@@ -1015,6 +1015,13 @@ copyprop_hardreg_forward_1 (basic_block
EXECUTE_IF_SET_IN_HARD_REG_SET (regs_invalidated_by_call, 0, regno, hrsi)
if (regno < set_regno || regno >= set_regno + set_nregs)
kill_value_regno (regno, 1, vd);
+
+ /* If SET was seen in CALL_INSN_FUNCTION_USAGE, and SET_SRC
+ of the SET isn't in regs_invalidated_by_call hard reg set,
+ but instead among CLOBBERs on the CALL_INSN, we could wrongly
+ assume the value in it is still live. */
+ if (ksvd.ignore_set_reg)
+ note_stores (PATTERN (insn), kill_clobbered_value, vd);
}
/* Notice stores. */
@@ -0,0 +1,54 @@
+/* PR rtl-optimization/57003 */
+/* { dg-do run } */
+/* { dg-options "-O2" } */
+
+#define N 2001
+unsigned short *b, *c, *d;
+
+__attribute__ ((noinline, noclone)) unsigned
+bar (void)
+{
+ asm volatile ("" : : : "memory");
+ return N;
+}
+
+__attribute__ ((noinline, noclone)) unsigned short *
+baz (unsigned long x)
+{
+ if (x != N * sizeof (unsigned short) + 20)
+ __builtin_abort ();
+ asm volatile ("" : : : "memory");
+ return d;
+}
+
+__attribute__ ((ms_abi, noinline, noclone))
+foo (void)
+{
+ unsigned d;
+ unsigned short *e;
+ if ((d = bar ()))
+ {
+ e = baz (d * sizeof (unsigned short) + 20);
+ __builtin_memcpy (e, b, d * sizeof (unsigned short));
+ c = e;
+ }
+}
+
+int
+main ()
+{
+ unsigned short a[2 * N];
+ int i;
+ for (i = 0; i < 2 * N; i++)
+ a[i] = i + 1;
+ b = a;
+ d = a + N;
+ asm volatile ("" : : : "memory");
+ foo ();
+ for (i = 0; i < N; i++)
+ if (a[i] != i + 1 || a[i + N] != i + 1)
+ __builtin_abort ();
+ if (c != a + N)
+ __builtin_abort ();
+ return 0;
+}