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(LINK_COST_ZERO, LINK_COST_FREE): New macros.

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From-SVN: r1949
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Tom Wood 1992-08-25 20:21:53 +00:00
parent 84ef5060e2
commit c376c05b38
1 changed files with 10 additions and 0 deletions
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10
gcc/rtl.h
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@ -481,6 +481,16 @@ extern char *note_insn_name[];
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) ((RTX)->fld[0].rtx)