commit e786c7547eda4edd90797f6cae0f5e6405d64773 (HEAD -> master)
Author: Vladimir N. Makarov <vmakarov@redhat.com>
Date: Fri Mar 5 11:41:25 2021 -0500
[PR99378] LRA: Skip decomposing address for asm insn operand with unknown constraint.
Function get_constraint_type returns CT__UNKNOWN for empty constraint
and CT_FIXED_FORM for "X". So process_address_1 skipped
decompose_mem_address only for "X" constraint. To do the same for empty
constraint, skip decompose_mem_address for CT__UNKNOWN.
gcc/ChangeLog:
PR target/99378
* lra-constraints.c (process_address_1): Skip decomposing address
for asm insn operand with unknown constraint.
gcc/testsuite/ChangeLog:
PR target/99378
* gcc.target/i386/pr99123-2.c: New.
@@ -3450,8 +3450,9 @@ process_address_1 (int nop, bool check_only_p,
i.e. bcst_mem_operand in i386 backend. */
else if (MEM_P (mem)
&& !(INSN_CODE (curr_insn) < 0
- && get_constraint_type (cn) == CT_FIXED_FORM
- && constraint_satisfied_p (op, cn)))
+ && (cn == CONSTRAINT__UNKNOWN
+ || (get_constraint_type (cn) == CT_FIXED_FORM
+ && constraint_satisfied_p (op, cn)))))
decompose_mem_address (&ad, mem);
else if (GET_CODE (op) == SUBREG
&& MEM_P (SUBREG_REG (op)))
new file mode 100644
@@ -0,0 +1,51 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -funroll-loops" } */
+
+static inline void *
+baz (void *s, unsigned long c, unsigned int count)
+{
+ int d0, d1;
+ __asm__ __volatile__ (""
+ : "=&c" (d0), "=&D" (d1)
+ :"a" (c), "q" (count), "0" (count / 4), "" ((long) s) /// "1"
+ :"memory");
+ return s;
+}
+
+struct A
+{
+ unsigned long *a;
+};
+
+inline static void *
+bar (struct A *x, int y)
+{
+ char *ptr;
+
+ ptr = (void *) x->a[y >> 12];
+ ptr += y % (1UL << 12);
+ return (void *) ptr;
+}
+
+int
+foo (struct A *x, unsigned int *y, int z, int u)
+{
+ int a, b, c, d, e;
+
+ z += *y;
+ c = z + u;
+ a = (z >> 12) + 1;
+ do
+ {
+ b = (a << 12);
+ d = b - z;
+ e = c - z;
+ if (e < d)
+ d = e;
+ baz (bar (x, z), 0, d);
+ z = b;
+ a++;
+ }
+ while (z < c);
+ return 0;
+}