_phi (ebb_info *ebb, set_info *def)
{
// Allow the function to be called twice in succession for the same def.
def_lookup dl = find_def (def->resource (), ebb->phi_insn ());
if (set_info *set = dl.matching_set ())
return as_a<phi_info *> (set);
access_info *input = def;
phi_info *phi = create_phi (ebb, def->resource (), &input, 1);
if (def->is_reg ())