diff options
Diffstat (limited to 'gcc/config/mn10300/mn10300.c')
| -rw-r--r-- | gcc/config/mn10300/mn10300.c | 50 |
1 files changed, 49 insertions, 1 deletions
diff --git a/gcc/config/mn10300/mn10300.c b/gcc/config/mn10300/mn10300.c index 3bad60b7475..c580457a2b5 100644 --- a/gcc/config/mn10300/mn10300.c +++ b/gcc/config/mn10300/mn10300.c @@ -1,5 +1,5 @@ /* Subroutines for insn-output.c for Matsushita MN10300 series - Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002 + Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc. Contributed by Jeff Law (law@cygnus.com). @@ -1322,3 +1322,51 @@ mn10300_address_cost (x, unsig) } } + +/* Check whether a constant used to initialize a DImode or DFmode can + use a clr instruction. The code here must be kept in sync with + movdf and movdi. */ + +bool +mn10300_wide_const_load_uses_clr (operands) + rtx operands[2]; +{ + long val[2]; + + if (GET_CODE (operands[0]) != REG + || REGNO_REG_CLASS (REGNO (operands[0])) != DATA_REGS) + return false; + + switch (GET_CODE (operands[1])) + { + case CONST_INT: + { + rtx low, high; + split_double (operands[1], &low, &high); + val[0] = INTVAL (low); + val[1] = INTVAL (high); + } + break; + + case CONST_DOUBLE: + if (GET_MODE (operands[1]) == DFmode) + { + REAL_VALUE_TYPE rv; + + REAL_VALUE_FROM_CONST_DOUBLE (rv, operands[1]); + REAL_VALUE_TO_TARGET_DOUBLE (rv, val); + } + else if (GET_MODE (operands[1]) == VOIDmode + || GET_MODE (operands[1]) == DImode) + { + val[0] = CONST_DOUBLE_LOW (operands[1]); + val[1] = CONST_DOUBLE_HIGH (operands[1]); + } + break; + + default: + return false; + } + + return val[0] == 0 || val[1] == 0; +} |