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ira: update allocated_hardreg_p[] in improve_allocation() [PR110254]

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The improve_allocation() routine does not update the
allocated_hardreg_p[] array after an allocno is assigned a register.

If the register chosen in improve_allocation() is one that already has
been assigned to a conflicting allocno, then allocated_hardreg_p[]
already has the corresponding bit set to TRUE, so nothing needs to be
done.

But improve_allocation() can also choose a register that has not been
assigned to a conflicting allocno, and also has not been assigned to any
other allocno. In this case, allocated_hardreg_p[] has to be updated.

2023-07-21  Surya Kumari Jangala  <jskumari@linux.ibm.com>

gcc/
	PR rtl-optimization/110254
	* ira-color.cc (improve_allocation): Update array
	allocated_hard_reg_p.
This commit is contained in:
Surya Kumari Jangala 2023-08-14 09:34:56 -05:00
parent 2c907d5456
commit 02ecc9a263
1 changed files with 4 additions and 0 deletions
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4
gcc/ira-color.cc
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@ -3340,6 +3340,10 @@ improve_allocation (void)
}
/* Assign the best chosen hard register to A. */
ALLOCNO_HARD_REGNO (a) = best;
for (j = nregs - 1; j >= 0; j--)
allocated_hardreg_p[best + j] = true;
if (internal_flag_ira_verbose > 2 && ira_dump_file != NULL)
fprintf (ira_dump_file, "Assigning %d to a%dr%d\n",
best, ALLOCNO_NUM (a), ALLOCNO_REGNO (a));