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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]);
#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.
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
@ -1096,7 +1102,14 @@ find_reg (allocno, losers, alt_regs_p, accept_call_clobbered, retrying)
if (local_reg_n_refs[regno] != 0
/* Don't use a reg no good for this pseudo. */
&& ! 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
variables so as to avoid excess precision problems that occur