44 lines
1.0 KiB
Diff
44 lines
1.0 KiB
Diff
|
2017-05-30 Jakub Jelinek <jakub@redhat.com>
|
||
|
|
|
||
|
|
Backported from mainline
|
||
|
|
2016-11-16 Jakub Jelinek <jakub@redhat.com>
|
||
|
|
|
||
|
|
PR rtl-optimization/78378
|
||
|
|
* combine.c (make_extraction): Use force_to_mode for non-{REG,MEM}
|
||
|
|
inner only if pos is 0.
|
||
|
|
|
||
|
|
* gcc.c-torture/execute/pr78378.c: New test.
|
||
|
|
|
||
|
|
--- gcc/combine.c
|
||
|
|
+++ gcc/combine.c
|
||
|
|
@@ -7342,6 +7342,7 @@ make_extraction (machine_mode mode, rtx inner, HOST_WIDE_INT pos,
|
||
|
|
if (tmode != BLKmode
|
||
|
|
&& ((pos_rtx == 0 && (pos % BITS_PER_WORD) == 0
|
||
|
|
&& !MEM_P (inner)
|
||
|
|
+ && (pos == 0 || REG_P (inner))
|
||
|
|
&& (inner_mode == tmode
|
||
|
|
|| !REG_P (inner)
|
||
|
|
|| TRULY_NOOP_TRUNCATION_MODES_P (tmode, inner_mode)
|
||
|
|
--- /dev/null
|
||
|
|
+++ gcc/testsuite/gcc.c-torture/execute/pr78378.c
|
||
|
|
@@ -0,0 +1,18 @@
|
||
|
|
+/* PR rtl-optimization/78378 */
|
||
|
|
+
|
||
|
|
+unsigned long long __attribute__ ((noinline, noclone))
|
||
|
|
+foo (unsigned long long x)
|
||
|
|
+{
|
||
|
|
+ x <<= 41;
|
||
|
|
+ x /= 232;
|
||
|
|
+ return 1 + (unsigned short) x;
|
||
|
|
+}
|
||
|
|
+
|
||
|
|
+int
|
||
|
|
+main ()
|
||
|
|
+{
|
||
|
|
+ unsigned long long x = foo (1);
|
||
|
|
+ if (x != 0x2c24)
|
||
|
|
+ __builtin_abort();
|
||
|
|
+ return 0;
|
||
|
|
+}
|
||
|
|
|