diff options
Diffstat (limited to 'gcc/rtl.h')
| -rw-r--r-- | gcc/rtl.h | 16 |
1 files changed, 14 insertions, 2 deletions
@@ -110,9 +110,11 @@ struct rtx_def ENUM_BITFIELD(machine_mode) mode : 8; /* 1 in an INSN if it can alter flow of control - within this function. */ + within this function. + LINK_COST_ZERO in an INSN_LIST. */ unsigned int jump : 1; - /* 1 in an INSN if it can call another function. */ + /* 1 in an INSN if it can call another function. + LINK_COST_FREE in an INSN_LIST. */ unsigned int call : 1; /* 1 in a REG if value of this expression will never change during the current function, even though it is not manifestly constant. @@ -897,6 +899,16 @@ extern unsigned int subreg_regno PARAMS ((rtx)); with the preceding insn. */ #define SCHED_GROUP_P(INSN) ((INSN)->in_struct) +/* During sched, for the LOG_LINKS of an insn, these cache the adjusted + cost of the dependence link. The cost of executing an instruction + may vary based on how the results are used. LINK_COST_ZERO is 1 when + the cost through the link varies and is unchanged (i.e., the link has + zero additional cost). LINK_COST_FREE is 1 when the cost through the + link is zero (i.e., the link makes the cost free). In other cases, + the adjustment to the cost is recomputed each time it is needed. */ +#define LINK_COST_ZERO(X) ((X)->jump) +#define LINK_COST_FREE(X) ((X)->call) + /* For a SET rtx, SET_DEST is the place that is set and SET_SRC is the value it is set to. */ #define SET_DEST(RTX) XC2EXP(RTX, 0, SET, CLOBBER) |