diff options
Diffstat (limited to 'gcc/combine.c')
| -rw-r--r-- | gcc/combine.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/gcc/combine.c b/gcc/combine.c index 96f33201372..d9e0b4fcda5 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -1527,7 +1527,7 @@ cant_combine_insn_p (rtx insn) /* Never combine loads and stores involving hard regs that are likely to be spilled. The register allocator can usually handle such reg-reg moves by tying. If we allow the combiner to make - substitutions of likely-spilled regs, we may abort in reload. + substitutions of likely-spilled regs, reload might die. As an exception, we allow combinations involving fixed regs; these are not available to the register allocator so there's no risk involved. */ @@ -2096,8 +2096,7 @@ try_combine (rtx i3, rtx i2, rtx i1, int *new_direct_jump_p) || (i1 != 0 && FIND_REG_INC_NOTE (i1, NULL_RTX) != 0 && (n_occurrences + added_sets_1 + (added_sets_2 && ! i1_feeds_i3) > 1)) - /* Fail if we tried to make a new register (we used to abort, but there's - really no reason to). */ + /* Fail if we tried to make a new register. */ || max_reg_num () != maxreg /* Fail if we couldn't do something and have a CLOBBER. */ || GET_CODE (newpat) == CLOBBER |