diff options
Diffstat (limited to 'gcc/lra-constraints.cc')
| -rw-r--r-- | gcc/lra-constraints.cc | 19 |
1 files changed, 8 insertions, 11 deletions
diff --git a/gcc/lra-constraints.cc b/gcc/lra-constraints.cc index 274b52cd..c941d2f 100644 --- a/gcc/lra-constraints.cc +++ b/gcc/lra-constraints.cc @@ -2416,14 +2416,15 @@ process_alt_operands (int only_alternative) if (curr_static_id->operand[nop].type == OP_INOUT || curr_static_id->operand[m].type == OP_INOUT) break; - /* Operands don't match. If the operands are - different user defined explicit hard + /* Operands don't match. For asm if the operands + are different user defined explicit hard registers, then we cannot make them match when one is early clobber operand. */ if ((REG_P (*curr_id->operand_loc[nop]) || SUBREG_P (*curr_id->operand_loc[nop])) && (REG_P (*curr_id->operand_loc[m]) - || SUBREG_P (*curr_id->operand_loc[m]))) + || SUBREG_P (*curr_id->operand_loc[m])) + && INSN_CODE (curr_insn) < 0) { rtx nop_reg = *curr_id->operand_loc[nop]; if (SUBREG_P (nop_reg)) @@ -3328,19 +3329,15 @@ process_alt_operands (int only_alternative) first_conflict_j = j; last_conflict_j = j; /* Both the earlyclobber operand and conflicting operand - cannot both be user defined hard registers. */ + cannot both be user defined hard registers for asm. + Let curr_insn_transform diagnose it. */ if (HARD_REGISTER_P (operand_reg[i]) && REG_USERVAR_P (operand_reg[i]) && operand_reg[j] != NULL_RTX && HARD_REGISTER_P (operand_reg[j]) - && REG_USERVAR_P (operand_reg[j])) - { - /* For asm, let curr_insn_transform diagnose it. */ - if (INSN_CODE (curr_insn) < 0) + && REG_USERVAR_P (operand_reg[j]) + && INSN_CODE (curr_insn) < 0) return false; - fatal_insn ("unable to generate reloads for " - "impossible constraints:", curr_insn); - } } if (last_conflict_j < 0) continue; |