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(find_reg) If CLASS_CANNOT_CHANGE_SIZE, avoid its registers if

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reg_changes_size.

From-SVN: r7866
This commit is contained in:
Richard Kenner 1994-08-07 08:52:03 -04:00
parent 0f64b8f696
commit d546b10a8e
1 changed files with 14 additions and 1 deletions
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15
gcc/global.c
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@ -923,6 +923,12 @@ find_reg (allocno, losers, alt_regs_p, accept_call_clobbered, retrying)
IOR_HARD_REG_SET (used1, hard_reg_conflicts[allocno]); IOR_HARD_REG_SET (used1, hard_reg_conflicts[allocno]);
#ifdef CLASS_CANNOT_CHANGE_SIZE
if (reg_changes_size[allocno_reg[allocno]])
IOR_HARD_REG_SET (used1,
reg_class_contents[(int) CLASS_CANNOT_CHANGE_SIZE]);
#endif
/* Try each hard reg to see if it fits. Do this in two passes. /* Try each hard reg to see if it fits. Do this in two passes.
In the first pass, skip registers that are preferred by some other pseudo In the first pass, skip registers that are preferred by some other pseudo
to give it a better chance of getting one of those registers. Only if to give it a better chance of getting one of those registers. Only if
@ -1096,7 +1102,14 @@ find_reg (allocno, losers, alt_regs_p, accept_call_clobbered, retrying)
if (local_reg_n_refs[regno] != 0 if (local_reg_n_refs[regno] != 0
/* Don't use a reg no good for this pseudo. */ /* Don't use a reg no good for this pseudo. */
&& ! TEST_HARD_REG_BIT (used2, regno) && ! TEST_HARD_REG_BIT (used2, regno)
&& HARD_REGNO_MODE_OK (regno, mode)) && HARD_REGNO_MODE_OK (regno, mode)
#ifdef CLASS_CANNOT_CHANGE_SIZE
&& ! (reg_changes_size[allocno_reg[allocno]]
&& (TEST_HARD_REG_BIT
(reg_class_contents[(int) CLASS_CANNOT_CHANGE_SIZE],
regno)))
#endif
)
{ {
/* We explicitly evaluate the divide results into temporary /* We explicitly evaluate the divide results into temporary
variables so as to avoid excess precision problems that occur variables so as to avoid excess precision problems that occur