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(sched_analyze_1, sched_analyze_2): If before reloading,

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record dependences that may be introduced by reload substituting
equivalents for pseudo registers.

From-SVN: r3036
This commit is contained in:
Jim Wilson 1992-12-31 14:44:22 -08:00
parent b7d9fc385d
commit e6b89e8bf2
1 changed files with 14 additions and 0 deletions
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14
gcc/sched.c
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@ -1610,6 +1610,14 @@ sched_analyze_1 (x, insn)
add_dependence (insn, reg_last_sets[regno], REG_DEP_OUTPUT);
reg_last_sets[regno] = insn;
/* Pseudos that are REG_EQUIV to something may be replaced
by that during reloading, so we can potentially read
quantities mentioned in those addresses. */
if (! reload_completed)
if (reg_known_value[regno] != regno_reg_rtx[regno])
if (GET_CODE (reg_known_value[regno]) == MEM)
sched_analyze_2 (XEXP (reg_known_value[regno], 0), insn);
/* Don't let it cross a call after scheduling if it doesn't
already cross one. */
if (reg_n_calls_crossed[regno] == 0 && last_function_call)
@ -1762,6 +1770,12 @@ sched_analyze_2 (x, insn)
if (reg_last_sets[regno])
add_dependence (insn, reg_last_sets[regno], 0);
/* Pseudos that are REG_EQUIV to something may be replaced
by that, so we depend on anything mentioned there too. */
if (! reload_completed)
if (reg_known_value[regno] != regno_reg_rtx[regno])
sched_analyze_2 (reg_known_value[regno], insn);
/* If the register does not already cross any calls, then add this
insn to the sched_before_next_call list so that it will still
not cross calls after scheduling. */