diff options
| -rw-r--r-- | gcc/config/sh/sh.c | 18 |
1 files changed, 13 insertions, 5 deletions
diff --git a/gcc/config/sh/sh.c b/gcc/config/sh/sh.c index 0754336..3f35b2f 100644 --- a/gcc/config/sh/sh.c +++ b/gcc/config/sh/sh.c @@ -1400,16 +1400,24 @@ andcosts (RTX) rtx RTX; { int i; + /* Anding with a register is a single cycle and instruction. */ if (GET_CODE (XEXP (RTX, 1)) != CONST_INT) - return 2; + return 1; i = INTVAL (XEXP (RTX, 1)); - /* And can use the extend insns cheaply. */ + /* These constants are single cycle extu.[bw] instructions. */ if (i == 0xff || i == 0xffff) + return 1; + /* Constants that can be used in an and immediate instruction is a single + cycle, but this requires r0, so make it a little more expensive. */ + if (CONST_OK_FOR_L (i)) return 2; - /* Any small constant is reasonably cheap - but requires r0. */ + /* Constants that can be loaded with a mov immediate and an and. + This case is probably unnecessary. */ if (CONST_OK_FOR_I (i)) - return 3; - return 5; + return 2; + /* Any other constants requires a 2 cycle pc-relative load plus an and. + This case is probably unnecessary. */ + return 3; } /* Return the cost of a multiply. */ |