commit 4e2291789a8b31c550271405782356e8aeddcee3
Author: Vladimir N. Makarov <vmakarov@redhat.com>
Date: Fri Mar 18 14:23:40 2022 -0400
[PR104961] LRA: split hard reg for reload pseudo with clobber.
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.
@@ -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,
- INSN_UID (prev_insn)))
- prev_insn = PREV_INSN (prev_insn);
- else
+ if (bitmap_bit_p (&lra_reg_info[regno].insn_bitmap,
+ INSN_UID (prev_insn)))
{
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;
new file mode 100644
@@ -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);
+}