gcc/gcc49-pr61673.patch

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2014-07-02 17:24:13 +00:00
2014-07-02 Jakub Jelinek <jakub@redhat.com>
PR rtl-optimization/61673
* combine.c (simplify_comparison): Test just mode's sign bit
in tmode rather than the sign bit and any bits above it.
* gcc.c-torture/execute/pr61673.c: New test.
--- gcc/combine.c.jj 2014-03-28 20:49:52.892077022 +0100
+++ gcc/combine.c 2014-07-02 16:56:02.260456040 +0200
@@ -11987,7 +11987,7 @@ simplify_comparison (enum rtx_code code,
= (unsigned HOST_WIDE_INT) 1 << (GET_MODE_BITSIZE (mode) - 1);
op0 = simplify_gen_binary (AND, tmode,
gen_lowpart (tmode, op0),
- gen_int_mode (sign, mode));
+ gen_int_mode (sign, tmode));
code = (code == LT) ? NE : EQ;
break;
}
--- gcc/testsuite/gcc.c-torture/execute/pr61673.c.jj 2014-07-02 17:17:01.398908630 +0200
+++ gcc/testsuite/gcc.c-torture/execute/pr61673.c 2014-07-02 17:12:36.000000000 +0200
@@ -0,0 +1,50 @@
+/* PR rtl-optimization/61673 */
+
+char e;
+
+__attribute__((noinline, noclone)) void
+bar (char x)
+{
+ if (x != 0x54 && x != (char) 0x87)
+ __builtin_abort ();
+}
+
+__attribute__((noinline, noclone)) void
+foo (const char *x)
+{
+ char d = x[0];
+ int c = d;
+ if ((c >= 0 && c <= 0x7f) == 0)
+ e = d;
+ bar (d);
+}
+
+__attribute__((noinline, noclone)) void
+baz (const char *x)
+{
+ char d = x[0];
+ int c = d;
+ if ((c >= 0 && c <= 0x7f) == 0)
+ e = d;
+}
+
+int
+main ()
+{
+ const char c[] = { 0x54, 0x87 };
+ e = 0x21;
+ foo (c);
+ if (e != 0x21)
+ __builtin_abort ();
+ foo (c + 1);
+ if (e != 0x87)
+ __builtin_abort ();
+ e = 0x21;
+ baz (c);
+ if (e != 0x21)
+ __builtin_abort ();
+ baz (c + 1);
+ if (e != 0x87)
+ __builtin_abort ();
+ return 0;
+}