gcc/gcc7-pr79388.patch

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2017-02-11 09:56:13 +00:00
2017-02-10 Jakub Jelinek <jakub@redhat.com>
PR rtl-optimization/79388
PR rtl-optimization/79450
* combine.c (distribute_notes): When removing TEM_INSN for which
corresponding dest has last value recorded, invalidate that last
value.
* gcc.c-torture/execute/pr79388.c: New test.
* gcc.c-torture/execute/pr79450.c: New test.
--- gcc/combine.c.jj 2017-01-30 09:31:48.000000000 +0100
+++ gcc/combine.c 2017-02-10 17:05:57.500482518 +0100
@@ -14288,6 +14288,11 @@ distribute_notes (rtx notes, rtx_insn *f
NULL_RTX, NULL_RTX, NULL_RTX);
distribute_links (LOG_LINKS (tem_insn));
+ unsigned int regno = REGNO (XEXP (note, 0));
+ reg_stat_type *rsp = &reg_stat[regno];
+ if (rsp->last_set == tem_insn)
+ record_value_for_reg (XEXP (note, 0), NULL, NULL_RTX);
+
SET_INSN_DELETED (tem_insn);
if (tem_insn == i2)
i2 = NULL;
--- gcc/testsuite/gcc.c-torture/execute/pr79388.c.jj 2017-02-10 17:03:01.993814529 +0100
+++ gcc/testsuite/gcc.c-torture/execute/pr79388.c 2017-02-10 17:02:50.000000000 +0100
@@ -0,0 +1,23 @@
+/* PR rtl-optimization/79388 */
+/* { dg-additional-options "-fno-tree-coalesce-vars" } */
+
+unsigned int a, c;
+
+__attribute__ ((noinline, noclone)) unsigned int
+foo (unsigned int p)
+{
+ p |= 1;
+ p &= 0xfffe;
+ p %= 0xffff;
+ c = p;
+ return a + p;
+}
+
+int
+main (void)
+{
+ int x = foo (6);
+ if (x != 6)
+ __builtin_abort();
+ return 0;
+}
--- gcc/testsuite/gcc.c-torture/execute/pr79450.c.jj 2017-02-10 17:03:45.698233423 +0100
+++ gcc/testsuite/gcc.c-torture/execute/pr79450.c 2017-02-10 17:03:39.000000000 +0100
@@ -0,0 +1,22 @@
+/* PR rtl-optimization/79450 */
+
+unsigned int
+foo (unsigned char x, unsigned long long y)
+{
+ do
+ {
+ x &= !y;
+ x %= 24;
+ }
+ while (x < y);
+ return x + y;
+}
+
+int
+main (void)
+{
+ unsigned int x = foo (1, 0);
+ if (x != 1)
+ __builtin_abort ();
+ return 0;
+}