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[IRA] Fix PR91052 by skipping multiple_sets insn in combine_and_move_insns

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As PR91052's comments show, commit r272731 exposed one issue in function
combine_and_move_insns.  Function combine_and_move_insns perform the
unexpected movement which alter live interval of some register, leading
incorrect value to be used.  See PR91052 for details.

2020-02-12  Kewen Lin  <linkw@gcc.gnu.org>
    PR target/91052
    * ira.c (combine_and_move_insns): Skip multiple_sets def_insn.
This commit is contained in:
Kewen Lin 2020-02-11 23:22:02 -06:00
parent 91f993b7e3
commit 4d2248bec5
2 changed files with 10 additions and 0 deletions
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gcc/ChangeLog
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@ -1,3 +1,8 @@
2020-02-12 Kewen Lin <linkw@gcc.gnu.org>
PR target/91052
* ira.c (combine_and_move_insns): Skip multiple_sets def_insn.
2020-02-12 Segher Boessenkool <segher@kernel.crashing.org>
* config/rs6000/rs6000.c (rs6000_debug_print_mode): Don't use sizeof

5
gcc/ira.c
View File

@ -3784,6 +3784,11 @@ combine_and_move_insns (void)
if (can_throw_internal (def_insn))
continue;
/* Instructions with multiple sets can only be moved if DF analysis is
performed for all of the registers set. See PR91052. */
if (multiple_sets (def_insn))
continue;
basic_block use_bb = BLOCK_FOR_INSN (use_insn);
basic_block def_bb = BLOCK_FOR_INSN (def_insn);
if (bb_loop_depth (use_bb) > bb_loop_depth (def_bb))