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[PR104961] LRA: split hard reg for reload pseudo with clobber.

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Splitting hard register live range did not work for subreg of a
multi-reg reload pseudo.  Reload insns for such pseudo contain clobber
of the pseudo and splitting did not take this into account.  The patch
fixes it.

gcc/ChangeLog:

	PR rtl-optimization/104961
	* lra-assigns.cc (find_reload_regno_insns): Process reload pseudo clobber.

gcc/testsuite/ChangeLog:

	PR rtl-optimization/104961
	* gcc.target/i386/pr104961.c: New.
This commit is contained in:
Vladimir N. Makarov 2022-03-18 14:23:40 -04:00
parent eabf8cad2b
commit 0c016888ff
2 changed files with 34 additions and 14 deletions
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31
gcc/lra-assigns.cc
View File

@ -1706,7 +1706,8 @@ find_reload_regno_insns (int regno, rtx_insn * &start, rtx_insn * &finish)
{
unsigned int uid;
bitmap_iterator bi;
int n = 0;
int insns_num = 0;
bool clobber_p = false;
rtx_insn *prev_insn, *next_insn;
rtx_insn *start_insn = NULL, *first_insn = NULL, *second_insn = NULL;
@ -1714,28 +1715,32 @@ find_reload_regno_insns (int regno, rtx_insn * &start, rtx_insn * &finish)
{
if (start_insn == NULL)
start_insn = lra_insn_recog_data[uid]->insn;
n++;
if (GET_CODE (PATTERN (lra_insn_recog_data[uid]->insn)) == CLOBBER)
clobber_p = true;
else
insns_num++;
}
/* For reload pseudo we should have at most 3 insns referring for
/* For reload pseudo we should have at most 3 insns besides clobber referring for
it: input/output reload insns and the original insn. */
if (n > 3)
if (insns_num > 3)
return false;
if (n > 1)
if (clobber_p)
insns_num++;
if (insns_num > 1)
{
for (prev_insn = PREV_INSN (start_insn),
next_insn = NEXT_INSN (start_insn);
n != 1 && (prev_insn != NULL || next_insn != NULL); )
insns_num != 1 && (prev_insn != NULL || next_insn != NULL); )
{
if (prev_insn != NULL && first_insn == NULL)
if (prev_insn != NULL)
{
if (! bitmap_bit_p (&lra_reg_info[regno].insn_bitmap,
if (bitmap_bit_p (&lra_reg_info[regno].insn_bitmap,
INSN_UID (prev_insn)))
prev_insn = PREV_INSN (prev_insn);
else
{
first_insn = prev_insn;
n--;
insns_num--;
}
prev_insn = PREV_INSN (prev_insn);
}
if (next_insn != NULL && second_insn == NULL)
{
@ -1745,11 +1750,11 @@ find_reload_regno_insns (int regno, rtx_insn * &start, rtx_insn * &finish)
else
{
second_insn = next_insn;
n--;
insns_num--;
}
}
}
if (n > 1)
if (insns_num > 1)
return false;
}
start = first_insn != NULL ? first_insn : start_insn;

15
gcc/testsuite/gcc.target/i386/pr104961.c Normal file
View File

@ -0,0 +1,15 @@
/* { dg-do compile { target int128 } } */
/* { dg-options "-Og" } */
__int128 i;
void bar (int);
void
foo (int a, char b, _Complex unsigned char c)
{
__int128 j = i * i;
c -= 1;
bar (j);
bar (__imag__ c);
}