diff options
Diffstat (limited to 'gcc/config/i386/i386.c')
| -rw-r--r-- | gcc/config/i386/i386.c | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c index c1a760b..db361d9 100644 --- a/gcc/config/i386/i386.c +++ b/gcc/config/i386/i386.c @@ -9981,6 +9981,69 @@ ix86_expand_fp_movcc (operands) return 1; } +/* Expand conditional increment or decrement using adb/sbb instructions. + The default case using setcc followed by the conditional move can be + done by generic code. */ +int +ix86_expand_int_addcc (operands) + rtx operands[]; +{ + enum rtx_code code = GET_CODE (operands[1]); + rtx compare_op; + rtx val = const0_rtx; + + if (operands[3] != const1_rtx + && operands[3] != constm1_rtx) + return 0; + if (!ix86_expand_carry_flag_compare (code, ix86_compare_op0, + ix86_compare_op1, &compare_op)) + return 0; + if (GET_CODE (compare_op) != LTU) + val = operands[3] == const1_rtx ? constm1_rtx : const1_rtx; + if ((GET_CODE (compare_op) == LTU) == (operands[3] == constm1_rtx)) + { + switch (GET_MODE (operands[0])) + { + case QImode: + emit_insn (gen_subqi3_carry (operands[0], operands[2], val)); + break; + case HImode: + emit_insn (gen_subhi3_carry (operands[0], operands[2], val)); + break; + case SImode: + emit_insn (gen_subsi3_carry (operands[0], operands[2], val)); + break; + case DImode: + emit_insn (gen_subdi3_carry_rex64 (operands[0], operands[2], val)); + break; + default: + abort (); + } + } + else + { + switch (GET_MODE (operands[0])) + { + case QImode: + emit_insn (gen_addqi3_carry (operands[0], operands[2], val)); + break; + case HImode: + emit_insn (gen_addhi3_carry (operands[0], operands[2], val)); + break; + case SImode: + emit_insn (gen_addsi3_carry (operands[0], operands[2], val)); + break; + case DImode: + emit_insn (gen_adddi3_carry_rex64 (operands[0], operands[2], val)); + break; + default: + abort (); + } + } + return 1; /* DONE */ +} + + /* Split operands 0 and 1 into SImode parts. Similar to split_di, but works for floating pointer parameters and nonoffsetable memories. For pushes, it returns just stack offsets; the values will be saved |